CN102998097A - Attenuated total reflection optical measurement platform - Google Patents

Abstract

The invention discloses an attenuated total reflection optical measurement platform, which relates to optical measurement technology, and includes a base, a rotating arm, a fixed arm, a test component, etc.; the test component is an optical waveguide test device or an optical waveguide biochemical sensor test device or a prism total reflection test device. The fixed arm is integrated with the fixed disc, the rotating arm is coaxially connected with the fixed disc, and the rotating arm is locked by fastening screws; the fixed arm and the fixed disc are placed above the base and fixedly connected with the base, and the rotating arm is located between the base and the fixed disc. Between the discs; the angle measuring turntable is placed above the fixed disc, and is coaxially fixedly connected with the fixed disc; the test component is fixed on the angle measuring turntable through its own pole, and the light source and detector are respectively fixed on their respective brackets, and the light source bracket and the detector bracket are respectively fixed on the fixed arm and the rotating arm through the support rod, and the light from the light source passes through the test component and is received by the detector. The device of the invention has an accurate and adjustable incident angle, can flexibly receive outgoing light, and has good repeatability and versatility.

Description

Attenuated total reflection optical measurement platform

technical field

The invention relates to the field of optical measurement technology, and is an attenuated total reflection optical measurement platform based on a coupling prism, which is used to test the characteristics of optical waveguide guide waves, optical waveguide sensor characteristics, surface plasmon resonance sensor characteristics, film sample thickness and refractive index , solution concentration, etc.

Background technique

Attenuated total reflection technology is an important optical technology, which has a wide range of applications in many aspects such as optical coupling, optical sensing, spectral analysis, and thin film sample testing. When the light is totally reflected at the bottom of the prism, an evanescent field will be generated. This evanescent field can be used to excite surface plasmon polaritons (SPP), optical waveguide modes, fluorescence, Raman signals, and SHG signals. It can also be absorbed by molecules, making the reflection Light energy is attenuated. The prism total reflector is often used as an optical coupler in optical waveguide devices and surface plasmon resonance (SPR) sensors, and the prism total reflector itself is also an important evanescent wave sensitive device, which is often used for thin film sample analysis, Liquid concentration detection and spectral testing of adsorbed molecules. Existing prism attenuated total reflection devices are relatively specific, have poor versatility, and cannot take into account the above-mentioned various purposes. In particular, optical waveguide sensors based on prism coupling often use separate devices for assembly and optical path debugging, which is not easy to operate, the system stability is not high, and the test repeatability is poor. At present, there is still a lack of a miniaturized attenuated total reflection measurement system that can be used to test optical waveguide sensors, and there is still a lack of a universal test platform that can be used for optical waveguide testing, SPR testing, and prism total reflection measurement.

Contents of the invention

The purpose of the present invention is to provide a miniaturized attenuated total reflection optical measurement platform, which has simple and practical structure, convenient operation and wide application, and solves the problems of device separation, complicated operation, low precision, poor stability and repeatability of existing related devices , Lack of versatility.

For realizing the above object, technical solution of the present invention is:

An attenuated total reflection optical measurement platform, including a base, a rotating arm, a fixed arm, a fixed disc, an angle measuring turntable, a light source, a light source bracket, a detector, a detector bracket, a test component and a support rod; wherein,

A fixed arm is radially protruded from the side of the fixed disc. The fixed disc and the fixed arm are integrated. The center through hole of the fixed disc is provided with a shaft. Among them, the fixed arm and the fixed disc are placed horizontally above the base, and are fixedly connected to the base by at least three sets of screws and supporting washers, the side of the fixed disc is provided with a groove; the upper surface of the outer end of the fixed arm has a groove;

The through hole at the inner end of the rotating arm is sleeved on the shaft, and is coaxially connected with the fixed disc. It is located between the base and the fixed disc. There is a groove on the upper surface of the outer end of the rotating arm; screws are protruding upwards between the inner and outer ends of the rotating arm. Bracket, the center of the screw bracket is horizontally screwed with a fastening screw, and the inner end of the fastening screw is adapted to the side groove of the fixed disc, and the rotating arm is locked by squeezing the groove with the fastening screw;

