CN2869788Y - Multiplexing and demodulating device to sensor based on long-period optical fiber grating - Google Patents
Multiplexing and demodulating device to sensor based on long-period optical fiber grating Download PDFInfo
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- CN2869788Y CN2869788Y CN 200520115947 CN200520115947U CN2869788Y CN 2869788 Y CN2869788 Y CN 2869788Y CN 200520115947 CN200520115947 CN 200520115947 CN 200520115947 U CN200520115947 U CN 200520115947U CN 2869788 Y CN2869788 Y CN 2869788Y
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 19
- 101000802091 Homo sapiens Thyroid hormone-inducible hepatic protein Proteins 0.000 claims abstract description 14
- 102100034700 Thyroid hormone-inducible hepatic protein Human genes 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims description 37
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 description 5
- 238000005253 cladding Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000012792 core layer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011551 heat transfer agent Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
This new utility model relates to one reusable and demodulate device of sensor on basis of optical fiber and grating over long period. This model comprises n LPGP sensors in series of different grating C/C distances. All the input terminals are connected with light signals of broad-band light source by optical fiber coupling and all output terminals with light signal of the other optical fiber coupling. Input terminal of light separator for single direction is connected with light signal of the other optical fiber coupling, and the output terminal and input terminal of photoelectric diode are connected with light signal at one end of 3-d B optical-fiber coupling. Output terminal of photoelectric diode is connected with data-collecting card electrically. The other end of 3-d B optical-fiber coupling is apart connected with light signals of two optical-fiber collimator. The two optical-fiber collimators are arranged with two corresponding reflectors, one of which the movement of location is controlled by stepping motor.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, particularly a kind of based on the multiplexing and demodulating equipment of long period fiber grating to sensor.
Background technology
At sensory field of optic fibre, long period fiber grating is to (long-period grating pair, LPGP) because it is very responsive to little curved, temperature, stress, variations in refractive index, and become crucial senser element in the industry, be particularly useful for the high-acruracy survey of liquid refractivity.Utilize first long period fiber grating that the fiber core layer luminous energy is coupled half to fibre cladding, through the propagation of stretch journey again by second grating sandwich layer that is coupled back, converge with second half light through sandwich layer, long period fiber grating is Mach-Zehnder (M-Z) interferometer of two arms in fact having constituted one with fiber core layer and covering.Because the fibre cladding effective refractive index is subjected to the influence of extraneous refractive index, the optical path difference of these M-Z interferometer two arms variations in refractive index to external world is very responsive.Utilize the method for wavelength-modulated, the T.Allsop of UK is used for refractive index sensing with a LPGP, has obtained 1.8 * 10
-6Precision.Awl and lithographic technique are drawn in the utilization of domestic Zhejiang University, and that section optical fiber in the middle of the grating pair is handled, and improve the influence degree of extraneous refractive index to cladding index, and measurement sensitivity has been improved more than five times.But long period fiber grating, its spectrum signature are a plurality of transmission losss peak and deposit, and the relative broad of the frequency domain bandwidth of each loss peak (tens of nm), can't realize multiplexing and demodulation on frequency domain.Although long period fiber grating itself has the sensing characteristics to little curved, temperature, stress, refractive index sensitivity, it seldom is used to distributed measurement.As a same reason, so far, also nobody propose a kind of efficient cheapness based on the multiplexing and demodulating equipment of long period fiber grating to sensor.
Summary of the invention
The purpose of this utility model is exactly at the deficiencies in the prior art, has proposed a kind of based on the technical scheme of long period fiber grating to the multiplexing and demodulating equipment of sensor.
The utility model comprises the LPGP sensor of the individual different grating centre distances of n (n 〉=2) in parallel, and its input end all is connected with the wideband light source light signal by fiber coupler, and output terminal all is connected with another fiber coupler light signal.Light one-way isolator input end is connected with another fiber coupler light signal, and the input end of its output terminal and photodiode is connected with an end light signal of 3-dB fiber coupler, and photodiode output is electrically connected with data collecting card.The other end of 3-dB fiber coupler is connected with two optical fiber collimator light signals respectively, and corresponding two optical fiber collimator positions are provided with two catoptrons, and one of them catoptron moves by its position of step motor control.
The present invention mainly is applicable to the demodulation of multiplexed LPGP sensor signal, spatial resolution is up to tens of microns, the maximum demodulation number of channel reaches hundreds of, can reach very high measuring accuracy by processing to interference signal, compare frequency domain measurement instruments such as those spectrometers simultaneously, have advantage with low cost, be fit to integrated and instrumentation.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present utility model.
