CN100335876C - Passive light splitting offset detector - Google Patents
Passive light splitting offset detector Download PDFInfo
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- CN100335876C CN100335876C CNB2004100336146A CN200410033614A CN100335876C CN 100335876 C CN100335876 C CN 100335876C CN B2004100336146 A CNB2004100336146 A CN B2004100336146A CN 200410033614 A CN200410033614 A CN 200410033614A CN 100335876 C CN100335876 C CN 100335876C
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- optical fiber
- spectroscope
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- polarizer
- collimator
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Abstract
The present invention relates to a passive light splitting offset detector which belongs to the technical field of photoelectrons. The present invention comprises a base and a T-shaped light path which is composed of fourth collimators, a polarizer, spectroscopes and a Wollaston prism, wherein the horizontal light path is composed of the first collimator, the polarizer, the spectroscope and the second collimator which are all sequentially arranged; the vertical light path is composed of the spectroscope, the Wollaston prism, the third collimator and the fourth collimator. The present invention has the advantages of simple and compact structure, small size, low cost, high stability, easy connection with an optical fiber system, etc.
Description
Technical field
The invention belongs to the photoelectron technology field, the design of passive minute light analyzer of particularly a kind of optical passive component.
Background technology
The detection of polarization state be in the high speed optical fiber communication research of polarization mode dispersion and polarization state modulation fiber sensor and use in key issue.Traditional polarization state detection method is quite ripe, and main implementation method is with the discrete installations of element such as polaroid, spectroscope, quarter wave plate, electro-optic crystal and GRIN Lens, bonding or optical waveguide is passive is in the same place.Be fixed to mode on the experiment table by discrete component, the system bulk that this mode constitutes is big, debugging and collimation difficulty, poor stability, can't practical application in engineering; If adopt the mode that all elements are bonded together, can improve the stability and the mobility of system, but the bonding encapsulation of optical system is relatively more difficult, poor heat stability; The integrated method of optical waveguide generally is used for being similar to dedicated system such as integrated optics voltage sensor, and the polarization state detecting unit can not independently use, and its range of application is very limited.In addition, because the electro-optic crystal that said system comprises is an active device, electrooptical modulation has increased the complicacy of system and has made the application variation.
Summary of the invention
The objective of the invention is to for overcoming the weak point of prior art, a kind of passive minute light analyzer that constitutes based on optical passive component proposed, have simple in structure, compact, volume is little, cost is low, stability is high, be easy to and advantages such as fibre system is connected, and is specially adapted in optical fiber communication or the optical fiber sensing technology measurement to polarization state.
Passive minute of the present invention light analyzer, comprise by pedestal and be installed on this pedestal by four collimating apparatuss, the polarizer, spectroscope and Lars, the room T type light path that prism forms of pausing, wherein, horizontal optical path is made up of first collimating apparatus that sets gradually, polarizer, spectroscope and second collimating apparatus, and vertical optical path is made up of pause prism, the 3rd collimating apparatus and the 4th collimating apparatus of spectroscope, Lars, room.
Four collimating apparatuss of the present invention can adopt optical fiber collimator or the GRIN Lens that has tail optical fiber.
Principle of work of the present invention is: the laser that is sent by the light source of outer application system is converted to directional light by first collimating apparatus of input end, this directional light becomes linearly polarized light after by the polarizer, through being divided into the two-beam that light intensity equates after spectroscope reflection and the transmission, reflected light overflow (need not), transmitted light is received and is transferred in the outer application system by second collimating apparatus, outer application system changes polarization state, and this light that changes got back to the light path of the present invention from second collimating apparatus transmission, reflected and transmission by spectroscope equally, major part is depleted transmitted light because polarization state is different with the polarization direction of the polarizer by the polarizer time, reflected light incides the Lars, room and pauses in the prism, utilize the branch light action of prism to be divided into the two-beam of polarization state quadrature, incide respectively be used to export the 3rd, in the 4th collimating apparatus, and by two photo-detectors receptions of outer application system, the photosignal that converts to obtains the information that polarization state changes by follow-up signal processing unit processes.
Characteristics of the present invention and technique effect:
One, simple and compact for structure, volume is little, cost is low, easy practicability, can be applied to less or irregular space in.
Two, can produce the product of seriation easily, with different situations and the requirement that adapts to application system.