The angle measuring turntable is placed horizontally above the fixed disc, the chassis of the angle measuring turntable is coaxially fixedly connected with the fixed disc, the side of the angle measuring turntable is radially protruded with an angle fine-tuning screw, and the center of the turntable on the angle measuring turntable has a through hole;

The lower end of the first support rod is fixed orthogonally in the groove at the outer end of the fixed arm, and the upper end of the first support rod is rotatably fixed to the light source bracket, and the light source is fixed on the light source support; The circumference of the lower end of the second support rod is cross-fixed, and the upper end of the second support rod is fixed to the test part. The second support rod and the shaft share a central axis; The upper ends of the three rods are rotatably fixed to the detector bracket, and the detector is fixed on the detector bracket; the distance from the center of the light source, test component and detector to the upper surface of the base is the same, and the light source, test component and detector are on the same horizontal plane. Light from the source is coupled through the test part and received by the detector.

The attenuated total reflection optical measurement platform, the test components, is an optical waveguide testing device (invention patent, application number: 200910080063.1, application date: March 18, 2009) or an optical waveguide biochemical sensor testing device (invention patent , application number: 200910093766.8, application date: September 28, 2009) or one of the prism total reflection test devices.

The attenuated total reflection optical measurement platform, the prism total reflection test device includes a chassis, a coupling prism, an optical sensor chip, a sample slot, a sample slot fastener, and a second pole, wherein the coupling prism is, etc. Waist right-angle prism, one side of the coupling prism is fixed on the upper surface of the chassis, and the two right-angle sides face the light sources and detectors on both sides respectively. It is closely connected with the opening of the sample tank, and the outer side of the bottom of the sample tank is closely connected with the fasteners of the sample tank; the fasteners of the sample tank are fixed on the upper surface of the chassis; the upper end of the second pole is orthogonally fixed on the lower surface of the chassis, and the second The axis of the strut is vertically intersected with the right-angled side of the bottom surface of the coupling prism;

When in use, put a little coupling liquid on the back of the light sensor chip, then put the back of the light sensor chip close to the bottom of the coupling prism, and then put the sample groove close to the front of the light sensor chip, and adjust the fasteners of the sample groove to make the sample The groove and the light sensing chip are tightly clamped between the coupling prism and the sample groove fastener, and the contact between the sample groove and the light sensing chip is watertight.

In the attenuated total reflection optical measurement platform, the coupling prism is made of glass or light-transmitting crystal; the optical sensor chip is one of a surface plasmon resonance chip or an optical waveguide chip; the sample slot is made of silicon rubber or polytetrafluoroethylene; the fasteners of the sample tank include a pressure block, a beam and a fastening screw. The pressing block has a rotary handle at the outer end; adjust the rotary handle so that the pressing block closely connects the sample tank and the light sensor chip, and makes the contact between the sample tank and the light sensor chip leak-free.

In the attenuated total reflection optical measurement platform, the light source is one of a small linearly polarized laser or a broadband linearly polarized parallel light emitter.

In the attenuated total reflection optical measurement platform, the detector is one of photocell, photodiode, photomultiplier tube or fiber optic spectrometer; when the light source is a small linearly polarized laser, the detector uses a photocell, photodiode or photomultiplier One of the tubes; when the light source is a broadband linearly polarized parallel light emitter, the detector uses a fiber optic spectrometer.

Described attenuated total reflection optical measurement platform, its described broadband linearly polarized parallel light emitter, comprises a fiber optic broadband cold light source, a fiber optic collimator, light source support, a linear polarizer, and an optical fiber; The broadband cold light source is fixedly connected, and the other end is fixedly connected to the rear end of the fiber collimator. The linear polarizer is placed at the front end of the fiber collimator. The emitted parallel light passes through the linear polarizer vertically; the light source bracket is fixed on the upper end of the first support rod, and the lower end of the first support rod is vertically fixed on the fixed arm. The axis of the beam is perpendicular to the axis of the goniometer turntable.

