CN202599830U - Measurement system for refractive index of micro-liquid - Google Patents
Measurement system for refractive index of micro-liquid Download PDFInfo
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- CN202599830U CN202599830U CN 201220168948 CN201220168948U CN202599830U CN 202599830 U CN202599830 U CN 202599830U CN 201220168948 CN201220168948 CN 201220168948 CN 201220168948 U CN201220168948 U CN 201220168948U CN 202599830 U CN202599830 U CN 202599830U
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Abstract
The utility model discloses a measurement system for a refractive index of micro-liquid. The measurement system comprises a laser light source, a first convex lens, a second convex lens, first optical plate glass, a micro-fluidic chip, second optical plate glass and a charge-coupled device (CCD) detector. Collimated light emitted by the laser light source penetrates through the first and second convex lenses to form light with decreased light spots, the light is incident to the first optical plate glass at an angle of 45 degrees to generate a path of reflected light and a path of refracted light, any path of the reflected light and the refracted light penetrates through a micro-fluid channel, the other path of the reflected light and the refracted light directly penetrates through the micro-fluidic chip, then enters the second optical plate glass, and can be converged and interfered to generate an interference optical signal after passing through the second optical plate glass, and the CCD detector detects the interference optical signal. By the micro-fluidic chip, analysis cost is lowered, and environmental pollutions caused by waste produced by an analysis process are reduced. The whole system has the characteristics of compact structure, small size, convenience for carrying and the like, and is easy to maintain.
Description
Technical field
The utility model relates to the measuring technique of liquid refractivity, more particularly relates to a kind of measuring system of trace quantity liquid refractivity.
Background technology
Refractive index is liquid important measuring parameter in industrial and agricultural production and scientific research, and it is to guarantee product quality and the important technical that improves product yield.The measurement of liquid refractivity is had a wide range of applications with being controlled in the industries such as environmental monitoring, food quality, pharmacy, medical diagnosis on disease.Refractive index is one of fundamental physical quantity that characterizes optical transparency material optical property, in various optical transparency materials, such as the variation of density, concentration, temperature, stress and so on physical quantities, all can cause the respective change of refractive index.Therefore, the method for measuring of refractive index has important and practical meanings.Trace quantity liquid refractivity measuring technique system mainly contains the Fabry Perot interferometry, beam deflection method, schlieren method, fibre-optic waveguide effect method, holographic probe method and back scattering interferometric method at present.Be placed on stream of cells in the Fabry Perot interferometer as far back as nineteen eighty-two Steven D.Woodruff, light arrives stream of cells with Brewster angle incidence.Through behind the fabry perot interferometer, interference signal is surveyed by photomultiplier, then by the registering instrument tracer signal.This method is because need place testing liquid in the fabry perot interferometer, and the strict theta alignment of needs, has caused the adjusting operating difficulties and the inconvenience of device.In order to improve detection sensitivity and not limited by the strictness of angle of light degree etc.; The two methods of surveying of usefulness such as Steven D.Woodruff are improved; Laser is divided into two-beam through optical plate glass, all through being surveyed by two phototubes respectively behind the fabry perot interferometer of built-in stream of cells.But this method needs two detectors, causes system complex, and structure is huge, and cost increases.Employing wollaston prisms such as Janusz are divided into two-beam with wavelength 633nm LASER Light Source, and light beam comes calculation sample refractive index through light beam through the deflection behind the sample through being surveyed by photodetector behind the sample.The influence that the deflection of detection light receives environmental perturbation is bigger, causes result's deviation.Fibre-optic waveguide effect method is to utilize the fibre-optic waveguide effect of Fibre Optical Sensor method to survey liquid refractivity.The change of refractive index can cause the bending loses of spirality waveguide, bending loses along with the radius of bending in other words the effective refractive index difference descend and increase.The radius of curvature R of spiral single mode waveguide fiber waveguide in the direction of propagation reduces, and the loss meeting little by little increases the effective refractive index difference in the direction of propagation, and at certain a bit, light is lost to zero in the spirality waveguide.Fundamentals of Sensors just are based on by what the refringence increase caused and are lost to moving of this point of zero.The direct refractive Index Measurement of length that light is propagated in the spirality waveguide is poor.This method needs optical waveguide in liquid, and is bigger to the restriction ratio of liquid, can only be to specific liquid.Holographic probe method is that holographic optical elements (HOE) produces reference and detecting light beam.Light beam transmits as fan, interferes in the far field to produce equally spaced striped, and the change of refractive index produces moving of striped.The condition that interfere in the far field causes the structure of system huge.Bornhop group has developed the back scattering interferometry, and the laser radiation portion of channel survey moving of striped with position sensitive detector or CCD, but back scattering method interference of stray light causes the decline to the interference signal detection sensitivity.
