CN102998097A - Attenuated total reflection optical measurement platform - Google Patents
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- CN102998097A CN102998097A CN2011102767565A CN201110276756A CN102998097A CN 102998097 A CN102998097 A CN 102998097A CN 2011102767565 A CN2011102767565 A CN 2011102767565A CN 201110276756 A CN201110276756 A CN 201110276756A CN 102998097 A CN102998097 A CN 102998097A
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Abstract
The invention discloses an attenuated total reflection optical measurement platform and relates to the optical measurement technology. The attenuated total reflection optical measurement platform comprises a base, a rotatable arm, a fixed arm, a test component and the like. The test component is an optical waveguide tester, an optical waveguide biochemical sensor tester or a prism total-reflection tester, the fixed arm and a fixed disc form a whole, the rotatable arm is in coaxial and rotatable connection with the fixed disc, the rotatable arm is locked by a fastening screw, the fixed arm and the fixed disc are arranged above the base and are fixedly connected with the base, the rotatable arm is positioned between the base and the fixed disc, an angle measurement rotating disc is arranged above the fixed disc and is coaxially and fixedly connected with the same, the test component is fixed on the angle measurement rotating disc through a supporting rod of the test component, a light source and a detector are fixed on respective supports respectively, the light source support and the detector support are fixed on the fixed arm and the rotatable arm through supporting rods respectively, and light of the light source penetrates through the test component to be received by the detector. The attenuated total reflection optical measurement platform is accurate and adjustable in incident angle, capable of flexibly receiving emergent light and fine in repeatability and universality.
Description
Technical Field
The invention relates to the technical field of optical measurement, in particular to an attenuated total reflection optical measurement platform based on a coupling prism, which is used for testing the waveguide characteristics of an optical waveguide, the characteristics of an optical waveguide sensor, the characteristics of a surface plasma resonance sensor, the thickness and the refractive index of a film sample, the concentration of a solution and the like.
Background
The attenuated total reflection technology is an important optical technology and has wide application in the aspects of optical coupling, optical sensing, spectral analysis, thin film sample testing and the like. When the light is totally reflected on the bottom surface of the prism, an evanescent field can be generated, and the evanescent field can be used for exciting Surface Plasmon Polaritons (SPP), optical waveguide guided modes, fluorescence, Raman signals and SHG signals, and can also be absorbed by molecules, so that the energy of reflected light is attenuated. The prism total reflector is often used as an optical coupler in an optical waveguide device and a Surface Plasmon Resonance (SPR) sensor, and is also an important evanescent wave sensitive device, and is often used in thin film sample analysis, liquid concentration detection, and spectroscopic measurement of adsorbed molecules. The existing prism attenuated total reflection device is relatively specific and has poor universality, and the various purposes can not be considered. Especially, the optical waveguide sensor based on prism coupling usually adopts a separating device to carry out assembly and optical path debugging when in use, thereby being inconvenient to operate, low in system stability and poor in test repeatability. At present, a miniaturized attenuated total reflection measurement system which can be used for testing an optical waveguide sensor is also lacked, and a universal test platform which can be used for optical waveguide testing, SPR testing and prism total reflection measurement is also lacked.
Disclosure of Invention
The invention aims to provide a miniaturized attenuated total reflection optical measuring platform which is simple and practical in structure, convenient to operate and wide in application range, and solves the problems of component separation, complex operation, low precision, poor stability and repeatability and lack of universality of the existing related devices.
In order to achieve the purpose, the technical solution of the invention is as follows:
an attenuated total reflection optical measuring platform comprises a base, a rotating arm, a fixed disc, an angle measuring turntable, a light source bracket, a detector bracket, a testing part and a supporting rod; wherein,
the side surface of the fixed disc is radially and convexly provided with a fixed arm, the fixed disc and the fixed arm are integrated into a whole, a shaft is sleeved in a central through hole of the fixed disc, the upper end of the shaft is fixedly connected with the fixed disc, the lower end of the shaft is supported in a central through hole of the base, the fixed arm and the fixed disc are horizontally arranged above the base and fixedly connected with the base through at least three groups of screws and matched gaskets, and the side surface of the fixed disc is provided with a groove; the upper surface of the outer end of the fixed arm is provided with a groove;
the through hole at the inner end of the rotating arm is sleeved on the shaft, is coaxially and rotatably connected with the fixed disc, is positioned between the base and the fixed disc, and the upper surface at the outer end of the rotating arm is provided with a groove; a screw bracket is convexly arranged between the inner end and the outer end of the rotating arm upwards, a fastening screw is horizontally screwed in the center of the screw bracket, the inner end of the fastening screw is matched with the side groove of the fixed disc, and the rotating arm is locked by extruding the groove through the fastening screw;
the angle measuring rotary table is horizontally arranged above the fixed disc, the base plate of the angle measuring rotary table is coaxially and fixedly connected with the fixed disc, an angle fine adjustment screw rod is radially and convexly arranged on the side surface of the angle measuring rotary table, and a through hole is formed in the center of the rotary table on the angle measuring rotary table;
the groove at the outer end of the fixed arm is orthogonally and fixedly connected with the lower end of a first supporting rod, the upper end of the first supporting rod is rotatably and fixedly connected with a light source bracket, and a light source is fixed on the light source bracket; the inner side wall of the central through hole of the rotary disc on the angle measuring rotary disc is orthogonally and fixedly connected with the circumference of the lower end of a second supporting rod, the upper end of the second supporting rod is fixedly connected with a test part, and the second supporting rod and the shaft share a central axis; the lower end of a third supporting rod is orthogonally and fixedly connected in a groove at the outer end of the rotating arm, the upper end of the third supporting rod is rotatably and fixedly connected with a detector bracket, and a detector is fixed on the detector bracket; the distances from the centers of the light source, the testing component and the detector to the upper surface of the base are the same, the light source, the testing component and the detector are positioned on the same horizontal plane, and light of the light source is coupled and penetrates through the testing component and then is received by the detector.