The attenuated total reflection optical measurement platform, when the optical fiber spectrometer is selected as the detector, the following accessories are required: a second optical fiber, a second optical fiber collimator, a detector bracket, one end of the second optical fiber is fixedly connected to the optical fiber spectrometer, and the other One end is fixedly connected with the second fiber collimator, the second fiber collimator is fixed on the detector bracket, the detector bracket is fixed on the upper end of the third rod, and the lower end of the third rod is vertically fixed on the rotating arm; from the test The light beam output by the component is received by the second fiber collimator and focused to the end face of the second fiber, and then transmitted to the fiber optic spectrometer by the second fiber; the fiber spectrometer and the first fiber collimator are connected by a third fiber.

In the attenuated total reflection optical measurement platform, when the broadband linearly polarized parallel light emitter is used in conjunction with the fiber optic spectrometer, the optical fiber used by the broadband linearly polarized parallel light emitter and the optical fiber used by the fiber optic spectrometer are interconnected through a bifurcated optical fiber structure Three forked fibers with four ends are formed, so that the first fiber collimator in the broadband linearly polarized parallel light transmitter is connected to the fiber cold light source and the fiber optic spectrometer at the same time through the bifurcated fiber, and the fiber spectrometer is simultaneously connected to the fiber optic spectrometer through the bifurcated fiber. Second fiber collimator connection for fiber optic spectrometer accessories;

When the parallel beam from the first fiber collimator irradiates the coupling prism in the test component, the beam reflected from the mirror surface of the irradiated coupling prism returns to the first optical fiber along the original path by adjusting the angle of the goniometer turntable The collimator is then transmitted to the fiber optic spectrometer by the bifurcated optical fiber for detection, thereby realizing the precise optical path collimation and zero-degree incident angle positioning functions of the test platform.

In the attenuated total reflection optical measurement platform, the angle measuring turntable is a manually operated angle measuring turntable, or a fully automatic angle measuring turntable driven by a motor.

In the attenuated total reflection optical measurement platform, bearings are respectively arranged between the fixed disc, the rotating arm and the shaft, and the two bearings are stacked; the upper end of the shaft is fixedly connected to the fixed disc by welding, and the shaft The lower end is provided with non-extracting screws and gaskets.

In the attenuated total reflection optical measurement platform, the angle measurement turntable is replaced by a pole sleeve in the application that does not require angle measurement, and the lower end surface of the pole sleeve is fixed on the upper surface of the fixed disc. , the central axis of the pole sleeve coincides with the central axis of the shaft; the wall of the pole sleeve is orthogonally provided with a pole fastening screw, the second pole is inserted into the pole sleeve, and is connected with the pole sleeve for relative rotation; After rotating the second pole so that the test component at the upper end of the pole is adjusted to an appropriate position, the second pole is locked by the pole fastening screw.

The attenuated total reflection optical measurement platform is used for testing optical waveguide guide wave characteristics, optical waveguide sensor characteristics, surface plasmon resonance sensor characteristics, thin film sample thickness and refractive index and optical characteristics; wherein,

When used for the surface plasmon resonance sensor characteristic test, the prism total reflection test device is used for the test part;

When used to test the thickness, refractive index and optical properties of a film sample, the test component uses a prism total reflection test device, and the film sample to be tested replaces the light sensor chip.

The advantage of the measurement platform of the present invention is that a plurality of movable parts and fixed parts are assembled together to form a compact and miniaturized general-purpose test system, which avoids the difficulty in operation, low precision, stability and repeatability of the separation device when adjusting the optical path. The system has the disadvantages of poor performance, the incident angle of the system can be adjusted accurately, and the outgoing light can be flexibly received. It has wide application, convenient operation, high test accuracy and good repeatability.

Description of drawings

Fig. 1: the front view of a kind of attenuated total reflection optical measurement platform of the present invention;

Figure 2: A top view of the main structure of an attenuated total reflection optical measurement platform of the present invention consisting of a base, a fixed disc, a fixed arm, and a rotating arm;

Figure 3: A front view of the main structure of an attenuated total reflection optical measurement platform of the present invention consisting of a base, a fixed disc, a fixed arm, and a rotating arm;

Figure 4: A schematic diagram of an attenuated total reflection optical measurement platform based on the reflection spectrum measurement mode of the present invention;

Figure 5: Using the measurement platform shown in Figure 4, the resonance of the surface plasmon resonance (SPR) sensor was measured under the conditions of an incident angle of 8°, deionized water and a lysozyme aqueous solution with a concentration of 2 μM in the sample tank. Spectrum.

