CN202974309U - Wavelength demodulation unit of fiber bragg grating sensor - Google Patents
Wavelength demodulation unit of fiber bragg grating sensor Download PDFInfo
- Publication number
- CN202974309U CN202974309U CN 201220574275 CN201220574275U CN202974309U CN 202974309 U CN202974309 U CN 202974309U CN 201220574275 CN201220574275 CN 201220574275 CN 201220574275 U CN201220574275 U CN 201220574275U CN 202974309 U CN202974309 U CN 202974309U
- Authority
- CN
- China
- Prior art keywords
- output
- connects
- converter
- coupling mechanism
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a wavelength demodulation unit of a fiber bragg grating sensor. A light emit by a light source enters a fiber bragg grating unit through a first coupler. A reflection light of the fiber bragg grating unit enters an F-P filter through the first coupler. The scanning output of the F-P filter is connected with an interferometer which is composed of a 2x2 second coupler and a 3x3 third coupler. Three light signals output by the interferometer undergo PD detection and become three electrical signals. The output of three electrical signals is connected with an adder and adding is carried out. The output of the adder is connected with a comparator to be compared with a reference voltage. The output of the comparator and the three electrical signals are input into a peak holding unit. The peak holding unit carries out peak holding on the three electrical signals and then carries out inputting to an AD converter. The AD converter is connected with the output of the adder at the same time. The output of the AD converter is connected with a CPU. A control signal output by the CPU is connected with a signal generator. The signal generator is connected with an F-P filter controller to scan frequency. According to the utility model, basic components are selected, and high sensitivity and resolution are realized.
Description
Technical field
The utility model relates to fiber-optic grating sensor field, particularly a kind of Wavelength demodulation unit of fiber-optic grating sensor.
Background technology
Fiber-optic grating sensor because its high stability, high sensitivity and high reliability have obtained using more and more widely, is its focus technology in the demodulation of fiber-optic grating sensor medium wavelength.Generally carry out demodulation with the method for length scanning or coupling grating in prior art, the resolution of these methods is difficult to satisfy the requirement of accurate industry.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of Wavelength demodulation unit of fiber-optic grating sensor, has characteristics easy to use simple in structure.
To achieve these goals, the technical solution adopted in the utility model is:
a kind of Wavelength demodulation unit of fiber-optic grating sensor, source emissioning light enters into the fiber grating unit through coupling mechanism one, the reflected light of fiber grating unit enters the F-P wave filter through coupling mechanism one, the scanning of F-P wave filter output connects the interferometer that the coupling mechanism three of the coupling mechanism two of 2x2 and 3x3 consists of, three road light signals of interferometer output become three road electric signal after PD detects, the output of three road electric signal connects totalizer and carries out addition, the output of totalizer connects comparer and reference voltage compares, the output of comparer inputs to the peak value holding unit together with described three road electric signal, the peak value holding unit carries out inputing to AD converter after peak value keeps to this three road electric signal, AD converter connects the output of described totalizer simultaneously, the output of AD converter meets CPU, CPU output control signal connects signal generator, signal generator connects F-P filter controller sweep frequency.
Compared with prior art, the utility model is selected basic components and parts, has reached higher sensitivity and resolution.
Description of drawings
Accompanying drawing is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is carried out more detailed explanation.
as shown in the figure, the utility model is a kind of Wavelength demodulation unit of fiber-optic grating sensor, source emissioning light enters into the fiber grating unit through coupling mechanism one, the reflected light of fiber grating unit enters the F-P wave filter through coupling mechanism one, the scanning of F-P wave filter output connects the interferometer that the coupling mechanism three of the coupling mechanism two of 2x2 and 3x3 consists of, three road light signals of interferometer output become three road electric signal after PD detects, the output of three road electric signal connects totalizer and carries out addition, the output of totalizer connects comparer and reference voltage compares, when the output signal of totalizer during greater than reference voltage, the comparer upset.In next cycle, during less than reference voltage, comparer turns back when the output signal of totalizer.The output of comparer inputs to the peak value holding unit together with described three road electric signal, the peak value holding unit carries out inputing to AD converter after peak value keeps to this three road electric signal, AD converter connects the output of described totalizer simultaneously, the output of AD converter meets CPU, CPU output control signal connects signal generator, and signal generator connects F-P filter controller sweep frequency.Comparer upset with turn back during, peak voltage signal corresponding to the centre wavelength of fiber grating detected by peak detection circuit and keeps, and does further processing by CPU element.