The test component of the attenuated total reflection optical measurement platform is one of an optical waveguide test device (invention patent, application number: 200910080063.1, application date: 3/18/2009) or an optical waveguide biochemical sensor test device (invention patent, application number: 200910093766.8, application date: 9/28/2009) or a prism total reflection test device.
The prism total reflection testing device of the attenuation total reflection optical measuring platform comprises a chassis, a coupling prism, a light sensing chip, a sample groove fastener and a second supporting rod, wherein the coupling prism is an isosceles right-angle prism, one side surface of the coupling prism is fixedly connected to the upper surface of the chassis, the two right-angle side surfaces respectively face to a light source and a detector on two sides, the bottom surface of the coupling prism is closely attached to the back surface of the light sensing chip, the front surface of the light sensing chip is closely attached to the opening of the sample groove, and the outer side of the bottom of the sample groove is closely attached to the sample groove fastener; the sample groove fastener is fixedly connected to the upper surface of the chassis; the upper end of the second supporting rod is orthogonally and fixedly connected to the lower surface of the chassis, and the axis of the second supporting rod is vertically intersected with a right-angle edge on the bottom surface of the coupling prism;
when the sample groove is used, a little coupling liquid is dripped on the back of the optical sensing chip, then the back of the optical sensing chip is tightly attached to the bottom surface of the coupling prism, then the sample groove is tightly attached to the front of the optical sensing chip, the sample groove and the optical sensing chip are tightly clamped between the coupling prism and the sample groove fastener by adjusting the sample groove fastener, and the contact part of the sample groove and the optical sensing chip is enabled to be watertight.
The coupling prism of the attenuated total reflection optical measuring platform is made of glass or transparent crystal; the optical sensing chip is one of a surface plasma resonance chip or an optical waveguide chip; the sample groove is made of silicon rubber or polytetrafluoroethylene materials; the sample groove fastener comprises a pressing block, a cross beam and a fastening screw, the lower side of the cross beam is fixedly connected to the upper surface of the chassis, the fastening screw is horizontally screwed in the middle of the cross beam, the pressing block is arranged at the inner end of the fastening screw, and the outer end of the fastening screw is a rotating handle; and adjusting the knob to enable the pressing block to tightly attach the sample groove and the optical sensing chip and enable the contact part of the sample groove and the optical sensing chip to be watertight.
The light source of the attenuated total reflection optical measuring platform is one of a small linear polarization laser or a broadband linear polarization parallel light emitter.
The detector of the attenuated total reflection optical measuring platform is one of a photocell, a photosensitive diode, a photomultiplier tube or a fiber spectrometer; when the light source is a small linear polarization laser, the detector is one of a photocell, a photosensitive diode or a photomultiplier; when the light source is a broadband linear polarization parallel light emitter, the detector is a fiber optic spectrometer.
The broadband linear polarization parallel light emitter of the attenuation total reflection optical measurement platform comprises an optical fiber broadband cold light source, an optical fiber collimator, a light source bracket, a linear polarizer and an optical fiber; one end of the optical fiber is fixedly connected with the optical fiber broadband cold light source, the other end of the optical fiber is fixedly connected with the rear end of the optical fiber collimator, the linear polarizer is arranged at the front end of the optical fiber collimator, the optical fiber collimator and the linear polarizer are respectively fixed on the light source bracket, and parallel light emitted by the optical fiber collimator vertically passes through the linear polarizer; the light source support is fixedly connected to the upper end of the first support rod, the lower end of the first support rod is vertically fixed on the fixed arm, and the light source support is provided with a fine adjustment knob, so that the axis of a parallel light beam emitted by the optical fiber collimator is vertically intersected with the axis of the angle measuring rotary disc.
