CN202067057U - Demodulation device for wavelength of fiber grating - Google Patents
Demodulation device for wavelength of fiber grating Download PDFInfo
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- CN202067057U CN202067057U CN2011201438886U CN201120143888U CN202067057U CN 202067057 U CN202067057 U CN 202067057U CN 2011201438886 U CN2011201438886 U CN 2011201438886U CN 201120143888 U CN201120143888 U CN 201120143888U CN 202067057 U CN202067057 U CN 202067057U
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Abstract
The utility model relates to a demodulation device for the wavelength of fiber grating, which adopts the structure that a scanning light source is connected with a circulator, the circulator is connected with the fiber grating, a photoelectric conversion and signal amplification processing module is connected to the circulator to receive light signals reflected by the fiber grating; the photoelectric conversion and signal amplification processing module is connected with a differentiation zero-crossing detection module and a comparison module respectively, the differentiation zero-crossing detection module and the comparison module are connected with a data processing module respectively, the data processing module is connected to an adjustable benchmark module, and the adjustable benchmark module is connected to the comparison module for providing the comparison module with benchmark value for the comparison. The demodulation device solves the fiber grating side peak process problem and large data operation amount problem.
Description
Technical field
The utility model relates to sensory field of optic fibre, specially refers to a kind of demodulating equipment that based on scanning light source the fiber grating signal is carried out Wavelength demodulation in fiber-optic probe.
Background technology
Fiber-optic grating sensor is subjected to the effect of external temperature or power, can cause the variation or the variation in grating cycle of grating region effective refractive index, thereby changes the reflection wavelength of fiber grating.Fiber grating sensing system is realized measurement to various physical quantitys by the detection to reflection wavelength.The fiber grating demodulation technology is a technology very crucial in the fiber grating sensing system, measuring optical fiber grating reflection wavelength characteristic, and its characterisitic parameter is demodulated to the value of the physical quantity of surveying.
At present, the fiber grating demodulation technology mainly contains: (1) employing wideband light source and tunable fiber F-P wave filter carry out filter scan to the reflectance spectrum of sensing grating, and these demodulation techniques exist high-precision tunable Fabry Perot chamber price higher; (2) the light spectrum image-forming technology that adopts dispersion element and ccd array to combine is carried out wavelength analysis, and these demodulation techniques can only realize the single channel measurement, and resolution is not high; (3) adopt coupling grating filter method that the sensor fibre grating is carried out Wavelength demodulation, this demodulation method is simple in structure, cost is low but precision is not high.(4) adopt the edge filter method that fiber grating is carried out Wavelength demodulation, these demodulation techniques require the edge of demodulator filter very steep, and good linearity requires each parameters of operating part of system stable, and precision is not high.Wherein, tunable fiber F-P filter method demodulation techniques are widely used in the optical fiber grating sensing field.
But in the above-mentioned demodulation method based on fiber F-P tuned filter technology, cardinal principle is to adopt AD conversion image data, and the amount of data is big, and especially sweep frequency reaches 1KHz or when above, the amount of data processing is very big, to the speed of AD collection and the transmission requirement height of whole data.Thereby it is very high to cause equipment that data are handled and program design to require, and the work of treatment amount is big, and treatment effect is undesirable, and inefficiency.
The utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of demodulating equipment of new optic fiber grating wavelength is provided.The demodulating equipment of the utility model optic fiber grating wavelength need solve the handling problem at peak, fiber grating limit, also will solve the excessive problem of data operation quantity simultaneously.
