CN203231820U - Multi-point distributed fiber-grating sensing demodulation system - Google Patents
Multi-point distributed fiber-grating sensing demodulation system Download PDFInfo
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- CN203231820U CN203231820U CN 201320260101 CN201320260101U CN203231820U CN 203231820 U CN203231820 U CN 203231820U CN 201320260101 CN201320260101 CN 201320260101 CN 201320260101 U CN201320260101 U CN 201320260101U CN 203231820 U CN203231820 U CN 203231820U
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Abstract
The utility model discloses a multi-point distributed fiber-grating sensing demodulation system, and the system comprises a pulse broadband optical amplifier, a coupler, a circulator, a fiber-grating array, a pulse generation and control unit, an isolators, an edge filter, an photoelectric detector, a data collection card, a signal analysis and processing part, and a computer display. The fiber-grating array is formed by the series connection of more than two fiber gratings The output terminal of the pulse broadband optical amplifier is connected with an input terminal of the coupler which has two output terminals. A first output terminal of the coupler is connected with a first port of the circulator, and a second port of the circulator is connected with the fiber grating array, and a third port of the circulator is connected with an input terminal of the pulse broadband optical amplifier. Compared with the prior art, the system is capable of monitoring the wavelength changes of tens to hundreds of fiber gratings in a channel at the same time, has a function of positioning fiber grating, i.e. detecting the position of the fiber-grating sensor in an optical fiber.
Description
Technical field
The utility model relates to and a kind ofly is enlarged into the distributed fiber grating sensing demodulation of the multiple spotization system on basis with impulse hunting, be used for to realize that single cover demodulated equipment monitors a plurality of fiber grating sensor wavelengths simultaneously and change.
Background technology
Along with fiber grating sensing technology in large bridge, building structure, health monitoring application in engineering such as (SHM), more and more need to have big, the highly sensitive and lower-cost fiber grating sensing demodulation of capacity sensor system.The technology that is used for fiber grating demodulation at present mainly comprises the scan-filtering method, and the body phase grating is in conjunction with CCD method, interferometer mode etc.But research and engineering is actual shows, the capacity sensor of these technical methods is limited at present, be that the number of sensors that can hold of the every passage of demodulating system is limited, and actual engineering needs sensor monitoring points up to a hundred even more sometimes, for example in the long-term health monitoring of some heavy construction structures such as long span bridge beam, tunnel, landslide etc., often requirement can be laid big quantity sensor in very big measuring distance, accurately measure the structural failure degree, to satisfy structural entity and local monitoring and evaluation simultaneously, this long-term health to large scale structure detects significant.
Summary of the invention
It is at above-mentioned the deficiencies in the prior art that the utility model is wanted the technical matters of final result, be enlarged into the basic distributed fiber grating sensing demodulation of multiple spotization system and provide a kind of with impulse hunting, be used for realizing that list overlaps demodulated equipment and monitors a plurality of fiber grating sensor wavelengths variations simultaneously.Capacity sensor is big, and stability and repeatability are good, the precision height, and cost is low.
For solving the problems of the technologies described above, a kind of distributed fiber grating sensing demodulation of multiple spotization system that is enlarged into the basis with impulse hunting of the utility model, utilize the technology of impulse hunting method, realization is to the amplification of a plurality of fiber grating reflected light signals in the passage, realize that single cover demodulated equipment monitors a plurality of fiber grating sensor wavelengths simultaneously and change, the concrete technical scheme of the utility model is as follows:
The distributed fiber grating sensing demodulation of a kind of multiple spotization system is characterized in that: comprise that pulse wide-band optical amplifier, coupling mechanism, circulator, optical fiber optical grating array, pulse generation and control module, isolator, boundary filter, photodetector, data collecting card, signal analysis and processing part and computer show; Described optical fiber optical grating array is in series by plural fiber grating; The output terminal of described pulse wide-band optical amplifier connects the input end of coupling mechanism, coupling mechanism has two output terminals, first output terminal of coupling mechanism connects first port of circulator, second port of circulator connects optical fiber optical grating array, circulator the 3rd port connects the input end of pulse wide-band optical amplifier, and second output terminal of coupling mechanism is connected described isolator, boundary filter, photodetector, data collecting card, signal analysis and processing partly successively and computer shows.
Also be connected to a photoswitch with a plurality of and output port behind second port of described circulator, described optical fiber optical grating array is connected on each and the output port of photoswitch.
The utility model boundary filter refers to the wave filter that its sideband rising edge or negative edge have certain bandwidth, be that rising edge or negative edge bandwidth are generally 1 nanometer to tens nanometer, include but not limited to Coarse Wave Division Multiplexer, dense wave division multiplexer, grating filter, filter plate, optical semiconductor wave filter, interfere type optical filter etc.;
The utility model is a kind of distributed fiber grating sensing demodulation of multiple spotization system of amplifying based on impulse hunting, the pulse wide-band optical amplifier sends the pulse broadband light, enter the coupling mechanism input end, first output port by coupling mechanism enters circulator first port then, enter the fiber-optic grating sensor array by circulator second port then and be reflected, the pulsed light of reflection enters pulse wide-band optical amplifier input port by circulator the 3rd port, forms the circulation vibration.The pulse wide-band optical amplifier produces light pulse by pulse producer control.Be exaggerated fiber grating reflected impulse light in the oscillatory process by second output terminal outgoing of coupling mechanism, pass through isolator and boundary filter successively, enter photodetector then.Data collecting card is gathered the output signal of photodetector, after the signal analysis and processing part, shows testing result at computer, with the variation of the pulse-echo signal of observing fiber-optic grating sensor.
Compared with prior art, the advantage that the utlity model has:
1. can monitor tens to up to a hundred optic fiber grating wavelengths variations in the passage simultaneously;
2. has the fiber grating positioning function, i.e. detection optical fiber grating sensor residing position in optical fiber.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model optical fiber optical grating array.
Fig. 3 is the structural representation of the utility model a plurality of optical fiber optical grating arrays in parallel.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated, but should not limit protection domain of the present utility model with this.
As shown in Figure 1, pulse wide-band optical amplifier 1 sends time dependent wideband pulse light of recurrent interval and enters coupling mechanism 2, and wherein one road light enters fiber-optic grating sensor array 4 backs by each optical grating reflection by first output port of coupling mechanism 2 through circulator 3 as sense light.Reflected light enters pulse wide-band optical amplifier 1 by circulator 3, forming the circulation vibration amplifies, the pulse of pulse wide-band optical amplifier 1 and interval time thereof are by pulse generation and control module 5 controls, reflection light pulse after vibration is amplified passes through isolator 6 and boundary filter 7 successively by second output port of coupling mechanism 2, enters photodetector 8 then.The current signal that light signal is exported behind photodetector 8 is gathered by data collecting card 9, is analyzed by 10 pairs of signals of signal analysis and processing part then, and the fiber grating reflected light signal that obtains comprising in the current signal changes, and shows 11 by computer then.Optical fiber optical grating array 4 is composed in series as shown in Figure 2 by a plurality of antiradar reflectivity fiber gratings 13, its wavelength is positioned at boundary filter 7 sideband scopes, fiber grating 13 can be inscribed by phase mask plate or laser pointwise and be made, so the step distance that the reflection wavelength of fiber grating can be write by pitch or the pointwise of phase mask plate determines that the fiber grating reflectivity can be regulated by inscribing intensity.
Pulse wide-band optical amplifier 1 sends time dependent wideband pulse light of recurrent interval and enters coupling mechanism 2, and wherein one road light enters fiber-optic grating sensor array 4 backs by each optical grating reflection by first output port of coupling mechanism 2 through circulator 3 as sense light.Reflected light enters pulse wide-band optical amplifier 1 by circulator 3, enter optical fiber optical grating array 4 again by coupling mechanism 2 first output ports and circulator 3 then and be reflected, and then enter amplifier 1, and forming the circulation vibration and amplify, circulation repeatedly back is saturated until reflected optical power.Reflected light after saturated through isolator 6 and boundary filter 7, enters photodetector 8 by by the output of coupling mechanism 2 second output ports then.Because all grating wavelengths all are positioned at boundary filter 7 sidebands in the optical fiber optical grating array, certain grating reflection wavelength shift of therefore working as optical fiber optical grating array 4, its corresponding intensity also can change thereupon, survey this optical grating reflection pulse strength by photodetector 8, analyzing this optical grating reflection pulse strength of contrast reflection by Digital Signal Analysis and Processing part 10 changes, perhaps correlativity changes, and can demodulate the corresponding wavelength variations of this grating.Utilize 5 gating pulse interval times of pulse generation and control module, can select any one grating reflection light pulse in optical fiber optical grating array 4 arrays to be exaggerated and go forward side by side into photodetector 8.By determining stop position simultaneously interpulse period.In addition, because these fiber grating reflectivity in the optical fiber optical grating array 4 are lower, therefore, the wavelength of these gratings can be identical, also can be inequality, so the fiber-optic grating sensor number that passage of this system can hold can reach dozens or even hundreds of.
More if desired measurement points can connect a photoswitch 12 in circulator 3 backs, and as shown in Figure 3, all the other connected modes remain unchanged.Photoswitch 12 has a plurality of and output port, in order to a plurality of optical fiber optical grating arrays 4 of parallel connection, by the switching of photoswitch 12 output ports, monitor the fiber-optic grating sensor array wavelength variations of photoswitch 12 each output port in turn, can greatly increase the fiber-optic grating sensor number that system can hold.
Claims (2)
1. the distributed fiber grating sensing demodulation of a multiple spotization system is characterized in that: comprise that pulse wide-band optical amplifier, coupling mechanism, circulator, optical fiber optical grating array, pulse generation and control module, isolator, boundary filter, photodetector, data collecting card, signal analysis and processing part and computer show; Described optical fiber optical grating array is in series by plural fiber grating; The output terminal of described pulse wide-band optical amplifier connects the input end of coupling mechanism, coupling mechanism has two output terminals, first output terminal of coupling mechanism connects first port of circulator, second port of circulator connects optical fiber optical grating array, circulator the 3rd port connects the input end of pulse wide-band optical amplifier, and second output terminal of coupling mechanism is connected described isolator, boundary filter, photodetector, data collecting card, signal analysis and processing partly successively and computer shows.
2. the distributed fiber grating sensing demodulation of multiple spotization according to claim 1 system, it is characterized in that: also be connected to a photoswitch with a plurality of and output port behind second port of described circulator, described optical fiber optical grating array is connected on each and the output port of photoswitch.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245422A (en) * | 2013-05-14 | 2013-08-14 | 东南大学 | Sensing demodulation system of multi-point distributed optical fiber bragg grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103245422A (en) * | 2013-05-14 | 2013-08-14 | 东南大学 | Sensing demodulation system of multi-point distributed optical fiber bragg grating |
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Granted publication date: 20131009 Termination date: 20160514 |
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| CF01 | Termination of patent right due to non-payment of annual fee |