CN103791934A - Wavelength demodulation structure used for fiber-bragg-grating sensor - Google Patents
Wavelength demodulation structure used for fiber-bragg-grating sensor Download PDFInfo
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- CN103791934A CN103791934A CN201210434083.6A CN201210434083A CN103791934A CN 103791934 A CN103791934 A CN 103791934A CN 201210434083 A CN201210434083 A CN 201210434083A CN 103791934 A CN103791934 A CN 103791934A
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Abstract
Disclosed is a wavelength demodulation structure used for a fiber-bragg-grating sensor. Emitted light of a light source enters a fiber-bragg-grating unit through a coupler I and then reflected light of the fiber-bragg-grating unit enters an F-P filter through the coupler I. Scanning output of the F-P filter is connected with an interferometer which includes a 2*2 coupler II and a 3*3 coupler III. Three paths of light signals output by the interferometer are converted into three paths of electrical signals after PD detection and output of the three paths of electrical signals is connected with a summator for addition. Output of the summator is connected with a comparator for comparison with a reference voltage. Output of the comparator, together with the three paths of electrical signals, is input into a peak value maintaining unit. The peak value maintaining unit performs peak value maintaining on the three paths of electrical signals which are then input to an AD converter. The AD converter is connected with output of the summator at the same time. Output of the AD converter is connected with a CPU. Control signals output by the CPU are connected with a signal generator. The signal generator is connected with the controller scanning frequency of the F-P filter. The wavelength demodulation structure used for the fiber-bragg-grating sensor selects basic components and parts and achieves comparatively high sensitivity and distinguishability.
Description
Technical field
The present invention relates to fiber-optic grating sensor field, particularly a kind of Wavelength demodulation structure for fiber-optic grating sensor.
Background technology
Fiber-optic grating sensor, because its high stability, high sensitivity and high reliability have obtained application more and more widely, is its focus technology in the demodulation of fiber-optic grating sensor medium wavelength.In prior art, generally carry out demodulation by the method for length scanning or coupling grating, the resolution of these methods is difficult to meet the requirement of accurate industry.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of Wavelength demodulation structure for fiber-optic grating sensor, there is feature easy to use simple in structure.
To achieve these goals, the technical solution used in the present invention is:
A kind of Wavelength demodulation structure for fiber-optic grating sensor, source emissioning light enters into fiber grating unit through coupling mechanism one, the reflected light of fiber grating unit enters F-P wave filter through coupling mechanism one, the scanning output of F-P wave filter connects the interferometer that the coupling mechanism two of 2x2 and the coupling mechanism three of 3x3 form, interferometer output San road light signal becomes three road electric signal after PD detects, the output of three road electric signal connects totalizer and is added, the output of totalizer connects comparer and reference voltage compares, the output of comparer inputs to peak value holding unit together with described three road electric signal, peak value holding unit Dui Gai tri-road electric signal carry out inputing to AD converter after peak value maintenance, 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 present invention selects basic components and parts, has reached higher sensitivity and resolution.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is carried out to more detailed explanation.
As shown in the figure, the present invention is a kind of Wavelength demodulation structure for fiber-optic grating sensor, source emissioning light enters into fiber grating unit through coupling mechanism one, the reflected light of fiber grating unit enters F-P wave filter through coupling mechanism one, the scanning output of F-P wave filter connects the interferometer that the coupling mechanism two of 2x2 and the coupling mechanism three of 3x3 form, interferometer output San road light signal becomes three road electric signal after PD detects, the output of three road electric signal connects totalizer and is added, the output of totalizer connects comparer and reference voltage compares, in the time that the output signal of totalizer is greater than reference voltage, comparer upset.In next cycle, in the time that the output signal of totalizer is less than reference voltage, comparer turns back.The output of comparer inputs to peak value holding unit together with described three road electric signal, peak value holding unit Dui Gai tri-road electric signal carry out inputing to AD converter after peak value maintenance, 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.During comparer upset and turning back, the peak voltage signal corresponding to 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 structure for fiber-optic grating sensor, source emissioning light enters into fiber grating unit through coupling mechanism one, it is characterized in that, the reflected light of fiber grating unit enters F-P wave filter through coupling mechanism one, the scanning output of F-P wave filter connects the interferometer that the coupling mechanism two of 2x2 and the coupling mechanism three of 3x3 form, interferometer output San road light signal becomes three road electric signal after PD detects, the output of three road electric signal connects totalizer and is added, the output of totalizer connects comparer and reference voltage compares, the output of comparer inputs to peak value holding unit together with described three road electric signal, peak value holding unit Dui Gai tri-road electric signal carry out inputing to AD converter after peak value maintenance, 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 |
|---|---|---|---|
| CN201210434083.6A CN103791934A (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation structure used for fiber-bragg-grating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210434083.6A CN103791934A (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation structure used for fiber-bragg-grating sensor |
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| CN103791934A true CN103791934A (en) | 2014-05-14 |
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| CN201210434083.6A Pending CN103791934A (en) | 2012-11-02 | 2012-11-02 | Wavelength demodulation structure used for fiber-bragg-grating sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482862A (en) * | 2016-09-29 | 2017-03-08 | 西安交通大学 | A kind of demodulation method of optical fiber F P temperature sensor and system |
| 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 |
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2012
- 2012-11-02 CN CN201210434083.6A patent/CN103791934A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482862A (en) * | 2016-09-29 | 2017-03-08 | 西安交通大学 | A kind of demodulation method of optical fiber F P temperature sensor and system |
| 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 |
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Application publication date: 20140514 |