In order to reach above-mentioned utility model purpose, it is as follows that the utility model is provided by the technical scheme that provides:
A kind of demodulating equipment of optic fiber grating wavelength is characterized in that, this demodulating equipment includes:
Scanning light source is connected to circulator, for demodulating equipment provides scanning light source;
Circulator is connected to fiber grating and opto-electronic conversion and signal processing module respectively, is used for coupling, the distribution of light signal;
Opto-electronic conversion and signal processing and amplifying module, be connected to circulator, be used to receive the light signal that fiber grating reflects, and the light signal that receives carried out opto-electronic conversion and signal processing and amplifying, divide two-way output with the data after the processing and amplifying: the one tunnel is connected with differential zero passage detection module, and another road is connected with comparison module;
Differential zero passage detection module, be connected to opto-electronic conversion and signal processing and amplifying module and data processing module respectively, be used to receive a circuit-switched data from opto-electronic conversion and the output of signal processing and amplifying module, and the data that receive are carried out the differential zero passage detection handle, result is exported to data processing module;
Comparison module, be connected to opto-electronic conversion and signal processing and amplifying module, data processing module and adjustable reference module respectively, be used to receive another circuit-switched data from opto-electronic conversion and the output of signal processing and amplifying module, and the benchmark numerical value of the data that receive and the output of adjustable reference module compared, comparative result is exported to data processing module;
Data processing module, this data processing module are connected to differential zero passage detection module, comparison module and adjustable reference module respectively, handle the wavelength result who obtains reflecting in the fiber grating in the data processing module, and data processing module is connected to the adjustable reference module;
The adjustable reference module, be connected to comparison module and data processing module, be used to receive the regulating command of data processing module output, regulate the benchmark numerical value that the adjustable reference module is exported to comparison module, for comparison module provides benchmark numerical value, the opposite side peak screens in comparison module, obtains the wavelength of different numbers, until filtering out effective optic fiber grating wavelength.
In demodulating equipment of the present utility model, described scanning light source or be scan laser source or the scanning light source that after tunable optic filter filtering, produces for wideband light source.
In demodulating equipment of the present utility model, described data processing module is MCU, CPU, FPGA, DSP or CPLD.
In demodulating equipment of the present utility model, the passage of measuring optical fiber grating is not limited to single passage, is more than 2 passages reach.The output terminal of scanning light source connects a shunt in the improved demodulating equipment, these shunt output at least two bundle scan light signals, the passage that every bundle scan light signal forms to a circulator respectively, also include fiber grating, opto-electronic conversion and signal processing module, differential zero passage detection module, comparison module and adjustable reference module in this passage, the shared data processing module of data processing in a plurality of passages.
Based on technique scheme, the demodulating equipment of optic fiber grating wavelength of the present utility model is compared with the method for prior art and device has following technological merit:
1. the utility model proposes in fiber grating centre wavelength demodulating process for the grating waveform peak and detect and the new solution of processing hardware at peak, limit, realized effective screening, solved the big drawback of Back end data treatment capacity grating centre wavelength.
2. the demodulating equipment of utility model of the present invention need not the data processing of AD collection fast and computing complexity, only just filtered a large amount of invalid signals by hardware, make that the data of gathering are authentic and valid, and the treatment capacity of these True Datas is little, processing procedure is also simple relatively.
Description of drawings
The structure connection diagram of the demodulating equipment of Fig. 1 the utility model optic fiber grating wavelength.
Fig. 2 is the synoptic diagram that obtains fiber grating band edge peak after opto-electronic conversion and signal amplify in the demodulating equipment of the present utility model.
Fig. 3 is the differential map of Fig. 2.
The pulse output synoptic diagram that Fig. 4 obtains after the differential zero passage detection for band edge peak fiber grating signal.
Fig. 5 is a kind of pulse synoptic diagram that does not filter the peak, limit of output behind comparison module.
Fig. 6 is the pulse synoptic diagram of comparison module peak, output filtering limit information after regulating benchmark.
Fig. 7 is the structural representation of embodiment 2 in the utility model.
Embodiment
Below we come the demodulating equipment of optic fiber grating wavelength of the present utility model done further with specific embodiment in conjunction with the accompanying drawings and elaborate; form and the course of work in the hope of understand structure of the present utility model more cheer and brightly, but can not limit protection domain of the present utility model with this.