Detailed ways

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, it is an attenuated total reflection optical measurement platform of the present invention, in the figure, the base 1, the rotating arm 2, the fixed arm 3, the fixed disc 4, and the angle measuring turntable 5. Test component 6, light source 7, detector 8, optical fiber 9, support rod 10, rotating arm fastening screw 21 and screw bracket 22, shaft 23, screw 24, rolling bearing 25, screw 31, support washer 32, fixing Disc side wall groove 41, angle fine-tuning screw 51, coupling prism 61, optical sensor chip 62, sample tank 63, pressing block 64, beam 65, sample tank fastening screw 66, chassis 67, light source bracket 71, optical fiber broadband Cold light source 72 , fiber collimators 73 and 83 , linear polarizer 74 , detector bracket 81 , and fiber optic spectrometer 82 .

The fixed arm 3 and the fixed disc 4 are integrated, the rotating arm 2 and the fixed disc 4 are coaxially rotatably connected by the shaft 23, the bearing 25 and the screw 24 which does not come out, and the shaft 23 and the fixed disc 4 are fixedly connected by means of welding, etc. The arm 2 is provided with a fastening screw 21 and a screw bracket 22, and a groove 41 is carved on the side of the fixed disk 4, and the rotating arm 2 can be locked by squeezing the groove 41 through the fastening screw 21; the fixed arm 3 and the fixed disk 4 are placed above the base 1, and fixedly connected to the base 1 by at least three sets of screws 31 and support washers 32, and the rotating arm 2 is located between the base 1 and the fixed disc 4; the angle measuring turntable 5 is placed above the fixed disc 4, The chassis of the angle-measuring turntable 5 is coaxially fixedly connected with the fixed disk 4, the angle-measuring turntable 5 is provided with an angle fine-tuning screw 51, and the test component 6 is fixed in the through hole provided in the center of the turntable on the angle-measuring turntable 5 through its own support rod 10 , the light source 7 is fixed on the light source bracket 71, and then the light source bracket 71 is fixed on the fixed arm 3 through the pole 10, the detector 8 is fixed on the detector bracket 81, and the detector bracket 81 is fixed to the rotation through the pole 10 On the arm 2, the distance from the center of the light source 7, the detector 8, and the center of the test component 6 to the upper surface of the base 1 is the same, the light source bracket 71 and the detector bracket 81 are respectively provided with fine-tuning knobs, and the light from the light source is coupled through the test component 6. Can be received by detector 8;

The connection relation of fixed disk 4, fixed arm 3, rotating arm 2, base 1 also can be: rotating arm 2 is connected with base 1 in rotation; At least three sets of screws 31 and support washers 32 are fixedly connected to the base 1 , and the axis of the fixed disk 4 coincides with the axis of the connecting shaft of the rotating arm 2 .

The test component 6 is an optical waveguide testing device (invention patent, application number: 200910080063.1, application date: March 18, 2009), or an optical waveguide biochemical sensor testing device (invention patent, application number: 200910093766.8, application date: September 2009 28th), or prism total reflection test device. Among them, the support rod 10 of the test component itself corresponds to the main support rod 2 in the patent application "Optical Waveguide Testing Device", and corresponds to the bracket 12 in the patent application "Optical Waveguide Biochemical Sensor Testing Device".

The prism total reflection testing device includes a coupling prism 61 , an optical sensor chip 62 , a sample slot 63 , a chassis 67 , a pole 10 , and a sample slot fastener composed of a pressing block 64 , a beam 65 and a fastening screw 66 . Wherein, the coupling prism 61 is an isosceles rectangular prism made of high-refractive index glass or light-transmitting crystal, placed above the chassis 67 and fixedly connected to the chassis 67 by means of gluing or the like; the beam 65 is placed on the chassis 67 above, fixedly connected with the chassis 67, the fastening screw 66 passes through the inner threaded hole in the middle of the beam 65 and is connected with the briquetting block 64, and makes the briquetting block 64 face the mirror surface of the prism 61; the pole 10 is placed below the chassis 67 and is vertically fixed on the On the chassis 67 , the axis of the strut 10 is perpendicular to the right angle side of the triangular bottom surface of the prism 61 . The light sensor chip 62 is an SPR chip or an optical waveguide chip, and the sample groove 63 is made of silicon rubber or polytetrafluoroethylene; Paste the mirror surface of the prism 61, and then the sample groove 63 is close to the front of the light sensor chip 62, and the sample groove 63 and the light sensor chip 62 are tightly clamped between the prism 61 and the pressing block 64 by rotating the fastening screw 66, and the sample groove 63 is in sealing contact with the light sensor chip 62 .