When the attenuated total reflection optical measurement platform is selected to be used as a detector by an optical fiber spectrometer, the following accessories are required: the detector comprises a second optical fiber, a second optical fiber collimator and a detector support, wherein one end of the second optical fiber is fixedly connected with the optical fiber spectrometer, the other end of the second optical fiber is fixedly connected with the second optical fiber collimator, the second optical fiber collimator is fixed on the detector support, the detector support is fixedly connected to the upper end of a third supporting rod, and the lower end of the third supporting rod is vertically fixed on a rotating arm; the light beam output from the test component is received by the second optical fiber collimator and focused on the end face of the second optical fiber, and then is transmitted to the optical fiber spectrometer by the second optical fiber; the fiber spectrometer is connected with the first fiber collimator through a third fiber.
When the broadband linear polarization parallel light emitter of the attenuation total reflection optical measurement platform is matched with the optical fiber spectrometer for use, the optical fiber used by the broadband linear polarization parallel light emitter and the optical fiber used by the optical fiber spectrometer are interconnected through the branched optical fiber structure to form three-branch four-end two-end branched optical fibers, so that a first optical fiber collimator in the broadband linear polarization parallel light emitter is simultaneously connected with the optical fiber cold light source and the optical fiber spectrometer through the branched optical fibers, and the optical fiber spectrometer is simultaneously connected with a second optical fiber collimator serving as an accessory of the optical fiber spectrometer through the branched optical fibers;
when the parallel light beams from the first optical fiber collimator irradiate the coupling prism in the test part, the light beams reflected from the mirror surface of the irradiated coupling prism are returned to the first optical fiber collimator along the original path by adjusting the angle of the angle measuring turntable, and then are transmitted to the optical fiber spectrometer by the branched optical fibers for detection, so that the functions of accurate light path collimation and zero-degree incident angle positioning of the test platform are realized.
The angle measuring turntable of the attenuation total reflection optical measuring platform is a manually operated angle measuring turntable or a motor-driven full-automatic angle measuring turntable.
Bearings are respectively arranged among the fixed disc, the rotating arm and the shaft of the attenuated total reflection optical measuring platform, and the two bearings are superposed; the upper end of the shaft is fixedly connected with the fixed disc in a welding mode, and the lower end of the shaft is provided with a non-disengaging screw and a gasket.
The angle measuring turntable of the attenuation total reflection optical measuring platform is replaced by a support rod sleeve in the application without angle measurement, the lower end surface of the support rod sleeve is fixedly connected to the upper surface of a fixed disc, and the central axis of the support rod sleeve is superposed with the central axis of a shaft; a strut fastening screw is orthogonally arranged on the wall of the strut sleeve, and a second strut is inserted into the strut sleeve and is relatively rotatably connected with the strut sleeve; after the second strut is rotated so that the test part at the upper end of the strut is adjusted to the proper position, the second strut is locked by the strut fastening screw.
The attenuated total reflection optical measurement platform is used for testing the wave guide characteristic of the optical waveguide, the characteristic of the optical waveguide sensor, the characteristic of the surface plasma resonance sensor, the thickness and the refractive index of a film sample and the optical characteristic; wherein,
when the device is used for testing the characteristics of the surface plasma resonance sensor, the testing part uses a prism total reflection testing device;
when the device is used for testing the thickness, the refractive index and the optical characteristics of a film sample, the prism total reflection testing device is used as a testing part, and the film sample to be tested replaces an optical sensing chip.
The measuring platform has the advantages that: a plurality of movable parts and fixed parts are assembled together to form a compact miniaturized universal test system, the defects of difficult operation, low precision, poor stability and repeatability and the like of a separating device during light path adjustment are overcome, the incident angle of the system is accurate and adjustable, emergent light can be flexibly received, and the system is wide in application, convenient to operate, high in test precision and good in repeatability.
Drawings
FIG. 1: the front view of the attenuated total reflection optical measuring platform of the invention;
FIG. 2: the invention relates to an attenuated total reflection optical measurement platform, which is a top view of a main body structure consisting of a base, a fixed disc, a fixed arm and a rotating arm;
FIG. 3: the invention relates to an attenuated total reflection optical measurement platform, which is a front view of a main body structure consisting of a base, a fixed disc, a fixed arm and a rotating arm;
FIG. 4: the invention discloses a schematic diagram of an attenuated total reflection optical measurement platform based on a reflection spectrum measurement mode;
FIG. 5: the resonance spectra of the Surface Plasmon Resonance (SPR) sensors were measured using the measurement platform shown in FIG. 4 under the conditions that the incident angle was 8 ℃ and deionized water and an aqueous lysozyme solution having a concentration of 2. mu.M were injected into the sample cell, respectively.