As shown in Figure 1, the demodulating equipment of optic fiber grating wavelength of the present utility model includes following structure: scanning light source 1, fiber grating 3, circulator 2, opto-electronic conversion and signal processing and amplifying module 4, differential zero passage detection module 5, comparison module 6, data processing module 8 and adjustable reference module 7.Wherein, the output terminal of this scanning light source 1 connects a circulator 2, on circulator 2, be connected to fiber grating 3, this fiber grating 3 is to opposite direction reflected light signal, this reflected light is connected with opto-electronic conversion and signal processing and amplifying module 4 by circulator 2, this opto-electronic conversion and signal processing and amplifying module 4 are provided with two output ports, two output ports are connected to respectively on differential zero passage detection module 5 and the comparison module 6, differential zero passage detection module 5 and comparison module 6 are all exported result and are handled to data processing module 8, comparison module 6 also is connected with adjustable reference module 7, and data processing module 8 is connected to adjustable reference module 7.
In the middle of above-mentioned structure connected, the conveying relation of photoelectricity and digital signal was as follows in each structure was formed:
Scanning light source, light source to one circulator that this scanning light source is exported, on circulator, be connected to fiber grating, this fiber grating is to opposite direction reflected light signal, the circulator here also can be a shunt, the effect that they play is identical, all is the light of fiber grating reflection is exported from the another port.
Opto-electronic conversion and signal processing and amplifying module, this opto-electronic conversion and signal processing and amplifying module are connected on the circulator to receive reflected light, reflected light is carried out the go forward side by side processing and amplifying of line data of opto-electronic conversion, what amplification obtained is the simulating signal of scanning optical spectrum, and the data after the above-mentioned amplification are divided two-way output.
Differential zero passage detection module, this differential zero passage detection module connects opto-electronic conversion and signal processing module to receive one tunnel data after amplifying, the pulse signal that includes grating spectrum peak and peak position, limit information in these data, differential zero passage module is carried out the processing of differential zero passage to data exactly, and result inputs to data processing module.
Comparison module, this comparison module is connected in the photoelectric conversion signal processing module to receive one tunnel data after amplifying, the initial value that receives in data that receive and the comparison module compares, comparative result inputs to data processing module, and described initial value offers comparison module by the adjustable reference module.
Data processing module, this data processing module is connected to differential zero passage module and comparison module respectively, handles the wavelength result who obtains feedback spectrum in the fiber grating in the data processing module, and data processing module is connected to the adjustable reference module.The data processing module here is MCU, CPU, FPGA, DSP or CPLD.Wherein, MCU (Micro Control Unit) Chinese is a micro-control unit, CPU(Central Processing Unit) Chinese is a central processing unit, FPGA(Field-Programmable Gate Array) Chinese is a programmable gate array, DSP (Digital Signal Processing, abbreviation) Chinese is a digital signal processor, and CPLD (Complex Programmable Logic Device) Chinese is a CPLD.
The adjustable reference module, this adjustable reference module one end connects comparison module so that initial value to be provided, the other end connects data processing module to receive the instruction of regulating numerical value, adjusting is by the reference value of adjustable reference comparison module that module offers, the opposite side peak screens in comparison module, obtain the wavelength of different numbers, until the effective optic fiber grating wavelength of screening.
In the utility model, send the light source of narrowband wavelength scanning by scanning light source 1, the scanning narrow-band light source that this light source can produce behind tunable optic filter for wideband light source, it perhaps directly is a scanned laser, by inciding fiber grating 3 behind the circulator 2, fiber grating enters into opto-electronic conversion and signal processing and amplifying module 4 with the scan light of incident behind former road reflected back circulator 2, the signal that obtains is seen shown in Figure 2, and Fig. 2 is the synoptic diagram that obtains fiber grating band edge peak in the demodulating equipment of the present utility model after opto-electronic conversion and the signal processing and amplifying.Among this figure except the original central wavelength lambda of fiber grating
0Also have peak, limit λ outward,
' 0
Signal among above-mentioned Fig. 2 is divided into two-way: one road signal is sent to differential zero passage detection module 5.If received signal is f (t) in the differential zero passage detection module, then 5 pairs of these received signals of differential zero passage detection module are carried out differential, obtain differential signal
Wherein, A is a constant relevant with circuit structure.Then, in differential zero passage detection module 5, resulting differential signal and a fixed level are compared, thereby with the grating spectrum signal transition that scanning obtains is the pulse signal that comprises fiber grating peak and peak position, limit information, this pulse as shown in Figure 4, the pulse signal that obtains is conveyed into data processing module 8.