Two, if adopt optical fiber collimator, then can be connected with the fiber optic applications system easily, owing to can use optical fiber or optical cable, the light signal that carries relevant information can be by Optical Fiber Transmission in the sensor away from the scene, signal Processing also can be carried out at far-end, can be reduced to very little with adverse influence in the applied environment (as high temperature, high pressure and corrosive environment).The present invention simultaneously is that the passive device in-site measurement is not charged, relatively safety.
Description of drawings
Fig. 1 is an embodiments of the invention general structure synoptic diagram.
Fig. 2 is a kind of Application Example general structure synoptic diagram of the present invention.
Embodiment
Passive minute light analyzer of the present invention's design reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
Passive minute light analyzer example structure of the present invention's design as shown in Figure 1, comprise by pedestal 6 and be installed on this pedestal by four optical fiber collimators, the polarizer, spectroscope and Lars, the room T type light path that prism is formed of pausing, wherein, horizontal optical path is by first optical fiber collimator 21 that has tail optical fiber 211 that sets gradually, polarizer 3, spectroscope 4 is formed with second optical fiber collimator 22 that has tail optical fiber 221, and vertical optical path is by spectroscope 4, pause prism 5 (Wollaston) Lars, room, the 3rd optical fiber collimator 23 that has tail optical fiber 231 is formed with the 4th optical fiber collimator 24 that has tail optical fiber 241.Wherein, optical fiber collimator 21 input beams are received by optical fiber collimator 22 by polarizer 3 and spectroscope 4 backs successively, and the input beam of optical fiber collimator 22 is received by optical fiber collimator 23 and optical fiber collimator 24 respectively behind spectroscope 4 reflections pausing by the Lars, room again prism 5; Pedestal is a right cylinder, have pilot hole at upper surface with the precision machined method of optics, each used for optical elements mechanical mode is fixed in the pilot hole, four optical fiber collimators are distributed in around the pedestal, the light path that the tail optical fiber of each optical fiber collimator is used between the present invention and the external fiber system connects, the polarizer, spectroscope and Lars, the room prism location of pausing is distributed in the center of pedestal, is used to realize the conversion of polarized light.
Principle of work of the present invention is: the laser that is sent by light source is input to optical fiber collimator 21 and is converted to directional light by the tail optical fiber of first optical fiber collimator 21, this directional light becomes linearly polarized light after by the polarizer 3, through being divided into the two-beam that light intensity equates after spectroscope 4 reflections and the transmission, reflected light overflow (need not), transmitted light is received by second optical fiber collimator 22 and is transferred in the outside fibre system by its tail optical fiber, this fibre system changes polarization state, and the tail optical fiber of this light that changes from this optical fiber collimator transmitted back the light path of the present invention, reflected and transmission by spectroscope 4 equally, major part is depleted transmitted light because polarization state is different with the polarization direction of the polarizer by the polarizer 3 time, reflected light incides the Lars, room and pauses in the prism 5, utilize the branch light action of prism 5 to be divided into the two-beam of polarization state quadrature, incide two optical fiber collimators 23 that are used to export respectively, in 24, and be connected to optical fiber collimator 23, the photo-detector of two magnetic tape trailer fibres on 24 tail optical fibers receives, the photosignal that converts to obtains the information that polarization state changes by follow-up signal processing unit processes.
Each element of present embodiment all can adopt conventional products, now is described in detail as follows for example:
Pedestal is a right cylinder, diameter is 50mm, have pilot hole at upper surface with the precision machined method of optics, each used for optical elements mechanical mode is fixed in the pilot hole, four optical fiber collimators are distributed in around the pedestal, the light path that the tail optical fiber of each optical fiber collimator is used between the present invention and the external fiber system connects, and the polarizer, spectroscope and Lars, the room prism location of pausing is distributed in the center of pedestal, is used to realize the conversion of polarized light.
Use the present invention and can constitute a kind of novel full fiber reflection formula current transformer that is used for, its structure as shown in Figure 2, constitute by detecting light path and signal processing unit 100 and fiber-optic sensor probe 200, detect light path and signal processing unit 100 by passive minute light analyzer 1, long period fiber grating 101, fiber coupler 1020 and 1021, wide spectrum light source 103, optical filter 104, photodetector 1050,1051,1052 and DSP signal processing unit 106 (can be arranged on far-end) constitute, fiber-optic sensor probe 200 can be arranged on far-end, by sensor fibre coil 201, converging wires 202, Fiber Bragg Grating FBG 203 and faraday rotator mirror 204 constitute.