The light source 7 is a miniaturized linearly polarized laser or a broadband linearly polarized parallel light emitter.

The detector 8 is a photocell or a photosensitive diode or a photomultiplier tube or a fiber optic spectrometer. When the light source 7 is a miniaturized linearly polarized laser, the detector 8 can be selected from one of photocells, photosensitive diodes and photomultiplier tubes; when the light source 7 is a broadband linearly polarized parallel light transmitter, the detector 8 can be selected from a fiber optic spectrometer.

The broadband linearly polarized parallel light transmitter includes a fiber broadband cold light source 72, a fiber collimator 73, a light source support 71, a linear polarizer 74, and an optical fiber 9, one end of the fiber is fixedly connected to the fiber broadband cold light source 72, and the other One end 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 placed on the front end of the optical fiber collimator 73, is fixedly connected with the light source support 71, and makes the optical fiber collimator 73 The emitted parallel light passes through the polarizer vertically, and the light source bracket 71 is vertically fixed on the fixed arm 3 through the support rod 10. The light source bracket 71 is provided with a fine-tuning knob, so that the axis of the parallel beam emitted from the fiber collimator 73 is aligned with the angle measuring turntable. 5 axes intersect perpendicularly.

When the detector 8 is a fiber optic spectrometer 82 , the required accessories include: an optical fiber 9 , a fiber collimator 83 and a detector bracket 81 . One end of the optical fiber 9 is fixedly connected to the fiber optic spectrometer 82, and the other end is fixedly connected to the fiber collimator 83, the fiber collimator 83 is fixed to the detector bracket 81, and the detector bracket 81 is vertically fixed to the rotating arm 2 through the support rod 10 , the detector bracket 81 is provided with a fine-tuning knob, and the light beam output from the test component 6 can be received by the fiber collimator 83 and focused onto the end face of the fiber 9 , and then transmitted to the fiber optic spectrometer 82 by the fiber 9 .

The optical fiber used by the broadband linearly polarized parallel light transmitter and the optical fiber used by the fiber optic spectrometer 82 are interconnected through a bifurcated fiber structure to form three bifurcated optical fibers 9 with four ends, so that the fiber collimator 73 of the broadband linearly polarized parallel light transmitter passes through the bifurcated optical fiber. The fork fiber is connected with the fiber cold light source 72 and the fiber optic spectrometer 82 at the same time, and the fiber optic spectrometer 82 is connected with the fiber collimator 83 as an accessory through the fork fiber at the same time.

When the incident parallel light beam irradiates the coupling prism 61 of the test component 6, the light beam reflected from the prism 61 can be returned along the original path by adjusting the angle measuring turntable 5, received by the fiber collimator 73 and then transmitted by the bifurcated optical fiber 9 to the fiber optic spectrometer 82 for detection, thereby realizing the precise optical path collimation and zero-degree incident angle positioning functions of the test platform.

The angle measuring turntable 5 can be a manually operated angle measuring turntable, or a fully automatic angle measuring turntable driven by a motor.

The angle-measuring turntable 5 can be replaced with a pole sleeve when no angle measurement is required. The pole sleeve is placed above the fixed disk 4 and coaxially fixedly connected with the fixed disk 4. The wall of the pole sleeve is provided with Fasten the screw, the test component 6 is rotatably connected with the support rod sleeve through its own pole, and the test component 6 is adjusted to an appropriate position by rotating the pole and then locked by the fastening screw.