Detailed Description
Referring to fig. 1, 2, 3 and 4, an attenuated total reflection optical measurement platform of the present invention is shown, in which a base 1, a rotating arm 2, a fixed arm 3, a fixed disk 4, an angle measuring rotary disk 5, a test component 6, a light source 7, a detector 8, an optical fiber 9, a support rod 10, a rotating arm fastening screw 21 and a screw support 22, a shaft 23, a non-slip screw 24, a rolling bearing 25, a screw 31, a support washer 32, a fixed disk sidewall groove 41, an angle fine adjustment screw 51, a coupling prism 61, a light sensing chip 62, a sample groove 63, a press block 64, a beam 65, a sample groove fastening screw 66, a chassis 67, a light source support 71, an optical fiber cold light source 72, optical fiber collimators 73 and 83, a linear polarizer 74, a detector support 81, and an optical fiber spectrometer 82 are provided.
The fixing arm 3 and the fixing disc 4 are integrated, the rotating arm 2 and the fixing disc 4 are coaxially and rotatably connected through a shaft 23, a bearing 25 and a non-disengaging screw 24, the shaft 23 and the fixing disc 4 are fixedly connected in a welding mode and the like, a fastening screw 21 and a screw support 22 are arranged on the rotating arm 2, a groove 41 is carved on the side surface of the fixing disc 4, and the groove 41 is extruded through the fastening screw 21 to lock the rotating arm 2; the fixed arm 3 and the fixed disk 4 are arranged above the base 1 and are fixedly connected with the base 1 through at least three groups of screws 31 and supporting washers 32, and the rotating arm 2 is positioned between the base 1 and the fixed disk 4; an angle measuring turntable 5 is arranged above a fixed disc 4, a chassis of the angle measuring turntable 5 is coaxially and fixedly connected with the fixed disc 4, an angle fine adjustment screw 51 is arranged on the angle measuring turntable 5, a test part 6 is fixed in a through hole formed in the center of the turntable on the angle measuring turntable 5 through a support rod 10, a light source 7 is fixed on a light source support 71, the light source support 71 is fixed on a fixed arm 3 through the support rod 10, a detector 8 is fixed on the detector support 81, the detector support 81 is fixed on a rotating arm 2 through the support rod 10, the distances from the centers of the light source 7, the detector 8 and the test part 6 to the upper surface of the base 1 are the same, fine adjustment knobs are respectively arranged on the light source support 71 and the detector support 81, and light of the light source can be received by the detector 8 after being coupled;
the connection relationship among the fixed disk 4, the fixed arm 3, the rotating arm 2 and the base 1 may be: the rotating arm 2 is rotatably connected with the base 1; the fixed arm 3 is integrated with the fixed disk 4, is arranged above the rotating arm 2, and is fixedly connected with the base 1 by at least three groups of screws 31 and supporting washers 32, and the axis of the fixed disk 4 is coincided with the axis of the connecting shaft of the rotating arm 2.
The test member 6 is an optical waveguide test device (patent application No. 200910080063.1, application date: 3/18/2009), an optical waveguide biochemical sensor test device (patent application No. 200910093766.8, application date: 9/28/2009), or a prism total reflection test device. Among them, the test member itself support 10 corresponds to the primary support 2 in the patent application "optical waveguide test device", and corresponds to the holder 12 in the patent application "optical waveguide biochemical sensor test device".
The prism total reflection testing device comprises a coupling prism 61, a light sensing chip 62, a sample groove 63, a chassis 67, a support rod 10 and a sample groove fastener consisting of a pressing block 64, a cross beam 65 and a fastening screw 66. Wherein, the coupling prism 61 is an isosceles right-angle prism made of high refractive index glass or transparent crystal, and is arranged above the chassis 67, and the triangular bottom surface of the prism 61 is fixedly connected with the chassis 67 by gluing and other methods; the cross beam 65 is arranged above the base plate 67 and fixedly connected with the base plate 67, and the fastening screw 66 passes through an internal threaded hole in the middle of the cross beam 65 to be connected with the pressing block 64 and enables the pressing block 64 to face the mirror surface of the prism 61; the bar 10 is placed under the base plate 67 and is fixed vertically to the base plate 67 such that the axis of the bar 10 perpendicularly intersects a right-angled side of the triangular base of the prism 61. The optical sensing chip 62 is an SPR chip or an optical waveguide chip, and the sample tank 63 is made of silicon rubber or polytetrafluoroethylene material; when the sample groove type optical sensor is used, a little coupling liquid is dripped on the back surface of the optical sensing chip 62, then the back surface of the chip 62 is tightly attached to the mirror surface of the prism 61, then the sample groove 63 is tightly attached to the front surface of the optical sensing chip 62, the sample groove 63 and the optical sensing chip 62 are tightly clamped between the prism 61 and the pressing block 64 through rotating the fastening screw 66, and the sample groove 63 is in sealing contact with the optical sensing chip 62.
