CN102590139A - Refractive index measuring device of transparent fluid under high pressure - Google Patents
Refractive index measuring device of transparent fluid under high pressure Download PDFInfo
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- CN102590139A CN102590139A CN2012100381822A CN201210038182A CN102590139A CN 102590139 A CN102590139 A CN 102590139A CN 2012100381822 A CN2012100381822 A CN 2012100381822A CN 201210038182 A CN201210038182 A CN 201210038182A CN 102590139 A CN102590139 A CN 102590139A
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Abstract
The invention provides a refractive index measuring device of transparent fluid under high pressure; a light beam output by a light source is converted into a parallel light through a concave mirror, the parallel light beam vertically enters a window I through a reflecting mirror and a sampling mirror sequentially and vertically enters an entrance of a spectrometer through to-be-measured fluid which is placed in a sealing mechanism and a window II; the surfaces of the window I and the window II are arranged in parallel, the power of the output parallel light beam which is reflected by the sampling mirror is monitored and measured by a power monitor, the temperature of the sealing mechanism which contains the to-be-measured fluid is measured by a thermal couple, a thermostat is used for keeping the temperature of the to-be-measured fluid in the experiment to be constant, a switch I is used for controlling the injection of the gas to increase the fluid pressure in the sealing mechanism, a switch II is used for controlling a vacuum pump to work so as to reduce the pressure of the to-be-measured fluid in the sealing mechanism, and the pressure of the to-be-measured fluid is measured by a pressure measuring device. The refractive index measuring device can realize the method of measuring the refractive index of high-pressure transparent fluid under different wavelengths in a wide spectrum range at the same time, and the device is simple in structure, convenient in adjustment and high in measuring precision.
Description
Technical field
The invention belongs to field of optical measuring technologies, relate generally to the simultaneously-measured method and apparatus of refractive index of transparent fluid different wave length under the high pressure.
Background technology
Refractive index is the ratio of aerial speed of light and the speed of light in this material; It is one of fundamental physical quantity that characterizes optical transparency material optical property; Different components concerning liquid, refractive index is different, and gas refracting index is relevant with air pressure, temperature, humidity and gas componant.Space distribution through measuring refractive index in the medium and over time; And then qualitative analysis and even quantitatively confirm other various related physical quantities; Many important practical applications are arranged, and therefore, the fluid refractive index is significant for fluid behaviour under the research high pressure under the measurement different pressures.At present, different materials, the measuring method of refractive index is different; Refractometry method commonly used has: the minimum deviation horn cupping of spectrometer is used in (1); Though this method measuring accuracy is high, and is also high to the requirement of testing sample, except need are processed into sample the prism; Also to the prism drift angle that is processed into and wherein the flatness on two planes higher accuracy requirement is arranged, increased the measurement cost; (2) Abbe refractometer critical angle method, this method measuring error factor is more, and requires the refractive index of sample must not be greater than 1.7, thereby can not use some sample; (3) interference technique, this method are in measuring process, because testing sample needs adjustment repeatedly with the measurement light path, thereby the light path adjustment is complicated, and intensity hand-manipulated is big, and the measuring process time is long, is unfavorable for realizing the robotization of measuring process.
Domestic patent of invention ZL86107252 provides interference technique to measuring device of refraction index of air; Patent of invention ZL90102943 provides a kind of automatic V prismatic refraction rate appearance of measuring transparency material refractive indexes such as glass; Patent of invention ZL93114899 provides a kind of air refraction measuring method of moving based on laser cavity change displacement; External patent of invention US7130060B2 provides the refractometry method that small interference reflection is surveyed; US4733967 and US4685803 provide gas refracting index measuring method and the device that adopts interferometric method; More than these patents be based on the development of refraction index test method commonly used because its limitation can't be used the refractometry of fluid under high pressure.
The present invention proposes transparent fluid under the high pressure (liquids and gases) measuring method and device in the wide range scope different wave length refractive index of (relating to far infrared and ultraviolet region); Realization is changed measurement accurately, fast and automatically to the sample refractive index, can provide the dispersion equation of transparent fluid under the high pressure simultaneously.
Summary of the invention
The technical matters that the present invention will solve provides transparency liquid under a kind of high pressure/gas refracting index measurement mechanism.
The technical scheme that transparency liquid under the high pressure among the present invention/the gas refracting index measurement mechanism is adopted is: the light source output beam becomes directional light through concave mirror; Parallel beam impinges perpendicularly on the window I through after catoptron and the sampling mirror successively, enters the mouth through impinging perpendicularly on spectrometer after the detected fluid that is placed on sealing mechanism and the window II again; The surface of window I and window II laterally arranges; Parallel beam by the sampling mirror reflection carries out control survey through the power-monitoring appearance to the parallel beam power of exporting; The sealing mechanism of splendid attire detected fluid is measured temperature through thermocouple, keeps detected fluid temperature constant in the experiment through constant temperature oven, and the switch I is used for the injection of pilot-gas; To increase sealing mechanism inner fluid pressure; The switch II is used to control vacuum pump work, and to reduce detected fluid pressure in the sealing mechanism, the pressure of detected fluid is measured through pressure-measuring device.
