CN102435213A - Optical fiber grating wavelength demodulation device based on Fresnel holographic wavelength division multiplexer - Google Patents
Optical fiber grating wavelength demodulation device based on Fresnel holographic wavelength division multiplexer Download PDFInfo
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- CN102435213A CN102435213A CN2011102609260A CN201110260926A CN102435213A CN 102435213 A CN102435213 A CN 102435213A CN 2011102609260 A CN2011102609260 A CN 2011102609260A CN 201110260926 A CN201110260926 A CN 201110260926A CN 102435213 A CN102435213 A CN 102435213A
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Abstract
An optical fiber grating wavelength demodulation device based on a Fresnel holographic wavelength division multiplexer, which relates to an optical fiber grating wavelength demodulation device, is provided with a circulator, the Fresnel holographic wavelength division multiplexer, photoelectric detectors, a data acquisition card and a computer. The circulator is provided with a light source light input port, a light source light output port and an optical fiber grating reflected light output port, wherein the light source light input port is externally connected with a light source, and the light source light output port is externally connected with an optical fiber grating group. The input end of the Fresnel holographic wavelength division multiplexer is connected with the optical fiber grating reflected light output port of the circulator, the Fresnel holographic wavelength division multiplexer is provided with a plurality of channels, and each channel is provided with a photoelectric detector. The output end of each photoelectric detector is connected with an input end of the data acquisition card, and the output end of the data acquisition card is connected with the computer. The optical fiber grating wavelength demodulation device has the advantages of low cost and high practicability, can simultaneously carry out wavelength demodulation on a plurality of optical fiber gratings, and can also be used for the joint measurement of dynamic and static parameters.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of optic fiber grating wavelength demodulating equipment, especially relate to a kind of optic fiber grating wavelength demodulating equipment based on Fresnel holographic wavelength division multiplexer.
Background technology
Highly sensitive, anti-electromagnetic interference (EMI) that fiber-optic grating sensor has, based on Wavelength-encoding work, can realize advantages such as multiple spot distributed measurement, thereby become the research focus of sensory field.The optic fiber grating wavelength demodulation is the gordian technique that realizes optical fiber grating sensing, and existing multiple demodulation method is proposed in succession, and they respectively have relative merits.By contrast, and the boundary filter method (referring to S.M.Melle, K.Liu; And R.M.Measures, IEEE Photonics Technology Letters, 1992; 4 (5): 516-518) not only cost is lower, use is more convenient, stability is better; And it is fast to have response speed, is applicable to the advantage that static parameter is measured and dynamic parameter is measured simultaneously, but this method only is fit to the Wavelength demodulation of single fiber grating.Array waveguide grating (AWG) demodulation method (referring to JP 2000-180270, SANO YASUKAZU) as wave filter, has overcome the above-mentioned shortcoming of boundary filter method with the AWG wavelength division multiplexer, can carry out Wavelength demodulation to a plurality of fiber gratings simultaneously.Yet the semiconductor technology of standard is adopted in the making of AWG, and cost is higher relatively, and possibly have passage transmission spectrum and the unmatched problem of fiber grating reflectance spectrum wavelength coverage.Therefore, seek the new wave filter that is used for the optic fiber grating wavelength demodulation and have important use value.
Fresnel holographic wavelength division multiplexer (referring to Chinese patent CN 1256821C) is a kind of novel wavelength division multiplexer that has from axle Fresnel lens arrangement that proposes in recent years.This wavelength division multiplexer adopts laser holography to be made, and be fit to through reproduction technology produce in enormous quantities (referring to X.Ren, S.Liu; X.Zhang; And S.Li, Proceedings of SPIE, 2008; 6832:68322M-1-68322M-8), therefore have the characteristics that cost is low, throughput rate is high.In addition; Because this wavelength division multiplexer belongs to the angular dispersion device; It can make multiplexing multiple wavelength optical signal in an optical fiber separate in the space by wavelength; Each wavelength is corresponding to the unique angle of diffraction in space, and the position that therefore changes output terminal reception optical fiber can change the wavelength coverage of passage transmission spectrum.These characteristics shows, can realize at low cost simultaneously a plurality of fiber gratings being carried out Wavelength demodulation as wave filter with Fresnel holographic wavelength division multiplexer; And can solve the unmatched problem of wavelength coverage that the AWG demodulation method possibly exist easily, applicability is stronger.But the technology that adopts Fresnel holographic wavelength division multiplexer to carry out the optic fiber grating wavelength demodulation is not at present appeared in the newspapers as yet.
