CN201589623U - Demodulation device for fiber grating sensors - Google Patents
Demodulation device for fiber grating sensors Download PDFInfo
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- CN201589623U CN201589623U CN2009203519950U CN200920351995U CN201589623U CN 201589623 U CN201589623 U CN 201589623U CN 2009203519950 U CN2009203519950 U CN 2009203519950U CN 200920351995 U CN200920351995 U CN 200920351995U CN 201589623 U CN201589623 U CN 201589623U
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- optical fiber
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- transmission grating
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Abstract
The utility model relates to a demodulation device for fiber grating sensors. The device comprises an optical box (7), a receiver (12), as well as a circuit system (8) connecting the optical box and the receiver, wherein the optical box (7) includes an optical fiber interface (1), a collimating lens (2), a first transmission grating (3), a second transmission grating (4), an aspherical mirror (5) and a photoelectric detector (6) which are arranged in sequence along the incidence direction of light beams; the aspherical mirror (5) adopts a convergent mirror; and the photoelectric detector (6) is connected with the receiver (12) through the circuit system (8). The demodulation device for fiber grating sensors provided by the utility model has the advantages that the two transmission gratings are adopted to enlarge the diffraction angle of diffracted light beams, thereby increasing the wavelength resolution of the demodulation device; and the device without moving components has rapid dynamic response, thereby achieving the applicability to high-frequency dynamic measurement.
Description
Technical field
The utility model relates to a kind of optical fiber sensor demodulation device.
Background technology
The variation of factor such as strain or temperature can cause fiber-optic grating sensor centre wavelength to change, because wavelength variable quantity has fixing relation with the variable quantity of these environmental parameters, therefore by surveying the measurement that wavelength variable quantity just can realize environmental parameter.The detection of wavelength variable quantity also is that demodulation is the core technology in the fiber grating sensing system, and general sensor-based system requires demodulating equipment to have the wavelength resolution and the tens nano level wavelength measurement scopes of micromicron magnitude.
At present, the widely used demodulation method that is based on tunable Fabery-Perot wave filter, but the dynamic scan frequency of this class wave filter is generally less than 200Hz, and its efficiency of light energy utilization is generally lower, signal to noise ratio (S/N ratio) is less, is unsuitable for feeble signal is detected.
With tunable optic filter relatively, based on optical fiber sensor demodulation device be not subjected to piezoelectrics restriction, do not have moving-member, higher to the utilization factor of luminous energy, can overcome the problem that tunable optic filter exists, grating carries out demodulation but the prior art optical fiber sensor demodulation device generally adopts monolithic light, its angle of diffraction is less, wavelength resolution is lower, is difficult to satisfy actual requirement.
The utility model content
The purpose of this utility model is: in order to solve the problem that prior art optical fiber sensor demodulation device angle of diffraction is less, wavelength resolution is lower, the utility model provides a kind of optical fiber sensor demodulation device with big angle of diffraction, upper wavelength resolution.
Technical solutions of the utility model are: a kind of optical fiber sensor demodulation device, it comprises optics box, receiver and the Circuits System that connects the two, wherein, comprise optical fiber interface, collimation lens, first transmission grating, second transmission grating, aspheric mirror and photodetector successively along light beam incident unwrapping wire in the described optics box, wherein, described aspheric mirror is a convergent mirror, and described photodetector links to each other in receiver by Circuits System.
Described photodetector is the InGaAs linear array detector.
Described receiver is an oscillograph.
Described first transmission grating and second transmission grating are the transmission-type diffraction grating, and the line number average is 1000 lines/mm.
The beneficial effects of the utility model are: compared with prior art, the reflected signal of fiber-optic grating sensor enters this demodulating equipment by optical fiber interface, by projecting on first transmission grating behind the collimation lens formation parallel beam, part diffraction light by first transmission grating projects on second transmission grating, part diffracted beam by second transmission grating is imaged on the photodetector by aspheric surface then, read image space by Circuits System again, and calculate wavelength value according to systematic parameter.The utility model optical fiber sensor demodulation device has increased the angle of diffraction of diffracted beam by adopting the double transmission grating, has improved the wavelength resolution of demodulating equipment, owing to do not have moving-member, dynamic response fast, can be applicable to the high frequency kinetic measurement simultaneously.