Another road signal is sent to comparison module 6 among Fig. 2, regulates different benchmarks by adjustable reference module 7, can export the signal of shape such as Fig. 5 or Fig. 6.Then the result also is sent in the data processing module 8, wherein, has comprised the information at peak, limit in the signal among Fig. 5, and be to have filtered the limit peak-to-peak signal among Fig. 6.
In data processing module 8, photoelectric conversion signal and signal processing and amplifying module 4 one tunnel are obtained oscillogram 4 after differential zero passage detection module 5, another road obtains Fig. 5 waveform behind comparison module 6, Fig. 5 waveform and Fig. 4 waveform are carried out logic and operation in the logical operation, obtained containing the pulse preface figure of peak, limit information, data processing is carried out time series analysis to the pulse sequence figure that obtains and can have been obtained the spike long value and export the result.
Simultaneously, number according to resulting wavelength from data processing module 8, regulate the reference value of adjustable reference module 7 by data processing module 8, thereby the output waveform that makes comparison module 6 as shown in Figure 6, same and Fig. 4 waveform carries out the logic and operation in the logical operation, has obtained filtering the pulse sequence at peak, limit, reaches the screening at opposite side peak, the effective optic fiber grating wavelength that in data processing module 8, obtains, the just demodulation result of demodulating equipment of the present utility model.
Embodiment 2
Handle for 2 passages, referring to Fig. 7, wherein 9 is shunt, and the light that scanning light source 1 is come out is divided into 2 the tunnel, the one tunnel and delivers to circulator 2
1Passage, also include fiber grating 3 in this passage
1, opto-electronic conversion and signal processing and amplifying module 4
1, differential zero passage detection module 5
1, comparison module 6
1, data processing module 8 and adjustable reference module 7
1Circulator 2 is delivered on another road
2Passage, also include fiber grating 3 in this passage
2, opto-electronic conversion and signal processing and amplifying module 4
2, differential zero passage detection module 5
2, comparison module 6
2, data processing module 8 and adjustable reference module 7
2, scanning light source 1 and data processing module 8 in Fig. 1 are the common sparing, different the distinguishing with subscript of all the other function same channels, the same passage of the expression that subscript is identical.If more than two passages, shunt 9 can be divided into multichannel equally, other no longer repeat.
A kind of optic fiber grating wavelength demodulation method of the present utility model belongs to the Fibre Optical Sensor measuring technique based on differential zero passage detection technology.It has proposed in fiber grating centre wavelength demodulating process to detect and the new solution of processing hardware at peak, limit for the grating waveform peak, has realized the effective screening to grating centre wavelength, has solved the big drawback of Back end data treatment capacity.
Claims (5)
1. the demodulating equipment of an optic fiber grating wavelength is characterized in that, this demodulating equipment includes:
Scanning light source, this scanning light source output is connected to a circulator, is connected to fiber grating on circulator;
Circulator is connected to fiber grating and opto-electronic conversion and signal processing module respectively with coupling, distribution light signal;
Opto-electronic conversion and signal processing and amplifying module, be connected to circulator to receive the light signal that fiber grating reflects, and the light signal that receives carried out opto-electronic conversion and signal processing and amplifying, divide two-way output with the data after the processing and amplifying: the one tunnel is output in the differential zero passage detection module of connection, and another road is output in the comparison module of connection;
Differential zero passage detection module, be connected to opto-electronic conversion and signal processing and amplifying module and data processing module respectively, differential zero passage detection module receives the circuit-switched data from opto-electronic conversion and the output of signal processing and amplifying module, and the data that receive are carried out exporting to data processing module after the differential zero passage detection is handled;
Comparison module, be connected to opto-electronic conversion and signal processing and amplifying module, data processing module and adjustable reference module respectively, comparison module receives another circuit-switched data from opto-electronic conversion and the output of signal processing and amplifying module, and the benchmark numerical value of the data that receive and the output of adjustable reference module compared, comparative result is exported to data processing module;
Data processing module, this data processing module are connected to differential zero passage detection module, comparison module and adjustable reference module respectively, handle the wavelength result who obtains reflecting in the fiber grating in the data processing module, and data processing module is connected to the adjustable reference module;
The adjustable reference module is connected to comparison module and data processing module, and receives the regulating command of data processing module output, and the adjustable reference module provides benchmark numerical value for comparison module.