Summary of the invention
The purpose of this invention is to provide that a kind of cost is lower, applicability is strong; Can carry out Wavelength demodulation to a plurality of fiber gratings simultaneously, and can be used for dynamically combining the optic fiber grating wavelength demodulating equipment based on Fresnel holographic wavelength division multiplexer of measurement with static parameter.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The present invention is provided with circulator, Fresnel holographic wavelength division multiplexer, photodetector, data collecting card and computing machine; Circulator is provided with light source light input port, light source light output port and fiber grating reflected light output port, light source light input port external light source, the external fiber grating group of light source light output port; The input end of Fresnel holographic wavelength division multiplexer is connected with the fiber grating reflected light output port of circulator; Fresnel holographic wavelength division multiplexer is provided with a plurality of passages; Each passage only carries out filtering to the reflected light of a fiber grating; Each passage is all established photodetector, and each photodetector output terminal all connects the data collecting card input end, data collecting card output termination computing machine.
Principle of work of the present invention and beneficial effect are following:
Through adopting the combination of Fresnel holographic wavelength division multiplexer, photodetector, data collecting card and computing machine; Can realize simultaneously a plurality of fiber gratings being carried out Wavelength demodulation: Fresnel holographic wavelength division multiplexer is used to receive the reflected light of fiber grating; Play the effect of multi-channel filter; The approximate Gaussian that meets of the transmission spectrum of passage; The reflected light of each fiber grating carries out filtering through two adjacent passages, and the pairing wavelength coverage of the lap of adjacency channel transmission spectrum promptly is the effective range of Wavelength demodulation, and each passage reflected light to a fiber grating carries out filtering and can avoid crosstalking; Photodetector is used to measure the Output optical power of passage, and its number is identical with the number of passage; Data collecting card is used to gather the output electric signal of each photodetector; Computing machine is used for the output quantity of adjacent photodetectors is made division arithmetic and the result is taken the logarithm, and shows the wavelength demodulation result according to the linear relationship that peak wavelength became of operation result and fiber grating reflectance spectrum.Division arithmetic has been eliminated the influence of light source power unevenness and fluctuation, the peak wavelength linear (referring to Chinese patent CN 2745045Y) of taking the logarithm and making operation result and fiber grating reflectance spectrum.
The present invention has following outstanding advantage:
1, cost is lower.The wave filter that the present invention adopted is that Fresnel holographic wavelength division multiplexer adopts laser holography to be made; And be fit to produce in enormous quantities through reproduction technology; Have the advantages that cost is low, throughput rate is high, thereby adopt optic fiber grating wavelength demodulating equipment cost of the present invention lower.
2, applicability is stronger.The wave filter that the present invention adopted is that Fresnel holographic wavelength division multiplexer belongs to the angular dispersion device; The position that changes output terminal reception optical fiber can change the wavelength coverage of passage transmission spectrum; Can solve the passage transmission spectrum and the unmatched problem of fiber grating reflectance spectrum wavelength coverage that adopt array waveguide grating (AWG) demodulating equipment to exist easily, thereby applicability of the present invention is strengthened significantly.
Description of drawings
Fig. 1 forms and application synoptic diagram (simultaneously a plurality of fiber gratings being carried out the system schematic of Wavelength demodulation) for the structure of the embodiment of the invention.Among Fig. 1: 1 is wideband light source, and 2 is circulator, and 3 are fiber grating group (the fiber grating group is that a plurality of fiber gratings are cascaded); 4 is Fresnel holographic wavelength division multiplexer, and 5 is the passage of Fresnel holographic wavelength division multiplexer, and 6 is photodetector; 7 is data collecting card, and 8 is computing machine.