Description of drawings
Fig. 1 is the structural representation of the utility model optical fiber sensor demodulation device one better embodiment; Wherein, 1-optical fiber interface, 2-collimation lens, 3-first transmission grating, 4-second transmission grating, 5-aspheric mirror, 6-photodetector, 7-optics box, 8-Circuits System, 9-light beam, 10-long wavelength's light, 11-short wavelength light, 12-receiver.
Specific embodiments
See also Fig. 1, it is the structural representation of the utility model optical fiber sensor demodulation device one better embodiment.Described optical fiber sensor demodulation device comprises optics box, receiver and the Circuits System that connects the two.Wherein, described optics box 7 adopts the thermal expansivity materials with smaller to make, its inside sets gradually optical fiber interface 1, collimation lens 2, first transmission grating 3, second transmission grating 4, aspheric mirror 5, photodetector 6 along beam Propagation, and is fixed in the optics box 7 according to light path.In the present embodiment, described aspheric mirror 5 is reflective convergent mirror, and it can be with beam convergence to photodetector 6.Described first transmission grating 3 and second transmission grating 4 are the transmission-type diffraction grating, and the line number average is 1000 lines/mm, and photodetector 6 is the InGaAs linear array detector, and optics box 7 adopts the thermal expansivity materials with smaller.Simultaneously, described photodetector 6 links to each other with receiver 12 through Circuits System 8, and described receiver 12 is an oscillograph, is used for the demonstration to institute's receiving optical signal.
During optical fiber sensor demodulation device work, light beam enters this demodulating equipment by optical fiber interface 1, project on first transmission grating 3 after forming parallel beams by collimation lens 2,, light beam is deflected and project on second transmission grating 4 by the diffraction of first transmission grating 3.Then, by second transmission grating 4 light beam is carried out projecting aspheric mirror 5 behind the diffraction, be imaged on the photodetector 6 by aspheric mirror 5 then.Because first transmission grating 3 and second transmission grating 4 are diffraction grating, thus light beam by the time, the angle of diffraction difference of the light of different wave length, thus can be according to the wavelength size separately with the light of different wave length, thereby realize demodulation to light beam
In addition, adjust light path roughly by the infrared phenomena card, make the focus point of longer wavelength light 10 and the focus point of shorter wavelength light 11 be radiated at 6 two end points of photodetector respectively, the light focusing point of corresponding middle wave band is between 6 two end points of photodetector.Then, through calibration, can obtain the corresponding relation of wavelength of light and photodetector 6 picture dots; Realize data acquisition, transmission and the processing of photodetector 6 again by Circuits System 8, show by receiver 12 imagings again, can further calculate wavelength value then and according to calibrating parameters.
The utility model optical fiber sensor demodulation device makes the light angle of diffraction of different wave length obtain amplifying by first transmission grating and second transmission grating secondary diffraction to light beam, thereby with the light of different wave length separately, has effectively improved wavelength resolution.And because whole demodulating equipment inside all is relatively-stationary parts, movement-less part, so dynamic response is very fast, can be used for the high frequency kinetic measurement, therefore has bigger actual use value.
Claims (4)
1. optical fiber sensor demodulation device, it comprises optics box (7), receiver (12) and the Circuits System (8) that connects the two, it is characterized in that: comprise optical fiber interface (1), collimation lens (2), first transmission grating (3), second transmission grating (4), aspheric mirror (5) and photodetector (6) successively along light beam incident unwrapping wire in the described optics box (7), wherein, described aspheric mirror (5) is a convergent mirror, and described photodetector (6) links to each other with receiver (12) by Circuits System (8).
2. optical fiber sensor demodulation device according to claim 1 is characterized in that: described photodetector (6) is the InGaAs linear array detector.
3. optical fiber sensor demodulation device according to claim 2 is characterized in that: described receiver (12) is an oscillograph.