Indulge the above, how obtaining easy high-precision miniaturization can portable trace quantity liquid refractivity measuring system be big technological difficulties.
The utility model content
To the defective that exists in the prior art, the purpose of the utility model provides a kind of measuring system of trace quantity liquid refractivity.
For achieving the above object, the utility model adopts following technical scheme:
A kind of measuring system of trace quantity liquid refractivity comprises:
LASER Light Source adopts the He-Ne LASER Light Source;
Telescope is located at the place ahead of LASER Light Source, and said telescope comprises first convex lens and second convex lens that laterally arrange, and said LASER Light Source passes first convex lens and second convex lens along primary optical axis; The front focus of the back focus of said first convex lens and second convex lens overlaps;
First optical plate glass is located at telescopical rear, and first face plated film of first optical plate glass is that 40%, the second face plated film is 100%; Pass telescopical laser and incide first optical plate glass, produce one road reflected light, produce one road refract light with first face through second face of first optical plate glass through first face of first optical plate glass with 45;
Micro-fluidic chip comprises the microfluid passage that holds micro liquid to be measured, and said reflected light and refract light are parallel to each other behind first optical plate glass; Microfluid passage is passed on arbitrary road in said reflected light and the refract light, and micro-fluidic chip is directly passed on another road;
Second optical plate glass parallels with said first optical plate glass; First face plated film of second optical plate glass is that 40%, the second face plated film is 100%; The reflected light that passes micro-fluidic chip gets into second optical plate glass, and refract light is by first face reflection of second optical plate glass, and two light beams form interference light signal through second optical plate glass post-concentration together and interfere;
Ccd detector is used to survey interference light signal;
Wherein, the focal length of first convex lens equates with the ratio of the spot diameter of the telescopical laser of process with the ratio of the focal length of second convex lens and the spot diameter of LASER Light Source; The spot diameter of the telescopical laser of process is less than the width of microfluid passage.
The width of said microfluid passage is 250 μ m.
The thickness of said first optical plate glass and second optical plate glass is 1mm.
The height of said microfluid passage is more than 100 μ m.
Adopt the measuring system of a kind of trace quantity liquid refractivity of the utility model; In based on the two-beam interference technology, adopt the optical plate glass beam split; Adopt the optical plate glass of two parallel placements, utilize the optics principle of reversibility, dexterously being focused at together through microfluid passage and direct two-beam respectively through micro-fluidic chip; And parallel displacement structure; Make second optical plate glass to have compensated the light path of first optical plate glass, the optical path difference of this two-beam causes by testing medium in the microfluid passage is different fully, has improved the precision of measurement result.
Compare with background technology, the beneficial effect that the utlity model has is:
1, utilize lens combination that the hot spot of light source is narrowed down to the size less than microfluid passage; Utilize the control of optical plate glass plated film reflectivity to obtain the near collimated light of two-beam strong cohesiveness; Hot spot reaches the hundreds of micron dimension, and two-beam is the distance of hundreds of micron also apart.
2, adopt two optical plate glass combinations, utilize the optics principle of reversibility, make two-beam be focused at together and interfere, no longer need two detectors to survey respectively or the restriction of far field interference condition.
3, the parallel placement of two optical plate glass; Device is " Z " structure; Second optical plate glass compensated first optical plate glass and has been divided into the optical path difference that two-beam produces; Make the optical path difference of reference light and sample light cause by the medium of process in the micro-fluidic chip is different fully, improved the sensitivity of surveying;
4, the measuring system of the trace quantity liquid refractivity of the utility model and measuring method; Micro-fluidic chip brings reducing of refuse environmental pollution that reduction and the analytic process of analysis cost produce, whole device have compact conformation, volume little, be easy to safeguard and characteristics such as portable.
Description of drawings
Fig. 1 is the measuring principle of measurement system synoptic diagram of a kind of trace quantity liquid refractivity of the utility model;
Fig. 2 is the beam split synoptic diagram of first optical plate glass among Fig. 1.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with accompanying drawing and embodiment.