2. the demodulating equipment of a kind of optic fiber grating wavelength according to claim 1 is characterized in that, described scanning light source or be scan laser source or the scanning light source that produces for wideband light source after tunable optic filter filtering.
3. the demodulating equipment of a kind of optic fiber grating wavelength according to claim 1 is characterized in that, described data processing module is MCU, CPU, FPGA, DSP or CPLD.
4. the demodulating equipment of a kind of optic fiber grating wavelength according to claim 1 is characterized in that, the passage of measuring optical fiber grating is not limited to single passage, can be 2 passages or hyperchannel.
5. the demodulating equipment of a kind of optic fiber grating wavelength according to claim 4, it is characterized in that, the output terminal of described scanning light source connects a shunt, these shunt output at least two bundle scan light signals, the passage that every bundle scan light signal forms to a circulator respectively, also include fiber grating, opto-electronic conversion and signal processing module, differential zero passage detection module, comparison module and adjustable reference module in this passage, the shared data processing module of data processing in a plurality of passages.
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| CN2011201438886U CN202067057U (en) | 2011-05-09 | 2011-05-09 | Demodulation device for wavelength of fiber grating |
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| CN2011201438886U CN202067057U (en) | 2011-05-09 | 2011-05-09 | Demodulation device for wavelength of fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376135A (en) * | 2012-04-13 | 2013-10-30 | 中国石油化工股份有限公司 | Non-contact optical fiber device and method for measuring flows |
| CN106338308A (en) * | 2016-08-25 | 2017-01-18 | 武汉理工大学 | Distributed multi-parameter sensing system based on ultra-short fiber Bragg grating array |
-
2011
- 2011-05-09 CN CN2011201438886U patent/CN202067057U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376135A (en) * | 2012-04-13 | 2013-10-30 | 中国石油化工股份有限公司 | Non-contact optical fiber device and method for measuring flows |
| CN106338308A (en) * | 2016-08-25 | 2017-01-18 | 武汉理工大学 | Distributed multi-parameter sensing system based on ultra-short fiber Bragg grating array |
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| CP01 | Change in the name or title of a patent holder |
Address after: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai 201204 Lane 289, building 3, 2 floor Patentee after: Shanghai Zishan Photoelectric Technology Co., Ltd. Patentee after: SHANGHAI BANDWEAVER TECHNOLOGIES CO., LTD. Address before: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai 201204 Lane 289, building 3, 2 floor Patentee before: Shanghai Zishan Photoelectric Technology Co., Ltd. Patentee before: Shanghai Bohui Communication Technology Co., Ltd. |
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Address after: 2nd Floor, Lane 3, 289 Bisheng Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 20104 Co-patentee after: Shanghai Bohui Technology Co., Ltd. Patentee after: Shanghai Zishan Photoelectric Technology Co., Ltd. Address before: 2nd Floor, Lane 3, 289 Bisheng Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 20104 Co-patentee before: Shanghai Bandweaver Technology Co., Ltd. Patentee before: Shanghai Zishan Photoelectric Technology Co., Ltd. |
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Granted publication date: 20111207 Termination date: 20200509 |
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| CF01 | Termination of patent right due to non-payment of annual fee |