4. optical fiber sensor demodulation device according to claim 3 is characterized in that: described first transmission grating (3) and second transmission grating (4) are the transmission-type diffraction grating, and the line number average is 1000 lines/mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203519950U CN201589623U (en) | 2009-12-31 | 2009-12-31 | Demodulation device for fiber grating sensors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203519950U CN201589623U (en) | 2009-12-31 | 2009-12-31 | Demodulation device for fiber grating sensors |
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| CN201589623U true CN201589623U (en) | 2010-09-22 |
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| CN2009203519950U Expired - Lifetime CN201589623U (en) | 2009-12-31 | 2009-12-31 | Demodulation device for fiber grating sensors |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680140A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Method for measuring temperature of inflammable and explosive article based on optical fiber grating temperature sensor |
| CN102680139A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Fiber grating temperature sensing system for detecting temperatures of inflammables and explosives |
| CN108225388A (en) * | 2015-10-12 | 2018-06-29 | 北京信息科技大学 | A kind of FBG demodulating systems based on the scanning of linear array InGaAs photovoltaic arrays |
| CN108387251A (en) * | 2018-01-22 | 2018-08-10 | 大连理工大学 | A kind of fiber Bragg grating (FBG) demodulator device and method |
| CN108680193A (en) * | 2018-04-18 | 2018-10-19 | 中山水木光华电子信息科技有限公司 | A kind of optical fiber code recognition methods based on light splitting matrix demodulation |
| CN109682474A (en) * | 2018-12-27 | 2019-04-26 | 佛山科学技术学院 | Spectrometer dispersive elements and spectrometer |
| CN112525328A (en) * | 2020-11-30 | 2021-03-19 | 北京遥测技术研究所 | PSD-based fiber bragg grating vibration sensor demodulation system and method |
| CN115265782A (en) * | 2022-07-22 | 2022-11-01 | 上海如海仪器设备有限公司 | Double-grating folded light path fiber spectrometer |
-
2009
- 2009-12-31 CN CN2009203519950U patent/CN201589623U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680140A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Method for measuring temperature of inflammable and explosive article based on optical fiber grating temperature sensor |
| CN102680139A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Fiber grating temperature sensing system for detecting temperatures of inflammables and explosives |
| CN108225388A (en) * | 2015-10-12 | 2018-06-29 | 北京信息科技大学 | A kind of FBG demodulating systems based on the scanning of linear array InGaAs photovoltaic arrays |
| CN108387251A (en) * | 2018-01-22 | 2018-08-10 | 大连理工大学 | A kind of fiber Bragg grating (FBG) demodulator device and method |
| CN108680193A (en) * | 2018-04-18 | 2018-10-19 | 中山水木光华电子信息科技有限公司 | A kind of optical fiber code recognition methods based on light splitting matrix demodulation |
| CN109682474A (en) * | 2018-12-27 | 2019-04-26 | 佛山科学技术学院 | Spectrometer dispersive elements and spectrometer |
| CN112525328A (en) * | 2020-11-30 | 2021-03-19 | 北京遥测技术研究所 | PSD-based fiber bragg grating vibration sensor demodulation system and method |
| CN115265782A (en) * | 2022-07-22 | 2022-11-01 | 上海如海仪器设备有限公司 | Double-grating folded light path fiber spectrometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: AVIC CHANGCHENG METROLOGY + MEASUREMENT (TIANJIN) Free format text: FORMER OWNER: BEIJING CHANGCHENG INSTITUTE OF METROLOGY + MEASUREMENT, AVIATION INDUSTRY CORPORAATION OF CHINA Effective date: 20150104 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100095 HAIDIAN, BEIJING TO: 300457 HANGU, TIANJIN |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150104 Address after: 300457 science and Technology Park, room 80, Fourth Avenue, Tianjin economic and Technological Development Zone Patentee after: CATIC the Great Wall Measurement & Testing (Tianjin) Co., Ltd. Address before: 100095 Beijing, box No. 1066 Patentee before: Beijing Changcheng Institute of Metrology & Measurement, Aviation Industry Corporaation of China |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100922 |