Embodiment
As shown in Figure 1, the light that wideband light source 1 sends gets into a plurality of fiber gratings 3 that are cascaded through circulator 2 from port B output from the port A input of circulator 2.The variation of fiber grating 3 perception position measured physical quantity, and be converted into the variation of reflectance spectrum peak wavelength, the approximate Gaussian that meets of said reflectance spectrum.The reflected light of fiber grating 3 from port C output, has got into the Fresnel holographic wavelength division multiplexer 4 of multi-channel filter effect through circulator 2.The approximate Gaussian that meets of the transmission spectrum of the passage 5 of Fresnel holographic wavelength division multiplexer 4; The reflected light of each fiber grating 3 carries out filtering through adjacent two passages 5; The pairing wavelength coverage of the lap of adjacent two passage transmission spectrums promptly is the effective range of Wavelength demodulation, and each passage only carries out filtering to the reflected light of a fiber grating 3 and crosstalks avoiding.Photodetector 6 is connected with the passage 5 of Fresnel holographic wavelength division multiplexer 4, is used to measure the Output optical power of passage 5, and the number of photodetector 6 is identical with the number of passage 5.Data collecting card 7 is connected with the electrical signal of photodetector 6, is used to gather the output electric signal of each photodetector 6.Computing machine 8 is connected with the output terminal of data collecting card 7; Be used for the output quantity of adjacent photodetectors 6 is made division arithmetic and the result is taken the logarithm; And the result who demonstrates Wavelength demodulation according to the operation result and the linear relationship that peak wavelength became of fiber grating reflectance spectrum; Division arithmetic has been eliminated the influence of light source power unevenness and fluctuation, and taking the logarithm makes the peak wavelength of operation result and fiber grating reflectance spectrum linear.
Claims (1)
1. based on the optic fiber grating wavelength demodulating equipment of Fresnel holographic wavelength division multiplexer, it is characterized in that being provided with circulator, Fresnel holographic wavelength division multiplexer, photodetector, data collecting card and computing machine; Circulator is provided with light source light input port, light source light output port and fiber grating reflected light output port, light source light input port external light source, the external fiber grating group of light source light output port; The input end of Fresnel holographic wavelength division multiplexer is connected with the fiber grating reflected light output port of circulator; Fresnel holographic wavelength division multiplexer is provided with a plurality of passages; Each passage only carries out filtering to the reflected light of a fiber grating, and each passage is all established photodetector; Each photodetector output terminal all connects the data collecting card input end, data collecting card output termination computing machine.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104764471A (en) * | 2014-01-02 | 2015-07-08 | 国网江西省电力公司信息通信分公司 | Wavelength demodulation method and system |
| CN104897335A (en) * | 2015-06-17 | 2015-09-09 | 承德石油高等专科学校 | Fiber bragg grating pressure sensor for achieving wavelength demodulation based on array wavelength division multiplexer technology |
| CN109520429A (en) * | 2018-11-26 | 2019-03-26 | 重庆大学 | The few spectrum sample point high-speed measuring system and method for white light interference type optical fiber Fabry-Perot sensor |
| CN109540293A (en) * | 2018-12-21 | 2019-03-29 | 闽南师范大学 | A kind of spectrum detection device based on fiber grating |
| CN113916271A (en) * | 2021-10-11 | 2022-01-11 | 欧梯恩智能科技(苏州)有限公司 | Optical sensor addressing chip, optical sensor addressing module, optical sensor measuring system and optical sensor measuring method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764471A (en) * | 2014-01-02 | 2015-07-08 | 国网江西省电力公司信息通信分公司 | Wavelength demodulation method and system |
| CN104764471B (en) * | 2014-01-02 | 2017-05-31 | 国网江西省电力公司信息通信分公司 | A kind of Wavelength demodulation method and system |
| CN104897335A (en) * | 2015-06-17 | 2015-09-09 | 承德石油高等专科学校 | Fiber bragg grating pressure sensor for achieving wavelength demodulation based on array wavelength division multiplexer technology |
| CN109520429A (en) * | 2018-11-26 | 2019-03-26 | 重庆大学 | The few spectrum sample point high-speed measuring system and method for white light interference type optical fiber Fabry-Perot sensor |
| CN109540293A (en) * | 2018-12-21 | 2019-03-29 | 闽南师范大学 | A kind of spectrum detection device based on fiber grating |
| CN113916271A (en) * | 2021-10-11 | 2022-01-11 | 欧梯恩智能科技(苏州)有限公司 | Optical sensor addressing chip, optical sensor addressing module, optical sensor measuring system and optical sensor measuring method |
| CN113916271B (en) * | 2021-10-11 | 2023-10-31 | 欧梯恩智能科技(苏州)有限公司 | Optical sensor addressing chip, module, measuring system and measuring method |
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Application publication date: 20120502 |