The light source 7 is a miniaturized linear polarization laser or a broadband linear polarization parallel light emitter.
The detector 8 is a photocell or photodiode or photomultiplier tube or fiber optic spectrometer. When the light source 7 is a miniaturized linear polarization laser, the detector 8 can be one of a photocell, a photodiode and a photomultiplier; when the light source 7 is a broadband linear polarization parallel light emitter, the detector 8 is a fiber optic spectrometer.
The broadband linear polarization parallel light emitter comprises an optical fiber broadband cold light source 72, an optical fiber collimator 73, a light source support 71, a linear polarizer 74 and an optical fiber 9, wherein one end of the optical fiber is fixedly connected with the optical fiber broadband cold light source 72, the other end of the optical fiber is fixedly connected with the optical fiber collimator 73, the optical fiber collimator 73 is fixed on the light source support 71, the linear polarizer 74 is arranged at the front end of the optical fiber collimator 73 and fixedly connected with the light source support 71, parallel light emitted from the optical fiber collimator 73 vertically penetrates through the polarizer, the light source support 71 is vertically fixed on the fixing arm 3 through a support rod 10, and a fine adjustment knob is arranged on the light source support 71, so that the axis of the parallel light beam emitted from the optical fiber collimator 73 is vertically intersected with the axis of the angle measuring turntable 5.
When the detector 8 is a fiber optic spectrometer 82, the required accessories include: an optical fiber 9 and a fiber collimator 83 and a detector support 81. One end of the optical fiber 9 is fixedly connected with the optical fiber spectrometer 82, the other end of the optical fiber 9 is fixedly connected with the optical fiber collimator 83, the optical fiber collimator 83 is fixed on the detector support 81, the detector support 81 is vertically fixed on the rotating arm 2 through the supporting rod 10, the fine adjustment knob is arranged on the detector support 81, and a light beam output from the test component 6 can be received by the optical fiber collimator 83 and focused on the end face of the optical fiber 9 and then transmitted to the optical fiber spectrometer 82 through the optical fiber 9.
The optical fiber used by the broadband linear polarization parallel light emitter and the optical fiber used by the optical fiber spectrometer 82 are interconnected through a bifurcated optical fiber structure to form three-branch four-end two-end bifurcated optical fiber 9, so that the optical fiber collimator 73 of the broadband linear polarization parallel light emitter is simultaneously connected with the optical fiber cold light source 72 and the optical fiber spectrometer 82 through the bifurcated optical fiber, and the optical fiber spectrometer 82 is simultaneously connected with the optical fiber collimator 83 serving as an accessory through the bifurcated optical fiber.
When the incident parallel light beam irradiates the coupling prism 61 of the test part 6, the light beam reflected from the mirror surface of the prism 61 can be returned along the original path by adjusting the angle measuring turntable 5, received by the optical fiber collimator 73 and transmitted to the optical fiber spectrometer 82 by the branched optical fiber 9 for detection, thereby realizing the functions of accurate light path collimation and zero-degree incident angle positioning of the test platform.
The angle measuring rotary disc 5 can be a manually operated angle measuring rotary disc or a full-automatic angle measuring rotary disc driven by a motor.
The angle measuring rotary disc 5 can be replaced by a supporting rod sleeve under the condition that angle measurement is not needed, the supporting rod sleeve is arranged above the fixed disc 4 and is coaxially and fixedly connected with the fixed disc 4, a fastening screw is arranged on the wall of the supporting rod sleeve, the testing component 6 is rotatably connected with the supporting rod sleeve through a supporting rod of the testing component 6, and the testing component 6 is locked by the fastening screw after being adjusted to a proper position through rotating the supporting rod.
When the attenuated total reflection optical measurement platform is used for testing and analyzing the wave guiding characteristics of the optical waveguide, the test component 6 adopts an optical waveguide test device (invention patent, application number: 200910080063.1, application date: 2009, 3/18); when the test component is used for testing and analyzing the characteristics of the optical waveguide sensor, the test component is an optical waveguide biochemical sensor test device (invention patent, application number: 200910093766.8, application date: 2009, 9 and 28); when the test component is used for testing and analyzing the SPR sensor characteristic or the waveguide mode spectrum characteristic, the test component 6 selects a prism total reflection test device; when the device is used for testing and analyzing the thickness, the refractive index and the optical characteristics of the film sample, the testing component 6 adopts a prism total reflection testing device, and the film sample to be tested replaces an optical sensing chip.