See also the measuring system of a kind of trace quantity liquid refractivity shown in Figure 1, comprise LASER Light Source 11, and employing He-Ne LASER Light Source (He-Ne laser, Melles Griot, USA);
Telescope; Be located at the place ahead of LASER Light Source 11, telescope comprise first convex lens 12 that laterally arrange (linos Inc., Qioptiq) and second convex lens 13 (the linos Inc.; Qioptiq), LASER Light Source 11 passes first convex lens 12 and second convex lens 13 along primary optical axis; The back focus of first convex lens 12 is that the front focus of left focus and second convex lens 13 of first convex lens 12 among Fig. 1 is that the right focus of second convex lens 13 among Fig. 1 coincides;
First optical plate glass 14 (Edmund Optics) is located at telescopical rear, and first face 141 plated films of first optical plate glass 14 are that 40%, the second face 142 plated film is 100%; Pass telescopical laser and incide first optical plate glass 14, produce one road reflected light 21, produce one road refract light 22 with first face through second face of first optical plate glass through first face of first optical plate glass with 45;
Micro-fluidic chip 15 (Swiss Federal Institute of Technology; Lausanne); Be to become circuit the same, make them be integrated in the micro-total analysis system on the chip material (substrate) through the function components and parts image sets such as microfluid passage, Micropump, little valve, little reservoir, microelectrode, little detecting element, window and connector that Micrometer-Nanometer Processing Technology will hold micro liquid to be measured.The area of micro-fluidic chip 15 is about several square centimeters.The material that is used to make the micro-fluidic chip of the utility model is that dimethyl silicone polymer is called for short PDMS, and principal character is that resulting structure such as the microfluid passage of holding fluid are the micron order yardstick.Compare with the experimental provision of macro-scale; The micron order structure of micro-fluidic chip enlarges markedly the area/volume ratio example of fluid environment; Micro-fluidic chip makes that the analytical equipment volume reduces waits performance improvement, bring analysis cost reduction and analytic process generation the refuse environmental pollution advantage such as reduce.The microfluid passage width is 250 μ m, highly is more than the 100 μ m, and detection accuracy can reach 10-4R I U like this.Reflected light 21 and refract light 22 are parallel to each other behind first optical plate glass 14; Microfluid passage is passed on arbitrary road in reflected light 21 and the refract light 22, and micro-fluidic chip is directly passed on another road;
Second optical plate glass 16 (Edmund Optics) parallels with first optical plate glass 14; First face 161 plated films of second optical plate glass 16 are that 40%, the second face 162 plated film is 100%; The reflected light 21 that passes micro-fluidic chip 15 gets into second optical plate glass 16 and is refracted to second face 162 back reflection through first face 161 and returns first face 161 and be refracted in the atmosphere again; Refract light 22 is by first face 161 reflections of second optical plate glass 16; Two light beams form interference light signal through second optical plate glass post-concentration together and interfere;
Ccd detector 17 (E2v Inc., Aviiva SM2 CL2014) is used to survey interference light signal; Ccd detector 17 calculates optical path difference through the position traverse measurement that display can be observed interference fringe.
Wherein, the focal length of first convex lens equates with the ratio of the spot diameter of the telescopical laser of process with the ratio of the focal length of second convex lens and the spot diameter of LASER Light Source; The spot diameter of the telescopical laser of process is less than the width of microfluid passage.
See also shown in Figure 2ly again, wherein first optical plate glass, 14 thickness h are 1mm, and light incides first face 141 of first optical plate glass with 45; Part reflection, a part incides in the glass, arrives second first face rear section of face 142 reflected backs and shines in the air; Then obtained two bundles directional light separately; This two-beam is 756 μ m at a distance of d, and two faces plated film respectively are 40% and 100%, and the light intensity of this two-beam is respectively 11% and 8% of incident light.