The invention has the beneficial effects as follows; To transparent fluid (liquids and gases) measuring method and device in the wide range scope different wave length refractive index of (relating to far infrared and ultraviolet region); With the real-time diagnosis that is applied to high pressure transparent fluid refractive index, provide the dispersion equation of multiple transparent medium simultaneously; Apparatus structure is simple, and is easy to adjust, and measuring accuracy is high.
Description of drawings
Fig. 1 is the structural representation of transparent fluid apparatus for measuring refractive index under the high pressure of the present invention.
Among the figure; 1. catoptron 2. light sources 3. concave mirrors 4. sampling mirror 5. power-monitoring appearance 6. thermocouple 7. constant temperature ovens 8. window I 9. detected fluid 10. sealing mechanisms 11. window II 12. spectrometers 13. temperature indicators 14. gases 15. switch I 16. feed channel 17. pressure-measuring devices 18. switch II, 19. vacuum pumps.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 1; Light source 2 output beams become directional light through concave mirror 3, and light beam impinges perpendicularly on window I 8 through after catoptron 1 and the sampling mirror 4, and light beam impinges perpendicularly on spectrometer 12 through after the detected fluid 9 that is placed on sealing mechanism 10 and the window II 11; Window I 8 is surperficial parallel with window II 11; Carry out control survey by the light beam power of sampling mirror 4 beam reflected through 5 pairs of outputs of power-monitoring appearance, the sealing mechanism 10 of splendid attire detected fluid 9 is measured temperature through thermocouple 6, keeps detected fluid 9 temperature constant in the experiment through constant temperature oven 7; Open switch I 15 injecting gas 14 and increase sealing mechanism 10 inner fluid pressure; Or open switch II 18 and let vacuum pump 19 work simultaneously, reducing detected fluid 9 pressure in the sealing mechanism 10, the pressure of detected fluid 9 is measured through pressure-measuring device 17.
Light source 2 is a wideband light source, can select the lamp like WBr (bromine tungsten) for use, and output power is adjustable continuously, and output power stability is less than 0.01%.
Sampling mirror 4 is carved the plate of splitting at angle surely for I, as to carve the angle be 10 degree;
Window I 8 is AL with the material of window II 11
2O
3Window I 8 is surperficial parallel with window II 11, and the depth of parallelism is less than 1 °, and former and later two surfaces of window I 8 and the front and rear surfaces face type of window II 11 require less than λ/4, λ=632.8nm;
The thickness of the detected fluid 9 in sealing mechanism 10 is as far as possible little, gets 1 ~ 2mm.
Through regulating the output power of light source 2, make the strength signal that gets on the spectrometer 12 between (1/2 ~ 2/3) maximal value;
Also can adopt the slit inlet of Optical Fiber Transmission from the light beam of window II 11 outgoing to spectrometer 12; Accomplish respectively from the coupling of the light beam and optical fiber one end of window II 11 outgoing through five dimension governor motions at the optical fiber two ends, the coupling of the slit of the optical fiber other end and spectrometer 12;
Spectrometer 12 has the 240nm spectral width by the grating and the ccd detector of one 150 groove, keeps the incident beam strength stability less than 0.01%;
When incident light impinged perpendicularly on dielectric surface, reflectivity (or transmissivity) was relevant with refractive index; For the light of a certain wavelength X, the temperature of cavity inner fluid does
T 0, pressure does
P 0The time, the transmissivity of light beam front and rear surfaces in window and cavity can be write as:
In the formula,
n WBe the refractive index of window material for a certain wavelength, the refractive index of a certain wavelength does in the vacuum
n 0If the cavity hydrodynamic pressure does
P 1, temperature does
T 1The time, for the light of a certain wavelength X, surface behind window and cavity interior wall, transmissivity is:
In the formula,
n GIt is refractive index for fluid under a certain wavelength.If pass temperature do
T 0, pressure does
P 0Cavity fluid and temperature do
T 1, pressure does
P 1The time transmitted light intensity be respectively
With
, then the transmitted light intensity ratio is respectively:
Through measuring the light intensity of different pressures and temperature cavity of resorption inner fluid
With
, in known window and vacuum refractive index
n WWith
n 0Under the situation, establish
The refractive index of fluid under corresponding wavelength can obtain according to following equation:
Adopt spectrometer 12 to provide multiple transparent fluid after the different wave length refractive index of wide range scope, can provide dispersion equation.