Embodiment
As shown in Figure 1, LPGP sensor 3 input ends of a plurality of different grating centre distances (L) in parallel are connected with wideband light source 1 light signal by fiber coupler 2 respectively, and output terminal is connected with another fiber coupler 4 light signals.Light one-way isolator 5 input ends are connected with fiber coupler 4 light signals, its output terminal be connected with an end light signal of 3-dB fiber coupler 6 with the input end of photodiode 10, the output terminal of photodiode 10 is electrically connected with data collecting card 11.The other end of 3-dB fiber coupler 6 is connected with two optical fiber collimator 7 light signals respectively, and corresponding two optical fiber collimator 7 positions are provided with two catoptrons 8, and one of them catoptron moves by stepper motor 9 its positions of control.Above-mentioned a plurality of LPGP sensors 3 are embedded in the monitored buildings as microbend sensor, wideband light source 1 and signal demodulation part are all in monitoring center, broadband light enters a plurality of LPGP sensors 3 by single-mode fiber, passes flashlight back monitoring center by single-mode fiber again and carries out signal demodulation and processing.
During work, with the LPGP sensor of light intensity mean allocation to a plurality of different grating centre distances, the light signal in each LPGP sensor is introduced different optical path differences to wideband light source by fiber coupler; The flashlight that carries each road LPGP heat transfer agent converges to a single-mode fiber by fiber coupler, finishes the multiplexed of transducing signal.Transducing signal after multiplexed enters a 3-dB fiber coupler through a light one-way isolator, and the 3-dB fiber coupler is divided into aplanatic two bundles with light signal; The aplanatic flashlight of two bundles incides on the catoptron by optical fiber collimator respectively and reflects coupled back into optical fibers; Move by the position of controlling one of them catoptron, make between the two paths of signals light and to introduce another and go into optical path difference, and produce scanning, thereby compensate the optical path difference that the LPGP sensor of different grating centre distances is introduced.The effect of one-way isolator mainly is to prevent the destruction of reflected light to light source.Two ways of optical signals after the compensation is converged interference in the 3-dB coupling mechanism, interference signal is converted into electric signal through an arm of 3-dB coupling mechanism by photodiode, by the data collecting card collection, finishes demodulation.
Claims (1)
1, based on the multiplexing and demodulating equipment of long period fiber grating to sensor, comprise n LPGP sensor (3) in parallel, n 〉=2 wherein, the grating centre distance difference that it is characterized in that described each LPGP sensor (3), its input end all is connected with wideband light source (1) light signal by fiber coupler (2), and output terminal all is connected with another fiber coupler (4) light signal; Light one-way isolator (5) input end is connected with fiber coupler (4) light signal, the input end of its output terminal and photodiode (10) is connected with an end light signal of 3-dB fiber coupler (6) respectively, and the output terminal of photodiode (10) is electrically connected with data collecting card (11); The other end of 3-dB fiber coupler (6) is connected with two optical fiber collimators (7) light signal respectively, and corresponding two optical fiber collimators (7) position is provided with two catoptrons (8), and one of them catoptron is controlled its position by stepper motor (9) and moved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115947 CN2869788Y (en) | 2005-11-02 | 2005-11-02 | Multiplexing and demodulating device to sensor based on long-period optical fiber grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115947 CN2869788Y (en) | 2005-11-02 | 2005-11-02 | Multiplexing and demodulating device to sensor based on long-period optical fiber grating |
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| CN2869788Y true CN2869788Y (en) | 2007-02-14 |
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| CN 200520115947 Expired - Fee Related CN2869788Y (en) | 2005-11-02 | 2005-11-02 | Multiplexing and demodulating device to sensor based on long-period optical fiber grating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102999A (en) * | 2010-12-16 | 2011-06-22 | 华中科技大学 | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array |
| CN101383676B (en) * | 2008-10-14 | 2012-07-04 | 李东升 | Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof |
| CN101383677B (en) * | 2008-10-14 | 2013-03-27 | 山东大学 | Star type optical fiber grating sensing network based on CDMA multiplexing and demodulation method |
-
2005
- 2005-11-02 CN CN 200520115947 patent/CN2869788Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383676B (en) * | 2008-10-14 | 2012-07-04 | 李东升 | Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof |
| CN101383677B (en) * | 2008-10-14 | 2013-03-27 | 山东大学 | Star type optical fiber grating sensing network based on CDMA multiplexing and demodulation method |
| CN102102999A (en) * | 2010-12-16 | 2011-06-22 | 华中科技大学 | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array |
| CN102102999B (en) * | 2010-12-16 | 2012-09-05 | 华中科技大学 | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |