CN103344264A - Multichannel optical fiber sensing network demodulating system - Google Patents
Multichannel optical fiber sensing network demodulating system Download PDFInfo
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- CN103344264A CN103344264A CN 201310258276 CN201310258276A CN103344264A CN 103344264 A CN103344264 A CN 103344264A CN 201310258276 CN201310258276 CN 201310258276 CN 201310258276 A CN201310258276 A CN 201310258276A CN 103344264 A CN103344264 A CN 103344264A
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Abstract
A multichannel optical fiber sensing network demodulating system comprises a pump light source. The input end of an optical wavelength division multiplexer is connected with the output end of the pump light source, the input end of an opto-isolator is connected with the first output end of the wavelength division multiplexer, the first input end of a michelson interferometer is connected with the output end of the opto-isolator, the input end of an optical dense wavelength division multiplexer is connected with the output end of the michelson interferometer, the input end of a photoelectric detector array is connected with the output end of the optical dense wavelength division multiplexer, the first input end of a data acquisition card is connected with the output end of a photoelectric detector, the first output end of a carrier circuit is connected with the second input end of the michelson interferometer, the second output end of the carrier circuit is connected with the second input end of the data acquisition card, the input end of a data processing module is connected with the output end of the data acquisition card, and the input end of a fiber laser type sensor array is connected with the second output end of the wavelength division multiplexer. The multichannel optical fiber sensing network demodulating system can solve the technical problem of real-time demodulation of short development cycle and low cost with enlargement of the range of a sensing network of an optical fiber sensing network.
Description
Technical field
The invention belongs to Fibre Optical Sensor and optical signalling process field, a kind of multi-channel high-accuracy network signal demodulating system based on Fibre Optical Sensor of saying so more specifically.
Background technology
With respect to traditional mechanical type and electricity sensing, Fibre Optical Sensor has many excellent properties, as: highly sensitive, dynamic range is big, anti-electromagnetic interference (EMI), anticorrosive, volume is little, in light weight, be easy to multiplexingly etc., this makes that field (as microearthquake monitoring, safety monitoring etc.) such as rugged surroundings and high sensitivity sensing has application prospect widely to this technology in the down-hole etc.Development along with optical fiber sensing technology, the optical fiber sensing system of single-point can not meet the demands far away, multiple spot optical fiber sensing network based on technology such as wavelength-division multiplex, frequency division multiplexing, time division multiplex, space division multiplexing, coherent multiplexings is proposed by people in succession, be accompanied by the development of sensing network, the analysis of network signal also comes into one's own day by day with processing and develops.People have proposed above-mentioned various multiplex techniques are mixed to improve the multiplexing scale of optical fiber sensing network in recent years.Under above-mentioned background, the multi-point sensing network and the demodulating system thereof that are applied to sensory field of optic fibre have caused extensive concern.In this type systematic, the picking up and problem such as identify and must be resolved of the power equalization of each sensor and phase equalization and network signal.At this moment, demodulating system must make noise level, dynamic range, stability, repeatability, correlativity, the consistance of system, performance such as crosstalk be optimized as far as possible in the improvement of the optimal design of finishing under the prerequisite of collecting signal as far as possible optimal design by system hardware, software key parameter and demodulating algorithm, meets and exceeds the requirement of present sensory field of optic fibre.Further, universal optical fiber sensing network demodulation system also should be implemented, and to improve the compatibility of system, reduces and arranges net and maintenance cost.By the end of at present, prior art can not well satisfy above-mentioned requirements.
In sum, in order to solve the above-mentioned technical bottleneck that faces, build high-performance, high stability, optical fiber sensing network demodulating system real-time, that compatibility is high, press for a kind of multi-channel high-accuracy optical fiber sensing network demodulating system at present.
Summary of the invention
The objective of the invention is to, a kind of multichannel optical fiber sensing network demodulation system is provided, it can solve the existing fiber sensing network along with the expansion of sensing network scale, low construction cycle, the technical matters of the real-time demodulation of high-performance high stable cheaply.
The invention provides a kind of multichannel optical fiber sensing network demodulation system, comprising:
Pump light source;
Light wavelength division multiplexing, its input end is connected with the output terminal of pump light source;
Optoisolator, its input end is connected with first output terminal of wavelength division multiplexer;
Michelson interferometer, its first input end is connected with the output terminal of optoisolator;
The light dense wave division multiplexer, its input end is connected with the output terminal of Michelson interferometer;
Photodetector array, its input end is connected with the output terminal of light dense wave division multiplexer;
Data collecting card, its first input end is connected with the output terminal of photodetector;
Carrier current channel, its first output terminal is connected with second input end of Michelson interferometer, and second output terminal is connected with second input end of data collecting card;
Data processing module, its input end is connected with the output terminal of data collecting card;
Optical-fiber laser type sensor array, its input end is connected with second output terminal of wavelength division multiplexer.
From technique scheme as can be seen, the present invention has following beneficial effect:
This multi-channel high-accuracy optical fiber sensing network demodulating system is simple in structure, low in energy consumption, build and maintenance cost low, the construction cycle is short, but the wavelength shift resolution height of demodulation can be finished the real-time demodulation of multi-channel synchronous.
Description of drawings
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is structural representation of the present invention;
Fig. 2 is Fig. 1 one embodiment, shows the structural representation with multichannel optical fiber sensing network demodulation system.
Embodiment
See also shown in Figure 1ly, the invention provides a kind of multichannel optical fiber sensing network demodulation system, comprising:
Pump light source a, being used for swashing type sensor array j to optical fiber provides pump light, and excitation fiber laser class sensor produces laser output, and the quantity of described pump light source a is more than or equal to 1;
Light wavelength division multiplexing b, its input end is connected with the output terminal of pump light source a, be used for the output light of pump light source a is transferred to optical-fiber laser type sensor array j, receive simultaneously from the laser of optical-fiber laser type sensor array j output, the quantity of described light wavelength division multiplexing b is more than or equal to 1, and its multiplexing centre wavelength is consistent with the wavelength coverage of pump light source a and optical-fiber laser type sensor array j;
Optoisolator c, its input end is connected with first output terminal of wavelength division multiplexer b, is used for reducing the optical fiber rear orientation light to the influence of system works, and the quantity of described optoisolator c is more than or equal to 1:
Michelson interferometer d, its first input end is connected with the output terminal of optoisolator c, be used for the wavelength shift signal of optical-fiber laser type sensor array j is converted to phase signal, produce interference fringe output simultaneously, described Michelson interferometer d is the Mach-Zehnder interferometer of band Polarization Control;
Light dense wave division multiplexer e, its input end is connected with the output terminal of Michelson interferometer d, be used for the light signal of each optical-fiber laser type sensor output of optical-fiber laser type fibre optic sensor arra j separately, and pass to each photodetector among the photodetector array f respectively;
Photodetector array f, its input end is connected with the output terminal of light dense wave division multiplexer e, is used for the light signal that receives is converted to analog electrical signal;
Data collecting card g, its first input end is connected with the output terminal of photodetector f, is used for the analog electrical signal that receives is converted to digital electric signal;
Carrier current channel h, its first output terminal is connected with second input end of Michelson interferometer d, second output terminal is connected with second input end of data collecting card g, be used for the PZT load-modulate signal to Michelson interferometer inside, and providing carrier signal to data collecting card g so that data processing module i carries out data to be handled, described carrier current channel h is signal generator;
Data processing module i, its input end is connected with the output terminal of data collecting card g, the analysis, the processing that are used for receiving the digital electric signal of data collecting card g output and finish signal, described data handling system i is DSP module, FPGA module or PC module;
Optical-fiber laser type sensor array j, its input end is connected with second output terminal of wavelength division multiplexer b, and the centre wavelength of described optical-fiber laser type sensor array j is positioned within the channel range of light dense wave division multiplexer e.
See also shown in Figure 2ly, show the structural representation with multichannel optical fiber sensing network demodulation system, wherein
Four of described pump light source a;
Four of described light wavelength division multiplexing b, the input end of its each light wavelength division multiplexing are connected with the output terminal of a pump light source a respectively;
Four of described optoisolator c, its each input end are connected with first output terminal of a light wavelength division multiplexing b respectively;
Described Michelson interferometer d, its each first input end are connected with the output terminal of an optoisolator c respectively;
Four of described smooth dense wave division multiplexer e, its each input end are connected with the output terminal of Michelson interferometer d respectively;
Described photodetector array f, its input end are connected with the output terminal of light dense wave division multiplexer e respectively;
Described data collecting card g, its first input end is connected with the output terminal of photodetector f;
Described carrier current channel h, its first output terminal is connected with second input end of Michelson interferometer d, and second output terminal is connected with second input end of data collecting card g;
Described data processing module i, its input end is connected with the output terminal of data collecting card g;
Described optical-fiber laser type sensor array j, its input end is connected with second output terminal of wavelength division multiplexer b.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; be understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. multichannel optical fiber sensing network demodulation system comprises:
Pump light source;
Light wavelength division multiplexing, its input end is connected with the output terminal of pump light source;
Optoisolator, its input end is connected with first output terminal of wavelength division multiplexer;
Michelson interferometer, its first input end is connected with the output terminal of optoisolator;
The light dense wave division multiplexer, its input end is connected with the output terminal of Michelson interferometer;
Photodetector array, its input end is connected with the output terminal of light dense wave division multiplexer;
Data collecting card, its first input end is connected with the output terminal of photodetector;
Carrier current channel, its first output terminal is connected with second input end of Michelson interferometer, and second output terminal is connected with second input end of data collecting card;
Data processing module, its input end is connected with the output terminal of data collecting card;
Optical-fiber laser type sensor array, its input end is connected with second output terminal of wavelength division multiplexer.
2. multichannel optical fiber sensing network demodulation according to claim 1 system, wherein the quantity of pump light source, light wavelength division multiplexing, optoisolator and light dense wave division multiplexer is more than or equal to 1.
3. multichannel optical fiber sensing network demodulation according to claim 1 system, wherein the wavelength of each passage of light wavelength division multiplexing is consistent with the wavelength scope of living in of optical-fiber laser type sensor.
4. multichannel optical fiber sensing network demodulation according to claim 1 system, wherein carrier current channel is signal generator.
5. multichannel optical fiber sensing network demodulation according to claim 1 system, wherein the centre wavelength of optical-fiber laser type sensor is positioned within the wavelength coverage of each passage of light dense wave division multiplexer.
6. multichannel optical fiber sensing network demodulation according to claim 1 system, data processing module wherein is DSP module, FPGA module or PC module.
7. multichannel optical fiber sensing network demodulation according to claim 1 system, wherein Michelson interferometer is the Mach-Zehnder interferometer of band Polarization Control.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759750A (en) * | 2014-01-23 | 2014-04-30 | 中国科学院半导体研究所 | Distributed optical fiber sensing system based on phase generated carrier technology |
| CN104457960A (en) * | 2014-12-11 | 2015-03-25 | 中国科学院半导体研究所 | Distributed optical fiber sensing system based on coherent reception technology |
| CN108489594A (en) * | 2018-03-14 | 2018-09-04 | 中国科学院半导体研究所 | Hybrid optical fiber sensor system based on phase generated carrier technology |
| CN108731708A (en) * | 2018-04-24 | 2018-11-02 | 天津大学 | The matched multichannel low coherence interference demodulation method in the arbitrary channel of sensor can be achieved |
| CN109167633A (en) * | 2018-08-14 | 2019-01-08 | 中国电子科技集团公司第三十八研究所 | Optical-fiber laser sensing network multi-channel parallel demodulating system based on FPGA |
| CN115047566A (en) * | 2022-06-28 | 2022-09-13 | 东北大学 | Method for preparing space division multiplexing/demultiplexing device for multi-core optical fiber |
| CN118088954A (en) * | 2024-04-23 | 2024-05-28 | 齐鲁工业大学(山东省科学院) | Oil gas pipeline leakage wave identification and monitoring system |
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2013
- 2013-06-26 CN CN 201310258276 patent/CN103344264A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759750A (en) * | 2014-01-23 | 2014-04-30 | 中国科学院半导体研究所 | Distributed optical fiber sensing system based on phase generated carrier technology |
| CN103759750B (en) * | 2014-01-23 | 2016-05-25 | 中国科学院半导体研究所 | Based on the distributed optical fiber sensing system of phase generated carrier technology |
| CN104457960A (en) * | 2014-12-11 | 2015-03-25 | 中国科学院半导体研究所 | Distributed optical fiber sensing system based on coherent reception technology |
| CN104457960B (en) * | 2014-12-11 | 2017-05-24 | 中国科学院半导体研究所 | Distributed optical fiber sensing system based on coherent reception technology |
| CN108489594A (en) * | 2018-03-14 | 2018-09-04 | 中国科学院半导体研究所 | Hybrid optical fiber sensor system based on phase generated carrier technology |
| CN108489594B (en) * | 2018-03-14 | 2020-02-18 | 中国科学院半导体研究所 | Hybrid optical fiber sensing system based on phase generation carrier technology |
| CN108731708A (en) * | 2018-04-24 | 2018-11-02 | 天津大学 | The matched multichannel low coherence interference demodulation method in the arbitrary channel of sensor can be achieved |
| CN108731708B (en) * | 2018-04-24 | 2020-04-24 | 天津大学 | Multi-channel low-coherence interference demodulation method capable of realizing arbitrary channel matching of sensor |
| CN109167633A (en) * | 2018-08-14 | 2019-01-08 | 中国电子科技集团公司第三十八研究所 | Optical-fiber laser sensing network multi-channel parallel demodulating system based on FPGA |
| CN115047566A (en) * | 2022-06-28 | 2022-09-13 | 东北大学 | Method for preparing space division multiplexing/demultiplexing device for multi-core optical fiber |
| CN118088954A (en) * | 2024-04-23 | 2024-05-28 | 齐鲁工业大学(山东省科学院) | Oil gas pipeline leakage wave identification and monitoring system |
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