The course of work of this current transformer is:
The light that is sent by wide spectrum light source 103 is input to after fiber coupler 1020 and long period fiber grating 101 in the passive minute light analyzer 1 of magnetic tape trailer fibre, through optical fiber collimator 21, polarizer 3 and spectroscope 4, optical fiber collimator 22, be input to sensor fibre coil 201 by polarization maintaining optical fibre 221 again, the light of this part carries measuring-signal and gets back to after faraday rotator mirror 204 reflection in passive minute light analyzer 1, pass through spectroscope 4 again, pause prism 5 and optical fiber collimator 23 and 24 of Lars, room is coupled in the photodetector 1050 and 1051 of the magnetic tape trailer fibre that is attached thereto, obtain corresponding two orthogonal directions polarization light intensities, thereby obtain the measuring-signal that is directly proportional with electric current.Another part light by fiber coupler 1020 outputs is input in the temperature sensing Fiber Bragg Grating FBG 203 through fiber coupler 1021, received by photodetector 1052 after the light process coupling mechanism 1021 of the certain wavelength of temperature sensing Fiber Bragg Grating FBG 203 reflections and optical filter 104 filtering, measured temperature value is used for the temperature correction of optical fiber V erdet constant.Photodetector 1050,1051,1052 data of surveying are after DSP signal processing unit 106 output metering and guard signals.
The light path of the above each several part and circuit are and illustrate technical characterictic of the present invention, not in order to limiting protection scope of the present invention, allly all should belong to protection scope of the present invention to this corresponding change of doing.
Claims (2)
1, a kind of passive minute light analyzer, it is characterized in that, comprise by pedestal and be installed on this pedestal by four collimating apparatuss, the polarizer, spectroscope and Lars, the room T type light path that prism forms of pausing, wherein, horizontal optical path is made up of first collimating apparatus that sets gradually, the polarizer, spectroscope and second collimating apparatus, and vertical optical path is made up of pause prism, the 3rd collimating apparatus and the 4th collimating apparatus of spectroscope, Lars, room.
2, passive minute as claimed in claim 1 light analyzer is characterized in that, said four collimating apparatuss adopt optical fiber collimator or the GRIN Lens that has tail optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100336146A CN100335876C (en) | 2004-04-13 | 2004-04-13 | Passive light splitting offset detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100336146A CN100335876C (en) | 2004-04-13 | 2004-04-13 | Passive light splitting offset detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1563915A CN1563915A (en) | 2005-01-12 |
| CN100335876C true CN100335876C (en) | 2007-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100336146A Expired - Fee Related CN100335876C (en) | 2004-04-13 | 2004-04-13 | Passive light splitting offset detector |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101271024B (en) * | 2007-03-21 | 2010-10-13 | 中国科学院高能物理研究所 | Synchrotron radiation X-ray multilayer film synthetic polarization measuring apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536088A (en) * | 1982-09-17 | 1985-08-20 | Rashleigh Scott C | Polarimetric Fabry-Perot sensor |
| JPH06147988A (en) * | 1992-11-05 | 1994-05-27 | Shimadzu Corp | Polarized light measuring instrument |
| JP2000081386A (en) * | 1999-09-22 | 2000-03-21 | Matsushita Electric Ind Co Ltd | Angle-of-rotation measurement method and concentration measurement method |
| US6275291B1 (en) * | 1998-09-16 | 2001-08-14 | Nanophotonics Ag | Micropolarimeter and ellipsometer |
| JP2003337068A (en) * | 2002-04-10 | 2003-11-28 | Tektronix Japan Ltd | Calibration method of polarimeter |
-
2004
- 2004-04-13 CN CNB2004100336146A patent/CN100335876C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536088A (en) * | 1982-09-17 | 1985-08-20 | Rashleigh Scott C | Polarimetric Fabry-Perot sensor |
| JPH06147988A (en) * | 1992-11-05 | 1994-05-27 | Shimadzu Corp | Polarized light measuring instrument |
| US6275291B1 (en) * | 1998-09-16 | 2001-08-14 | Nanophotonics Ag | Micropolarimeter and ellipsometer |
| JP2000081386A (en) * | 1999-09-22 | 2000-03-21 | Matsushita Electric Ind Co Ltd | Angle-of-rotation measurement method and concentration measurement method |
| JP2003337068A (en) * | 2002-04-10 | 2003-11-28 | Tektronix Japan Ltd | Calibration method of polarimeter |
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| CN1563915A (en) | 2005-01-12 |
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