Claims (1)
1. the Wavelength demodulation unit of a fiber-optic grating sensor, source emissioning light enters into the fiber grating unit through coupling mechanism one, it is characterized in that, the reflected light of fiber grating unit enters the F-P wave filter through coupling mechanism one, the scanning of F-P wave filter output connects the interferometer that the coupling mechanism three of the coupling mechanism two of 2x2 and 3x3 consists of, three road light signals of interferometer output become three road electric signal after PD detects, the output of three road electric signal connects totalizer and carries out addition, the output of totalizer connects comparer and reference voltage compares, the output of comparer inputs to the peak value holding unit together with described three road electric signal, the peak value holding unit carries out inputing to AD converter after peak value keeps to this three road electric signal, AD converter connects the output of described totalizer simultaneously, the output of AD converter meets CPU, CPU output control signal connects signal generator, signal generator connects F-P filter controller sweep frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220574275 CN202974309U (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation unit of fiber bragg grating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220574275 CN202974309U (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation unit of fiber bragg grating sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202974309U true CN202974309U (en) | 2013-06-05 |
Family
ID=48515369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220574275 Expired - Fee Related CN202974309U (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation unit of fiber bragg grating sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202974309U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238553A (en) * | 2020-03-17 | 2020-06-05 | 南京航空航天大学 | Wavelength demodulation method and device for fiber grating sensor |
-
2012
- 2012-11-02 CN CN 201220574275 patent/CN202974309U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238553A (en) * | 2020-03-17 | 2020-06-05 | 南京航空航天大学 | Wavelength demodulation method and device for fiber grating sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104019836B (en) | Based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument and the method utilizing this analyser suppression common-mode noise | |
| CN104198789B (en) | A kind of optical fiber current mutual inductor based on magnetostrictive effect | |
| JP2012130237A5 (en) | Power supply device | |
| CN105277270B (en) | A kind of double mode vibration-detection system based on optical fiber grating sensing | |
| CN102853936B (en) | Remote distributed optical fiber Raman temperature sensor | |
| CN204359896U (en) | For the Fiber Bragg Grating ultrasonic wave detecting system that electrical network local discharge of electrical equipment detects | |
| CN202974309U (en) | Wavelength demodulation unit of fiber bragg grating sensor | |
| CN201859177U (en) | Measurement module for low-frequency alternating current signal in relay protection device | |
| CN103791934A (en) | Wavelength demodulation structure used for fiber-bragg-grating sensor | |
| CN101718580B (en) | Sound vibration acquisition device based on optical grating | |
| CN110635841B (en) | Method and device for improving echo signal of chaotic optical time domain reflectometer | |
| CN202770555U (en) | Remote distributed optical fiber Raman temperature sensor and annular area temperature measuring device | |
| CN104154935A (en) | Method for improving sensitivity of FBG demodulation system based on sideband filtering | |
| CN102944255B (en) | Digital optical fiber grating demodulation instrument and method | |
| CN103400092A (en) | Surface acoustic wave reader receiving link structure based on amplitude code and working method thereof | |
| CN102692268B (en) | Distributed optical fiber vibration sensor for structural vibration detection | |
| CN206989976U (en) | A kind of demodulating system based on tunable distributed feedback laser diode | |
| CN203616338U (en) | Phase sensitive modulation-type photoelectric speed sensor | |
| CN202255625U (en) | Spectrometer based on fiber grating time domain reflection technology | |
| CN205123743U (en) | But barrier appearance is sought to optic fibre of wireless transmission data | |
| CN204886972U (en) | Take radio frequency to detect optical fiber amplifier of function | |
| CN204177847U (en) | A kind of fiber optic circuit control circuit | |
| CN117031101B (en) | Broadband optical fiber current sensor, measuring method, measuring system, medium and device | |
| CN203615999U (en) | Optical fiber vibration sensor and vibration sensing system based on fluorescence method | |
| CN201819673U (en) | Optical edge finder of projection instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHAANXI JOIN CREATE SCIENCE AND TECHNOLOGY CO., LTD. Assignor: Xi'an Jiaotong University Jingsheng Science & Technology Development Co., Ltd. Contract record no.: 2014610000078 Denomination of utility model: Wavelength demodulation unit of fiber bragg grating sensor Granted publication date: 20130605 License type: Exclusive License Record date: 20140423 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20151102 |
|
| EXPY | Termination of patent right or utility model |