CN204439529U - Based on the polarimeter of Sagnac ring optical interference system - Google Patents
Based on the polarimeter of Sagnac ring optical interference system Download PDFInfo
- Publication number
- CN204439529U CN204439529U CN201520141199.XU CN201520141199U CN204439529U CN 204439529 U CN204439529 U CN 204439529U CN 201520141199 U CN201520141199 U CN 201520141199U CN 204439529 U CN204439529 U CN 204439529U
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- fiber coupler
- polarization maintaining
- optical fibre
- maintaining optical
- fiber
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Abstract
The utility model discloses a kind of polarimeter based on Sagnac ring optical interference system, primarily of light source, polarization maintaining optical fibre, first fiber coupler, the polarizer, second fiber coupler, optic fiber ring-shaped cavity, analyzer and photodetector are formed, wherein light source is connected with the first fiber coupler by polarization maintaining optical fibre with photodetector, first fiber coupler and the second fiber coupler are connected by polarization maintaining optical fibre and polarization maintaining optical fibre between the first fiber coupler and the second fiber coupler are provided with the polarizer and analyzer, second fiber coupler is connected with optic fiber ring-shaped cavity, the polarization maintaining optical fibre of this optic fiber ring-shaped cavity is provided with 1/4 slide along clockwise direction successively, absorption of sample pond, 1/4 slide and phase-modulator.The utility model solves the calibration of free space interference and the intrinsic difficulty of installation, and reduce volume, sensitivity is very high, starts very fast, strong interference immunity, and has two-way reciprocity, thus improve the precision of measurement.
Description
Technical field
The utility model belongs to polarimeter technical field, is specifically related to a kind of polarimeter based on Sagnac ring optical interference system.
Background technology
Nature has a lot of materials all to have optically-active characteristic, and liquid has oils, tartrate etc., and solid has crown glass, quartz crystal etc.And polarimeter is the best instrument measuring optically-active characteristic, the analysis to material concentration, purity, composition can be realized by the optical activity measuring sample, be widely used in medicine production, food analysis, quantitative measurment and experimental study etc.At present polarimeter common on the market has two kinds, a kind of polarimeter being laboratory and using, i.e. mechanical part adjustment extinction coefficient manually, and regulate index dial, read registration with eyes, this kind of polarimeter cost is lower, and degree of accuracy is also very low, and error is larger; Another kind is the polarimeter of industrial application, utilizes the design such as optoelectronic component and mechanical organ, and utilize mechanical rotation to measure angle of rotation, precision increases, but volume is large, and Heavy Weight is mobile very difficult.Therefore, from the angle of practicality, improve precision, reduce cost, alleviate the key that volume is research at present.
Summary of the invention
The technical matters that the utility model solves there is provided a kind of polarimeter based on Sagnac ring optical interference system, and this polarimeter efficiently solves that the volume existing for polarimeter in the market described by background technology is large, Heavy Weight and the low problem of precision.
The utility model adopts following technical scheme for solving the problems of the technologies described above, based on the polarimeter of Sagnac ring optical interference system, it is characterized in that primarily of light source, polarization maintaining optical fibre, first fiber coupler, the polarizer, second fiber coupler, optic fiber ring-shaped cavity, analyzer and photodetector are formed, wherein light source is connected with the first fiber coupler by polarization maintaining optical fibre with photodetector, first fiber coupler and the second fiber coupler are connected by polarization maintaining optical fibre and polarization maintaining optical fibre between the first fiber coupler and the second fiber coupler are provided with the polarizer and analyzer, second fiber coupler is connected with optic fiber ring-shaped cavity, the polarization maintaining optical fibre of this optic fiber ring-shaped cavity is provided with 1/4 slide along clockwise direction successively, absorption of sample pond, 1/4 slide and phase-modulator.
The utility model compared with prior art has the following advantages:
(1) by sagnac interferometry phase differential along the polarized light propagated clockwise and counterclockwise in circulation light path, thus obtain the angle of rotation of sample, be particularly suitable for weak angle of rotation and detect;
(2) the Sagnac ring interference of light system utilizing polarization maintaining optical fibre to build, solve the calibration of free space interference and the intrinsic difficulty of installation on the one hand, reduce volume, sensitivity is very high on the other hand, start very fast, strong interference immunity, and there is two-way reciprocity, thus improve the precision of measurement;
(3) use silica-based single-mode fiber to be coupled, light can be eliminated and propagate the interference of air turbulence and the sound wave brought in atmosphere and the change of the light path caused and the drift etc. of the instability caused and temperature.