Example (b):
the base 1, the rotating arm 2, the fixed arm 3 and the fixed disk 4 are made of stainless steel, the size of the base 1 is 195mm multiplied by 100mm multiplied by 12mm, the size of the rotating arm 2 is 80mm multiplied by 25mm multiplied by 12mm, the size of the fixed arm 3 is 45mm multiplied by 20mm multiplied by 12mm, the diameter of the fixed disk 4 is 90mm, and the thickness of the fixed disk is 25 mm; the angle measuring turntable 5 is a commercial manual rotating table with the diameter of 80mm and is provided with an angle fine adjustment screw 51; the optical fiber broadband cold light source 72 is a commercially available tungsten halogen lamp optical fiber cold light source, the optical fiber spectrometer 82 is a commercially available CCD (charge coupled device) optical fiber spectrometer, the spectral test range is 300 nm-1000 nm, and the spectral resolution is 1 nm. The two-end branched optical fiber is a quartz multimode optical fiber, the diameter of the optical fiber core is 600 mu m, and each end of the optical fiber is provided with an SMA optical fiber adapter.
The test component 6 adopts a prism total reflection test device, the device chassis 67, the press block 64, the cross beam 65 and the fastening screw 66 are made of hard aluminum, the coupling prism 61 is made of high-refractive-index glass, the side length of the triangular bottom surface of the prism is 25mm multiplied by 35.36mm, and the height of the prism is 25 mm. The sensing chip 62 is an SPR chip and is formed by sputtering a 45 nm-thick gold film on the surface of a BK7 glass substrate, the size of the chip is 25mm multiplied by 20mm multiplied by 1mm, the size of the sample groove 63 is made of a silicon rubber block, the size of the sample groove is 25mm multiplied by 5mm, and the optical coupling liquid is methylene iodide.
The optical fiber cold light source 72 of the halogen tungsten lamp is started, light emitted from the optical fiber is transmitted through the optical fiber collimator 73 and the polarizer 74 to become linear polarization parallel light beams, the light beams irradiate the mirror surface of the coupling prism 61 and are partially reflected and partially refracted, the angle measuring turntable 5 is adjusted to enable the light beams reflected by the mirror surface of the prism 61 to return along the original path and be received by the optical fiber collimator 73, then the light beams are transmitted to the optical fiber spectrometer 82 through the branched optical fiber 9, when the spectral intensity detected by the optical fiber spectrometer reaches the maximum, the angle measuring turntable 5 is stopped to be adjusted, the degree specified by the angle measuring turntable is read, and the incident angle corresponding to the degree is zero. After that, the angle dial 5 is adjusted again so that the incident angle is set to 8 °. The rotating arm 2 is then rotated and the detector support 81 is trimmed so that the attenuated total reflected beam emerging from the coupling prism 61 is received by the fiber collimator 83 and transmitted by the bifurcated fiber 9 to the fiber spectrometer 82. When the spectral intensity detected by the fiber spectrometer 82 reaches the maximum, the rotating arm 2 is locked by the fastening screw 21.
Deionized water is injected into the sample tank 63 by a pipette and the reflected light intensity spectrum detected by the fiber optic spectrometer 82 is recorded. The deionized water in the sample tank 63 was then replaced with an aqueous lysozyme solution at a concentration of 2. mu.M, while the reflected light intensity spectrum was continuously recorded at 1-second intervals. When the spectra are observed to no longer vary with time, recording is stopped. The sample well fasteners are loosened after the solution is removed from the sample well 63, the SPR chip is replaced with a new one, and the sample well 63 is removed for cleaning for the next use. FIG. 5 shows resonance spectra of SPR sensors measured under conditions where the sample tank was filled with deionized water and an aqueous lysozyme solution at a concentration of 2. mu.M at an incident angle of 8 ℃. Each spectrum includes a trough, and the wavelength corresponding to the trough is the SPP resonance wavelength. The adsorption of lysozyme on the surface of the SPR chip enables the SPP resonance wavelength to generate red shift relative to the SPP resonance wavelength corresponding to the deionized water.
Claims (13)
1. An attenuated total reflection optical measuring platform comprises a base, a rotating arm, a fixed disc, an angle measuring turntable, a light source bracket, a detector bracket, a testing part and a supporting rod; it is characterized in that the preparation method is characterized in that,
the side surface of the fixed disc is radially and convexly provided with a fixed arm, the fixed disc and the fixed arm are integrated into a whole, a shaft is sleeved in a central through hole of the fixed disc, the upper end of the shaft is fixedly connected with the fixed disc, the lower end of the shaft is supported in a central through hole of the base, the fixed arm and the fixed disc are horizontally arranged above the base and fixedly connected with the base through at least three groups of screws and matched gaskets, and the side surface of the fixed disc is provided with a groove; the upper surface of the outer end of the fixed arm is provided with a groove;
the through hole at the inner end of the rotating arm is sleeved on the shaft, is coaxially and rotatably connected with the fixed disc, is positioned between the base and the fixed disc, and the upper surface at the outer end of the rotating arm is provided with a groove; a screw bracket is convexly arranged between the inner end and the outer end of the rotating arm upwards, a fastening screw is horizontally screwed in the center of the screw bracket, the inner end of the fastening screw is matched with the side groove of the fixed disc, and the rotating arm is locked by extruding the groove through the fastening screw;
the angle measuring rotary table is horizontally arranged above the fixed disc, the base plate of the angle measuring rotary table is coaxially and fixedly connected with the fixed disc, an angle fine adjustment screw rod is radially and convexly arranged on the side surface of the angle measuring rotary table, and a through hole is formed in the center of the rotary table on the angle measuring rotary table;
the groove at the outer end of the fixed arm is orthogonally and fixedly connected with the lower end of a first supporting rod, the upper end of the first supporting rod is rotatably and fixedly connected with a light source bracket, and a light source is fixed on the light source bracket; the inner side wall of the central through hole of the rotary disc on the angle measuring rotary disc is orthogonally and fixedly connected with the circumference of the lower end of a second supporting rod, the upper end of the second supporting rod is fixedly connected with a test part, and the second supporting rod and the shaft share a central axis; the lower end of a third supporting rod is orthogonally and fixedly connected in a groove at the outer end of the rotating arm, the upper end of the third supporting rod is rotatably and fixedly connected with a detector bracket, and a detector is fixed on the detector bracket; the distances from the centers of the light source, the testing component and the detector to the upper surface of the base are the same, the light source, the testing component and the detector are positioned on the same horizontal plane, and light of the light source is coupled and penetrates through the testing component and then is received by the detector.
2. The attenuated total reflection optical measurement platform of claim 1, wherein said test component is one of an optical waveguide test device, an optical waveguide biochemical sensor test device, or a prism total reflection test device.
3. The attenuated total reflection optical measurement platform of claim 2, wherein the prism total reflection testing device comprises a chassis, a coupling prism, a photo-sensing chip, a sample slot fastener, and a second supporting rod, wherein the coupling prism is an isosceles right-angle prism, one side surface of the coupling prism is fixedly connected to the upper surface of the chassis, the two right-angle side surfaces respectively face to the light source and the detector on two sides, the bottom surface of the coupling prism is tightly attached to the back surface of the photo-sensing chip, the front surface of the photo-sensing chip is tightly attached to the opening of the sample slot, and the outer side of the bottom surface of the sample slot is tightly attached to the sample slot fastener; the sample groove fastener is fixedly connected to the upper surface of the chassis; the upper end of the second supporting rod is orthogonally and fixedly connected to the lower surface of the chassis, and the axis of the second supporting rod is vertically intersected with a right-angle edge on the bottom surface of the coupling prism;
when the sample groove is used, a little coupling liquid is dripped on the back of the optical sensing chip, then the back of the optical sensing chip is tightly attached to the bottom surface of the coupling prism, then the sample groove is tightly attached to the front of the optical sensing chip, the sample groove and the optical sensing chip are tightly clamped between the coupling prism and the sample groove fastener by adjusting the sample groove fastener, and the contact part of the sample groove and the optical sensing chip is enabled to be watertight.
4. The attenuated total reflection optical measurement platform of claim 3, wherein said coupling prism is made of glass or transparent crystal; the optical sensing chip is one of a surface plasma resonance chip or an optical waveguide chip; the sample groove is made of silicon rubber or polytetrafluoroethylene materials; the sample groove fastener comprises a pressing block, a cross beam and a fastening screw, the lower side of the cross beam is fixedly connected to the upper surface of the chassis, the fastening screw is horizontally screwed in the middle of the cross beam, the pressing block is arranged at the inner end of the fastening screw, and the outer end of the fastening screw is a rotating handle; and adjusting the knob to enable the pressing block to tightly attach the sample groove and the optical sensing chip and enable the contact part of the sample groove and the optical sensing chip to be watertight.
5. The attenuated total reflection optical measurement platform of claim 1, wherein said light source is one of a compact linearly polarized laser or a broadband linearly polarized parallel light emitter.
6. The attenuated total reflection optical measurement platform of claims 1 and 5, wherein said detector is one of a photocell, a photodiode, a photomultiplier tube, or a fiber optic spectrometer; when the light source is a small linear polarization laser, the detector is one of a photocell, a photosensitive diode or a photomultiplier; when the light source is a broadband linear polarization parallel light emitter, the detector is a fiber optic spectrometer.