When the attenuated total reflection optical measurement platform is used to test and analyze the characteristics of optical waveguide waveguide, the test component 6 selects the optical waveguide test device (invention patent, application number: 200910080063.1, application date: March 18, 2009); When testing and analyzing the characteristics of the optical waveguide sensor, the test component uses the optical waveguide biochemical sensor test device (invention patent, application number: 200910093766.8, application date: September 28, 2009); when used to test and analyze the characteristics of the SPR sensor or the waveguide mode spectral characteristics When, the test part 6 selects the prism total reflection test device for use; when used for testing and analyzing the thickness and the refractive index of the film sample and its optical properties, the test part 6 selects the prism total reflection test device for use, and the film sample to be tested replaces the light sensor chip.

Example:

The base 1, the rotating arm 2, the fixed arm 3 and the fixed disc 4 are made of stainless steel. The size of the base 1 is 195mm×100mm×12mm, the size of the rotating arm 2 is 80mm×25mm×12mm, and the size of the fixed arm 3 is 45mm×20mm× 12mm, the diameter of the fixed disk 4 is 90mm, and the thickness is 25mm; the angle measurement turntable 5 is a commercially available manual rotary table with a diameter of 80mm and an angle fine-tuning screw 51; the optical fiber broadband cold light source 72 is a commercially available tungsten halogen lamp optical fiber cold light source, optical fiber The spectrometer 82 is a commercially available CCD (Charge Coupled Device) fiber optic spectrometer with a spectral testing range of 300nm-1000nm and a spectral resolution of 1nm. The bifurcated optical fiber at both ends is a quartz multimode optical fiber with a core diameter of 600 μm and an SMA optical fiber adapter at each end of the optical fiber.

The test part 6 adopts a prism total reflection test device, the device chassis 67, the pressure block 64, the beam 65 and the fastening screw 66 are made of duralumin, the coupling prism 61 is made of high refractive index glass, and the side length of the triangular bottom of the prism is 25mm ×25mm×35.36mm, the prism height is 25mm. The sensor chip 62 is an SPR chip, which is composed of a 45nm thick gold film sputtered on the surface of a BK7 glass substrate. The chip size is 25mm×20mm×1mm. The sample groove 63 is made of silicon rubber block, and the size of the sample groove is 25mm×25mm×5mm , The optical coupling fluid is methylene iodide.

Turn on the tungsten-halogen lamp optical fiber cold light source 72, the light emitted from the optical fiber passes through the optical fiber collimator 73 and the polarizer 74 and becomes a linearly polarized parallel beam. The turntable 5 makes the beam reflected from the prism 61 return along the original path and is received by the fiber collimator 73, and then transmitted to the fiber optic spectrometer 82 by the bifurcated fiber 9, and stops adjusting the angle measurement when the spectral intensity detected by the fiber optic spectrometer reaches the maximum The turntable 5 reads the degree specified by the angle measurement turntable, and the incident angle corresponding to the degree is zero degree. Then adjust the goniometric turntable 5 again so that the incident angle is set to 8°. Then rotate the rotating arm 2 and fine-tune the detector bracket 81 so that the attenuated total reflection beam emitted from the coupling prism 61 is received by the fiber collimator 83 and transmitted to the fiber optic spectrometer 82 by the bifurcated fiber 9 . When the spectral intensity detected by the fiber optic spectrometer 82 reaches the maximum, the rotating arm 2 is locked by the fastening screw 21 .

Use a pipette to inject deionized water into the sample tank 63 and record the reflected light intensity spectrum detected by the optical fiber spectrometer 82 . Then, the deionized water in the sample tank 63 was replaced with an aqueous solution of lysozyme with a concentration of 2 μM, and at the same time, the reflected light intensity spectrum was continuously recorded at intervals of 1 s. Stop recording when the spectrum is observed to no longer change with time. After the solution is taken out from the sample tank 63, the fastener of the sample tank is loosened, a new SPR chip is replaced, and the sample tank 63 is taken out for cleaning for next use. Figure 5 shows the resonance spectra of the SPR sensor measured under the condition that the incident angle is 8°, the sample tank is filled with deionized water and lysozyme aqueous solution with a concentration of 2 μM. Each spectrum includes a valley, and the wavelength corresponding to the valley is the SPP resonance wavelength. The adsorption of lysozyme on the surface of the SPR chip caused the red shift of the SPP resonance wavelength relative to the corresponding SPP resonance wavelength of 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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