Claims (7)
1. transparent fluid apparatus for measuring refractive index under the high pressure; It is characterized in that: the light source in the said measurement mechanism (2) output beam becomes directional light through concave mirror (3); Parallel beam impinges perpendicularly on window I (8) after passing through catoptron (1) and sampling mirror (4) successively, enters the mouth through impinging perpendicularly on spectrometer (12) after the detected fluid (9) that is placed on sealing mechanism (10) and the window II (11) again; Window I (8) laterally arranges with the surface of window II (11); Parallel beam by sampling mirror (4) reflection carries out control survey through power-monitoring appearance (5) to the parallel beam power of exporting; The sealing mechanism (10) of splendid attire detected fluid (9) is measured temperature through thermocouple (6); Keep detected fluid (9) temperature constant in the experiment through constant temperature oven (7); Switch I (15) is used for the injection of pilot-gas (14), and to increase sealing mechanism (10) inner fluid pressure, switch II (18) is used to control vacuum pump (19) work; To reduce the interior detected fluid of sealing mechanism (10) (9) pressure, the pressure of detected fluid (9) is measured through pressure-measuring device (17).
2. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 1 is characterized in that: described light source (2) is a wideband light source.
3. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 2 is characterized in that: described wideband light source is that output power is adjustable continuously, degree of stability is less than 0.01% bromine tungsten filament lamp.
4. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 1 is characterized in that: the thickness of the detected fluid (9) in the described sealing mechanism (10) is 1 ~ 2mm.
5. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 1; It is characterized in that: the surperficial depth of parallelism of described window I (8) and window II (11) is less than 1 °; Former and later two surfaces of window I (8) and the front and rear surfaces face type of window II (11) are less than λ/4, λ=632.8nm.
6. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 1 is characterized in that: described spectrometer (12) strength stability is less than 0.01%.
7. transparent fluid apparatus for measuring refractive index under the high pressure according to claim 1 is characterized in that: described sealing mechanism (10) inwall is a black.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210038182.2A CN102590139B (en) | 2012-02-21 | 2012-02-21 | Refractive index measuring device of transparent fluid under high pressure |
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| CN201210038182.2A CN102590139B (en) | 2012-02-21 | 2012-02-21 | Refractive index measuring device of transparent fluid under high pressure |
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| CN102590139A true CN102590139A (en) | 2012-07-18 |
| CN102590139B CN102590139B (en) | 2014-01-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121390A (en) * | 2017-06-08 | 2017-09-01 | 河南师范大学 | A kind of pressue device of test liquid refractive index |
| CN108169174A (en) * | 2017-12-28 | 2018-06-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of liquid refractivity test device and test method based on the method for minimum deviation angle |
| RU2796797C2 (en) * | 2021-10-18 | 2023-05-29 | Елена Александровна Бадеева | Fibre-optic method for determining the refractive coefficient of a transparent substance and a fibre-optical refractometric measuring converter implementing it |
| CN116908116A (en) * | 2023-09-13 | 2023-10-20 | 中国工程物理研究院流体物理研究所 | Multiple compressed fluid single-shot multiple information diagnostic target |
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2012
- 2012-02-21 CN CN201210038182.2A patent/CN102590139B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702604A (en) * | 1985-12-31 | 1987-10-27 | L'universite Du Quebec A Trois-Rivieres | Precise determination of the compressibility factor of a gas from refractive index measurements |
| US4685803A (en) * | 1986-01-23 | 1987-08-11 | Zygo Corporation | Method and apparatus for the measurement of the refractive index of a gas |
| CN86107252A (en) * | 1986-10-21 | 1988-05-04 | 北京机械工业管理学院分部 | Measuring device of refraction index of air |
| US5311274A (en) * | 1992-05-11 | 1994-05-10 | Cole Jr Charles F | Fiber optic refractometer |
| JPH07159321A (en) * | 1993-12-02 | 1995-06-23 | Kobe Steel Ltd | Measuring method for refractive index of gas at inside of high-pressure container |
| US20030095248A1 (en) * | 2001-11-16 | 2003-05-22 | Didier Frot | Optical-fiber refractometer |
| US20030193662A1 (en) * | 2002-04-10 | 2003-10-16 | Baker Hughes Incorporation | Method and apparatus for a downhole refractometer and attenuated reflectance spectrometer |
| US20060012800A1 (en) * | 2002-09-05 | 2006-01-19 | Bornhop Darryl J | Refractive index determination by micro interferometric reflection detection |
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| CN102156111A (en) * | 2011-05-18 | 2011-08-17 | 中国科学院上海光学精密机械研究所 | Device and method for measuring nonlinear refractive index coefficient of inert gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121390A (en) * | 2017-06-08 | 2017-09-01 | 河南师范大学 | A kind of pressue device of test liquid refractive index |
| CN107121390B (en) * | 2017-06-08 | 2020-06-19 | 河南师范大学 | Pressurizing device for testing liquid refractive index |
| CN108169174A (en) * | 2017-12-28 | 2018-06-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of liquid refractivity test device and test method based on the method for minimum deviation angle |
| RU2796797C2 (en) * | 2021-10-18 | 2023-05-29 | Елена Александровна Бадеева | Fibre-optic method for determining the refractive coefficient of a transparent substance and a fibre-optical refractometric measuring converter implementing it |
| CN116908116A (en) * | 2023-09-13 | 2023-10-20 | 中国工程物理研究院流体物理研究所 | Multiple compressed fluid single-shot multiple information diagnostic target |
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