If adopting the light source hot spot is the He-Ne LASER Light Source of 1mm, be first convex lens 12 of 20mm and second convex lens that focal length is 4.6mm through focal length after, the light source hot spot is 230 μ m.Through after first optical plate glass beam split, two Gauss's light beams impinge perpendicularly on the micro-fluidic chip 15 that is attached to substrate of glass 18, and wherein a branch of through the microfluid passage of liquid is arranged, another bundle light directly passes through micro-fluidic chip.Two light beams are through being second optical plate glass with second same optical plate glass of 45 incident still behind the micro-fluidic chip, and this two light beam interferes through second optical plate glass post-concentration together.Beam and focus on the microfluid passage plane is 230 μ m, less than the width of microfluid passage 250 μ m.Two glass parallel flats are placements parallel to each other, and thickness material etc. is duplicate, and thickness is 1mm.So the optical path difference through two light beams is only passed through different medium on micro-fluidic chip.Two light beams are compensated by second optical plate glass through the optical path difference that produces behind first optical plate glass, and laying method has improved detection sensitivity greatly like this.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the purpose that is used for explaining the utility model; And be not with the qualification of doing the utility model; As long as in the essential scope of the utility model, in the scope to the variation of the above embodiment, claim that modification all will drop on the utility model.
Claims (4)
1. the measuring system of a trace quantity liquid refractivity is characterized in that, comprising:
LASER Light Source adopts the He-Ne LASER Light Source;
Telescope is located at the place ahead of LASER Light Source, and said telescope comprises first convex lens and second convex lens that laterally arrange, and said LASER Light Source passes first convex lens and second convex lens along primary optical axis; The front focus of the back focus of said first convex lens and second convex lens overlaps;
First optical plate glass is located at telescopical rear, and first face plated film of first optical plate glass is that 40%, the second face plated film is 100%; Pass telescopical laser and incide first optical plate glass, produce one road reflected light, produce one road refract light with first face through second face of first optical plate glass through first face of first optical plate glass with 45;
Micro-fluidic chip comprises the microfluid passage that holds micro liquid to be measured, and said reflected light and refract light are parallel to each other behind first optical plate glass; Microfluid passage is passed on arbitrary road in said reflected light and the refract light, and micro-fluidic chip is directly passed on another road;
Second optical plate glass parallels with said first optical plate glass; First face plated film of second optical plate glass is that 40%, the second face plated film is 100%; The reflected light that passes micro-fluidic chip gets into second optical plate glass, and refract light is by first face reflection of second optical plate glass, and two light beams form interference light signal through second optical plate glass post-concentration together and interfere;
Ccd detector is used to survey interference light signal;
Wherein, the focal length of first convex lens equates with the ratio of the spot diameter of the telescopical laser of process with the ratio of the focal length of second convex lens and the spot diameter of LASER Light Source; The spot diameter of the telescopical laser of process is less than the width of microfluid passage.
2. the measuring system of trace quantity liquid refractivity according to claim 1 is characterized in that:
The width of said microfluid passage is 250 μ m.
3. the measuring system of trace quantity liquid refractivity according to claim 1 is characterized in that:
The thickness of said first optical plate glass and second optical plate glass is 1mm.
4. the measuring system of trace quantity liquid refractivity according to claim 1 is characterized in that:
The height of said microfluid passage is more than 100 μ m.
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|---|---|---|---|
| CN 201220168948 CN202599830U (en) | 2012-04-19 | 2012-04-19 | Measurement system for refractive index of micro-liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220168948 CN202599830U (en) | 2012-04-19 | 2012-04-19 | Measurement system for refractive index of micro-liquid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636457A (en) * | 2012-04-19 | 2012-08-15 | 上海理工大学 | Trace liquid refractive index measuring system and measuring method |
| CN103705222A (en) * | 2014-01-17 | 2014-04-09 | 上海理工大学 | Tissue water content real-time measuring device based on electrocoagulation closer |
| CN110837202A (en) * | 2018-08-17 | 2020-02-25 | 欧菲影像技术（广州）有限公司 | Calibration method for camera analysis force test |
-
2012
- 2012-04-19 CN CN 201220168948 patent/CN202599830U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636457A (en) * | 2012-04-19 | 2012-08-15 | 上海理工大学 | Trace liquid refractive index measuring system and measuring method |
| CN103705222A (en) * | 2014-01-17 | 2014-04-09 | 上海理工大学 | Tissue water content real-time measuring device based on electrocoagulation closer |
| CN110837202A (en) * | 2018-08-17 | 2020-02-25 | 欧菲影像技术（广州）有限公司 | Calibration method for camera analysis force test |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20150419 |
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| EXPY | Termination of patent right or utility model |