Accompanying drawing explanation
Fig. 1 is light path principle figure of the present utility model.
Drawing illustrates: 1, light source, 2, polarization maintaining optical fibre, and the 3, first fiber coupler, 4, the polarizer, the 5, second fiber coupler, 6, optic fiber ring-shaped cavity, 7, analyzer, 8, photodetector, 9,1/4 slide, 10, absorption of sample pond, 11, phase-modulator.
Embodiment
Describe particular content of the present utility model by reference to the accompanying drawings in detail.Based on the polarimeter of Sagnac ring optical interference system, primarily of light source 1, polarization maintaining optical fibre 2, first fiber coupler 3, the polarizer 4, second fiber coupler 5, optic fiber ring-shaped cavity 6, analyzer 7 and photodetector 8 are formed, wherein light source 1 is connected with the first fiber coupler 3 by polarization maintaining optical fibre 2 with photodetector 8, first fiber coupler 3 and the second fiber coupler 5 are connected by polarization maintaining optical fibre 2 and polarization maintaining optical fibre 2 between the first fiber coupler 3 and the second fiber coupler 5 are provided with the polarizer 4 and analyzer 7, second fiber coupler 5 is connected with optic fiber ring-shaped cavity 6, the polarization maintaining optical fibre 2 of this optic fiber ring-shaped cavity 6 is provided with 1/4 slide 9 along clockwise direction successively, absorption of sample pond 10, 1/4 slide 9 and phase-modulator 11.
Principle of the present utility model, based on Sagnac ring optical interference effects, namely at the identical light of two bundle features that same closed light path sends from same light source, can converge to same sensing point after propagating with contrary direction.This optical interference system is all be made up of polarization maintaining optical fibre and its associated component.First, the super-radiance light emitting diode of a branch of 650nm length is as light source, enter into the first fiber coupler, enter in the second fiber coupler by the polarizer, after the second fiber coupler, light beam is divided into two bunch polarized lights, a branch ofly be transformed into circularly polarized light when being transmitted to quarter wave plate clockwise, by solution sample to be measured, by reverse quarter wave plate, circularly polarized light is transformed back into linearly polarized light again, light beam is in the counterclockwise direction consistent with the clockwise direction of propagation, converge at the second fiber coupler place two-beam, the left-handed rotation caused due to the optically-active characteristic of sample is different with the velocity of propagation of right-handed rotation, thus phase differential is created in two bundle polarized lights, along with the difference of solution concentration, phase differential also changes thereupon, the optically-active angle of solution can be drawn according to phase differential that is counterclockwise and clockwise light.
More than show and describe ultimate principle of the present utility model; principal character and advantage; under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall into claimed scope of the present utility model.
Claims (1)
1. based on the polarimeter of Sagnac ring optical interference system, it is characterized in that primarily of light source, polarization maintaining optical fibre, first fiber coupler, the polarizer, second fiber coupler, optic fiber ring-shaped cavity, analyzer and photodetector are formed, wherein light source is connected with the first fiber coupler by polarization maintaining optical fibre with photodetector, first fiber coupler and the second fiber coupler are connected by polarization maintaining optical fibre and polarization maintaining optical fibre between the first fiber coupler and the second fiber coupler are provided with the polarizer and analyzer, second fiber coupler is connected with optic fiber ring-shaped cavity, the polarization maintaining optical fibre of this optic fiber ring-shaped cavity is provided with 1/4 slide along clockwise direction successively, absorption of sample pond, 1/4 slide and phase-modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520141199.XU CN204439529U (en) | 2015-03-13 | 2015-03-13 | Based on the polarimeter of Sagnac ring optical interference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520141199.XU CN204439529U (en) | 2015-03-13 | 2015-03-13 | Based on the polarimeter of Sagnac ring optical interference system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204439529U true CN204439529U (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520141199.XU Expired - Fee Related CN204439529U (en) | 2015-03-13 | 2015-03-13 | Based on the polarimeter of Sagnac ring optical interference system |
Country Status (1)
| Country | Link |
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| CN (1) | CN204439529U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841047A (en) * | 2016-12-26 | 2017-06-13 | 杨虹 | A kind of honey quality detection method and device |
-
2015
- 2015-03-13 CN CN201520141199.XU patent/CN204439529U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841047A (en) * | 2016-12-26 | 2017-06-13 | 杨虹 | A kind of honey quality detection method and device |
| CN106841047B (en) * | 2016-12-26 | 2020-01-14 | 杨虹 | Honey quality detection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |