CN201654405U - FBG demodulating system - Google Patents
FBG demodulating system Download PDFInfo
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- CN201654405U CN201654405U CN2010201410180U CN201020141018U CN201654405U CN 201654405 U CN201654405 U CN 201654405U CN 2010201410180 U CN2010201410180 U CN 2010201410180U CN 201020141018 U CN201020141018 U CN 201020141018U CN 201654405 U CN201654405 U CN 201654405U
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- fbg
- etalon
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- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims abstract description 20
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Abstract
The utility model discloses a FBG demodulating system which includes a FBG sensor, a FBG demodulating instrument and a computer; the FBG demodulating instrument includes a wideband light source, a Fabry- Perot filter, a light path coupler, a photoelectric detector, a high-stability etalon, a scanning voltage circuit, a signal modulating circuit and a data collection processing module; the wideband light source is connected with the Fabry- Perot filter; a spectral optical path includes a 1xN light path coupler and a plurality of 1x2 light path couplers; wherein a plurality of 1x2 light path couplers are respectively connected with the photoelectric detector; while one circuit of the 1xN light path coupler is connected with the high-stability etalon; the high-stability etalon is simultaneously connected with the light path detector; while the photoelectric detector is connected with the data collection processing module through the signal modulating circuit. The FBG demodulating system eliminates the influence caused by the creep properties and the hysteresis properties of the adjustable Fabry- Perot filter, and reaches better repeatability.
Description
Technical field
The utility model relates to a kind of optical fiber grating regulating system, especially relates to a kind of optical fiber grating regulating system that can strengthen measured value repeatability, is used for the automatic measurement field.
Background technology
In numerous industries of industrial circle, Fibre Optical Sensor is because its essential safety characteristic, be particularly suitable for Application in Sensing requirement inflammable, explosive, the strong-electromagnetic field place, can make things convenient for, accurately with effectively to the detection of relevant physical quantity in the especially various rugged surroundings of various environment, chemistry amount and biomass.The optical fiber information capacity is big, can prepare a plurality of even hundreds of sensing points on an optical fiber, and can carry out time division multiplex, wavelength-division multiplex, realizes distributed measurement and networked control.Little, the very thin softness of optical fiber own vol is specially adapted to the detection in some labyrinth spaces, also can imbed material, structural member and job facilities inside, realizes their state self diagnosis and does not damage its structure at its duration of work.By in optical fiber, forming the fiber-optic grating sensor that grating prepares, because its transducing signal is with wavelength-modulated, be not subjected to factor affecting such as light intensity, junction loss, thereby have high reliability, high sensitivity and a high precision, be easy to realize digitizing transmission or the like simultaneously, these sensing mechanism and characteristics of Fibre Optical Sensor make it can be widely used for fields such as heavy construction structure monitoring, electric power, water conservancy, oil, chemical industry, metallurgy, nuclear industry, defence and military.
The centre wavelength of fiber-optic grating sensor is temperature and the strain-dependent suffered with it usually, under the situation that is not subjected to stress, the centre wavelength of fiber grating only and temperature correlation, therefore according to this principle, as long as measure the centre wavelength of fiber-optic grating sensor, just temperature value be can calculate, therefore fiber-optical grating temperature sensor and fiber Bragg grating strain sensor fiber grating can be made into.
And optical fiber grating regulating system is usually by fiber-optic grating sensor, fiber Bragg grating (FBG) demodulator and computing machine are formed, core devices based on the optical fiber grating regulating system of adjustable fabry-perot filter principle is adjustable fabry-perot filter, the function of adjustable fabry-perot filter (Fabry-Perot wave filter) is: when a branch of broadband light incident F-P chamber, has only the narrow band light that satisfies certain condition by (spectrum width of this narrow band light is less than 0.3nm), the centre wavelength of transmitted spectrum is corresponding with the chamber appearance in F-P chamber, and the chamber in F-P chamber length is corresponding with driving voltage, therefore under different driven, the different narrow band light of centre wavelength is arranged by the F-P wave filter.But, because the structure of adjustable fabry-perot filter is made up of two blocks of glass parallel to each other or quartz plate, two lens and piezoelectrics, piezoelectrics have nonlinear characteristics such as creep properties and time stickiness, these features make measured value repeated very poor of wavelength just, though the velocity of propagation of light in optical fiber is very fast on the other hand, but in the optical fiber grating regulating system of long distance, fiber lengths still can not be ignored the influence of measured value.
The utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of can eliminate the influence of fiber lengths to measured value automatically, makes the optical fiber grating regulating system of measured value good reproducibility.
The utility model is achieved through the following technical solutions:
A kind of optical fiber grating regulating system, comprise fiber-optic grating sensor, fiber Bragg grating (FBG) demodulator and computing machine, wherein, fiber Bragg grating (FBG) demodulator connects a plurality of measurement passages, each is measured passage and is connected with a plurality of fiber-optic grating sensors, the fiber grating demodulation device then is connected with computing machine, it is characterized in that, described fiber Bragg grating (FBG) demodulator comprises wideband light source, fabry-perot filter, light path coupler, photodetector, the high stability etalon, the scanning voltage circuit, signal conditioning circuit and digital sampling and processing, wherein, wideband light source is connected with fabry-perot filter, fabry-perot filter is connected with a beam split light path, described beam split light path comprises 1 * N light path coupler and a plurality of 1 * 2 light path coupler, wherein, a plurality of 1 * 2 light path couplers are connected respectively to photodetector, wherein one tunnel light path of 1 * N light path coupler then links to each other with the high stability etalon, the high stability etalon links to each other with the light path detector simultaneously, and photodetector then is connected with digital sampling and processing by signal conditioning circuit.
The beneficial effects of the utility model are: the built-in high stability etalon of optical fiber grating regulating system described in the utility model, its wavelength is not subjected to the influence of environment substantially, and the wavelength coverage of this high stability etalon is very wide, can cover the wavelength coverage of 1525～1565nm fully, the utility model can be proofreaied and correct each measurement result simultaneously, thereby eliminated because the creep properties of adjustable fabry-perot filter and return the influence that stickiness caused makes the measured value reach good repeatability.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the utility model one embodiment;
Fig. 2 is the inner structure synoptic diagram of fiber Bragg grating (FBG) demodulator described in the utility model.
Main Reference numeral implication is among the figure:
1, computing machine 2, fiber Bragg grating (FBG) demodulator 3, fiber-optic grating sensor
21, fabry- perot filter 22,1 * N light path coupler, 23,1 * 2 light path coupler
24, high stability etalon 25, photodetector 26, signal conditioning circuit
27, digital sampling and processing 28, scanning voltage circuit 29, wideband light source
Embodiment
Below in conjunction with accompanying drawing, describe embodiment of the present utility model in detail:
Fig. 1 is the one-piece construction synoptic diagram of the utility model one embodiment.
As shown in Figure 1: optical fiber grating regulating system, comprise fiber-optic grating sensor 3, fiber Bragg grating (FBG) demodulator 2 and computing machine 1, wherein, a plurality of measurement passages are arranged on the fiber Bragg grating (FBG) demodulator 2, each is measured passage and is connected with several fiber-optic grating sensors 3, then is connected by the high-speed data communication interface between fiber Bragg grating (FBG) demodulator 2 and the computing machine 1.In addition, fiber Bragg grating (FBG) demodulator 2 can receiving computer 1 control command, its measurement data of respectively measuring passage can be sent to also that computing machine 1 is stored, calculating and graphic presentation etc., computing machine 1 has functions such as parameter setting, graphic presentation, graph demonstration, data computation, data form demonstration, data storage, data derivation and data warning, and measurement data refreshes once at regular intervals.
Fig. 2 is the inner structure synoptic diagram of fiber Bragg grating (FBG) demodulator described in the utility model.
As shown in Figure 2: described fiber Bragg grating (FBG) demodulator 2 comprises wideband light source 29, fabry-perot filter 21, light path coupler, photodetector 25, high stability etalon 24, scanning voltage circuit 28, signal conditioning circuit 26 and digital sampling and processing 27, wherein, wideband light source 29 is connected with fabry-perot filter 21, fabry-perot filter 21 is connected with a beam split light path, described beam split light path comprises 1 * N light path coupler 22 and a plurality of 1 * 2 light path coupler 23, wherein, a plurality of 1 * 2 light path couplers 22 are connected respectively to photodetector 25, wherein one tunnel light path of 1 * N light path coupler then links to each other with high stability etalon 24, high stability etalon 24 links to each other with light path detector 25 simultaneously, and photodetector 25 then is connected with digital sampling and processing 27 by signal conditioning circuit 26.
Wideband light source (ASE light source) is called amplification autoradiolysis light source again, it is based on the diode-end-pumped erbium-doped fiber and produces the spontaneous emission light principle, the wave spectrum scope 1525～1565nm of wideband light source, the function of adjustable Fabry one perot filter 21 (Fabry-Perot wave filter) is: when a branch of broadband light incident F-P chamber, has only the narrow band light outgoing (spectrum width of this narrow band light is less than 0.3nm) of satisfying certain condition, the centre wavelength of outgoing spectrum is corresponding with the chamber appearance in F-P chamber, and the chamber in F-P chamber length is corresponding with driving voltage, the narrow band light of the therefore different corresponding different centre wavelengths of driving voltage penetrates the F-P wave filter, above-mentioned scanning voltage circuit 28 provides the scanning voltage of specific waveforms for the F-P wave filter, 1 * N light path coupler 22 is 1 * 5 optical splitter, wherein one tunnel light path connects high stability etalon 24, the wave spectrum scope of this high stability etalon 24 has covered whole wave spectrum scopes of wideband light source, be spaced apart 100GHz between each crest, be 0.8nm, then at nearly 40 crests of 1525～1565nm scope, 1 * 2 light path coupler connects the measurement passage respectively, each reflected light of measuring passage is connected respectively to photodetector 25 through 1 * 2 light path coupler, the transmitted light of high stability etalon 24 also is connected to photodetector 25, the function of photodetector 25 is to carry out opto-electronic conversion, convert aanalogvoltage to through follow-up amplifying circuit, the effect of signal conditioning circuit 26 is I/V conversions, signal amplifies and filtering, and the function of digital sampling and processing 27 to be analog output voltages to signal conditioning circuit 26 carry out the A/D sampling, data storage, the voltage waveform of its gated sweep potential circuit 28 output appointments simultaneously, in addition, digital sampling and processing 27 carries out data communication by high-speed data communication interface and computing machine 1.
The built-in high stability etalon 24 of optical fiber grating regulating system of band fiber lengths correction, its wavelength is not subjected to the influence of environment substantially, and the wavelength coverage of this high stability etalon is very wide, can cover the wavelength coverage of 1525～1565nm fully, the utility model is all proofreaied and correct each measurement result, thereby eliminated because the creep properties of adjustable fabry-perot filter 21 and return the influence that stickiness caused has reached good repeatability.
Below disclose the utility model with preferred embodiment, so it is not in order to restriction the utility model, and all employings are equal to replaces or technical scheme that the equivalent transformation mode is obtained, all drops within the protection domain of the present utility model.
Claims (1)
1. optical fiber grating regulating system, comprise fiber-optic grating sensor, fiber Bragg grating (FBG) demodulator and computing machine, wherein, fiber Bragg grating (FBG) demodulator connects a plurality of measurement passages, each is measured passage and is connected with a plurality of fiber-optic grating sensors, the fiber grating demodulation device then is connected with computing machine, it is characterized in that, described fiber Bragg grating (FBG) demodulator comprises wideband light source, fabry-perot filter, light path coupler, photodetector, the high stability etalon, the scanning voltage circuit, signal conditioning circuit and digital sampling and processing, wherein, wideband light source is connected with fabry-perot filter, fabry-perot filter is connected with a beam split light path, described beam split light path comprises 1 * N light path coupler and a plurality of 1 * 2 light path coupler, wherein, a plurality of 1 * 2 light path couplers are connected respectively to photodetector, wherein one tunnel light path of 1 * N light path coupler then links to each other with the high stability etalon, the high stability etalon links to each other with the light path detector simultaneously, and photodetector then is connected with digital sampling and processing by signal conditioning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410180U CN201654405U (en) | 2010-03-24 | 2010-03-24 | FBG demodulating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201410180U CN201654405U (en) | 2010-03-24 | 2010-03-24 | FBG demodulating system |
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| CN201654405U true CN201654405U (en) | 2010-11-24 |
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| CN2010201410180U Expired - Lifetime CN201654405U (en) | 2010-03-24 | 2010-03-24 | FBG demodulating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235882A (en) * | 2011-03-29 | 2011-11-09 | 徐峻锋 | Self-calibration optical fiber sensing analyzer |
| CN115951364A (en) * | 2022-12-23 | 2023-04-11 | 南京理工大学 | Method for improving positioning precision of piezoelectric type quick steering mirror platform |
-
2010
- 2010-03-24 CN CN2010201410180U patent/CN201654405U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235882A (en) * | 2011-03-29 | 2011-11-09 | 徐峻锋 | Self-calibration optical fiber sensing analyzer |
| CN115951364A (en) * | 2022-12-23 | 2023-04-11 | 南京理工大学 | Method for improving positioning precision of piezoelectric type quick steering mirror platform |
| CN115951364B (en) * | 2022-12-23 | 2024-03-12 | 南京理工大学 | Method for improving positioning accuracy of piezoelectric type rapid steering mirror platform |
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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: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE NANJ Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20130709 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE Effective date: 20130709 |
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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: 210003 NANJING, JIANGSU PROVINCE TO: 100031 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130709 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: State Grid Electric Power Research Insititute Patentee after: Nanjing Nari Co., Ltd. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee before: State Grid Electric Power Research Insititute Patentee before: Nanjing Nari Co., Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20171123 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: State Grid Electric Power Research Insititute Patentee after: State Grid Corporation of China Co-patentee after: NARI Technology Development Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: State Grid Electric Power Research Insititute Patentee before: State Grid Corporation of China Co-patentee before: Nanjing Nari Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101124 |
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| CX01 | Expiry of patent term |