7. The attenuated total reflection optical measurement platform of claim 1 or 5, wherein said broadband linearly polarized parallel light emitter comprises a fiber broadband cold light source, a fiber collimator, a light source holder, a linear polarizer, and an optical fiber; one end of the optical fiber is fixedly connected with the optical fiber broadband cold light source, the other end of the optical fiber is fixedly connected with the rear end of the optical fiber collimator, the linear polarizer is arranged at the front end of the optical fiber collimator, the optical fiber collimator and the linear polarizer are respectively fixed on the light source bracket, and parallel light emitted by the optical fiber collimator vertically passes through the linear polarizer; the light source support is fixedly connected to the upper end of the first support rod, the lower end of the first support rod is vertically fixed on the fixed arm, and the light source support is provided with a fine adjustment knob, so that the axis of a parallel light beam emitted by the optical fiber collimator is vertically intersected with the axis of the angle measuring rotary disc.
8. The attenuated total reflectance optical measurement platform of claim 1 or 6, wherein when a fiber optic spectrometer is selected as the detector, the following accessories are required: the detector comprises a second optical fiber, a second optical fiber collimator and a detector support, wherein one end of the second optical fiber is fixedly connected with the optical fiber spectrometer, the other end of the second optical fiber is fixedly connected with the second optical fiber collimator, the second optical fiber collimator is fixed on the detector support, the detector support is fixedly connected to the upper end of a third supporting rod, and the lower end of the third supporting rod is vertically fixed on a rotating arm; the light beam output from the test component is received by the second optical fiber collimator and focused on the end face of the second optical fiber, and then is transmitted to the optical fiber spectrometer by the second optical fiber; the fiber spectrometer is connected with the first fiber collimator through a third fiber.
9. The attenuated total reflection optical measurement platform of claim 6, wherein when the broadband linear polarized parallel light emitter is used in conjunction with an optical fiber spectrometer, the optical fiber used by the broadband linear polarized parallel light emitter and the optical fiber used by the optical fiber spectrometer are interconnected by a bifurcated optical fiber structure to form three-branched two-end bifurcated optical fibers with four ends, so that a first optical fiber collimator in the broadband linear polarized parallel light emitter is simultaneously connected with the optical fiber cold light source and the optical fiber spectrometer through the bifurcated optical fiber, and the optical fiber spectrometer is simultaneously connected with a second optical fiber collimator serving as an accessory of the optical fiber spectrometer through the bifurcated optical fiber;
when the parallel light beams from the first optical fiber collimator irradiate the coupling prism in the test part, the light beams reflected from the mirror surface of the irradiated coupling prism are returned to the first optical fiber collimator along the original path by adjusting the angle of the angle measuring turntable, and then are transmitted to the optical fiber spectrometer by the branched optical fibers for detection, so that the functions of accurate light path collimation and zero-degree incident angle positioning of the test platform are realized.
10. The attenuated total reflection optical measurement platform of claim 1 or 9, wherein said angle-measuring rotary table is a manually operated angle-measuring rotary table or a motor-driven fully automatic angle-measuring rotary table.
11. The attenuated total reflection optical measurement platform of claim 1, wherein bearings are respectively disposed between said fixed disk, said rotatable arm and said shaft, and said bearings are stacked; the upper end of the shaft is fixedly connected with the fixed disc in a welding mode, and the lower end of the shaft is provided with a non-disengaging screw and a gasket.
12. The attenuated total reflection optical measurement platform of claim 1, wherein said angle measurement rotary table, in applications where angle measurement is not required, is replaced with a support rod sleeve, the lower end face of the support rod sleeve is fixedly connected to the upper surface of the fixed disc, and the central axis of the support rod sleeve coincides with the central axis of the shaft; a strut fastening screw is orthogonally arranged on the wall of the strut sleeve, and a second strut is inserted into the strut sleeve and is relatively rotatably connected with the strut sleeve; after the second strut is rotated so that the test part at the upper end of the strut is adjusted to the proper position, the second strut is locked by the strut fastening screw.
13. The attenuated total reflection optical measurement platform of claim 1, for testing optical waveguide guiding characteristics, optical waveguide sensor characteristics, surface plasmon resonance sensor characteristics, film sample thickness and refractive index and optical characteristics; when the device is used for testing the characteristics of the surface plasma resonance sensor, the testing component uses a prism total reflection testing device;
when the device is used for testing the thickness, the refractive index and the optical characteristics of a film sample, the prism total reflection testing device is used as a testing part, and the film sample to be tested replaces an optical sensing chip.
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