CN2581943Y - High-precision multi-channel Bragg optical fibre raster sensor - Google Patents
High-precision multi-channel Bragg optical fibre raster sensor Download PDFInfo
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- CN2581943Y CN2581943Y CN 02257191 CN02257191U CN2581943Y CN 2581943 Y CN2581943 Y CN 2581943Y CN 02257191 CN02257191 CN 02257191 CN 02257191 U CN02257191 U CN 02257191U CN 2581943 Y CN2581943 Y CN 2581943Y
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- hyperchannel
- sensing device
- bragg grating
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Abstract
The utility model relates to a high-precision multi-channel Bragg optical fiber raster sensor, which comprises one or more than one optical fiber raster probe, the optical fiber raster probe is connected with a coupler via an optical switch, and the coupler is respectively connected with a wide-band light source and a demodulator. The utility model is characterized in that the optical switch is also connected with a wavelength standard within the range of the operating wavelength of the optical fiber raster probe. The utility model having the advantages of high precision and low cost can be widely used for simultaneously monitoring the multiple points or measuring the distribution of a certain structural stress of large buildings, bridges, drilling platforms, oil field wells, etc.
Description
Technical field
The utility model relates to a kind of apparatus for sensing demodulating, particularly a kind of hyperchannel sensing and demodulating Bragg fiber grating device that utilizes the multi-wavelength standard.
Background technology
The bragg grating sensor is a sensor of making variable quantities such as probe detected pressures, strain and temperature with bragg grating, its ultimate principle is to utilize wide spectrum light source (as SLED) will have the light of certain bandwidth to import in the fiber grating by coupling mechanism, because the wavelength selectivity effect of fiber grating, qualified light is reflected, send into the reflection wavelength variation that demodulating equipment is measured fiber grating by coupling mechanism again, demodulating equipment is promptly derived extraneous dut temperature, pressure or stress by detecting wavelength change.At present, the cost of bragg grating sensor is mainly on measuring sonde and demodulated equipment.When multiple spots such as building, bridge, dam being monitored simultaneously or during to a certain structural stress distribution measuring, then needing a large amount of measuring sondes and demodulating equipment thereof, thereby produce big expense.
The utility model content
The utility model solves in the prior art bragg grating sensor and carries out multiple spot high problem of cost when detecting and measuring, and designs a kind of precision height, bragg grating sensor that cost is low.
The technical solution of the utility model is such: the utility model comprises one or more fiber grating probes, described fiber grating probe links to each other with coupling mechanism by a photoswitch, described coupling mechanism links to each other with demodulating equipment with a wide spectrum light source respectively, it is characterized in that: described photoswitch also is connected with a standard of wavelength device in the operating wave scope of described fiber grating probe.
Described photoswitch is the photoswitch of a 1*N.
Be provided with temperature control equipment in the described standard of wavelength device.
Described coupling mechanism can be a circulator, and described circulator has three ports.
Described coupling mechanism also can be a broadband optical fiber coupler.
Described demodulating equipment is by tunable scanning filter, the D/A card, and the A/D card, photelectric receiver is formed, and is connected with DSP between described D/A card and the described A/D card.
Described demodulating equipment is by tunable scanning filter, the D/A card, and the A/D card, photelectric receiver is formed, and electronic circuit action and data processing between described D/A card and the described A/D card are coordinated by DSP, and carry out communication with PC.
Be provided with temperature control equipment in the above-mentioned scanning filter.
Because the utility model is provided with the standard of wavelength device in the operating wavelength range of fiber grating probe, can carry out verification to the wavelength in the light path, thereby the non-linear of tunable scanning filter effectively proofreaied and correct, measuring accuracy of the present utility model is improved greatly, correspondingly the sensitivity to the fiber grating probe requires to reduce, adopt the low fiber grating probe of sensitivity can save cost, the number of sensors of unit path channels increases simultaneously, relatively also provides cost savings.
The utility model adopts the photoswitch of a 1*N between coupling mechanism and a plurality of fiber grating probe, promptly adopt MEMS or other optical switching technique, can be between a plurality of fiber gratings probe switching-over light path fast, make a demodulating equipment can be a plurality of probe services, thereby reduced cost more.
Adopt the coupling mechanism of circulator, can guarantee that the light that reflects all enters in the demodulating equipment, further the requirement to signal intensity and decay reduces.Under the strong situation of measuring-signal, also can use fiber coupler instead, further reduce cost.
Standard of wavelength device and scanning filter (Tunable filter) inside all has temperature stabilizer to make to the utlity model has high precision and job stability.
Description of drawings:
Accompanying drawing is the structural representation of the utility model embodiment 1.
Embodiment:
Embodiment 1: present embodiment is preferred embodiment.See Fig. 1, in the present embodiment, the utility model comprises two fiber grating probes 1, photoswitch 4 is for adopting the 1*3 photoswitch of MEMS technology, present embodiment directly replaces directional coupler with circulator 2, and circulator 2 has three ports, and wide spectrum light source 3 links to each other with a port of circulator 2, second port of circulator 2 links to each other with photoswitch 4, and the 3rd port links to each other with demodulating equipment.Photoswitch 4 links to each other with two fiber grating probes 1, and other has a standard of wavelength device 5 photoswitches 4 to link to each other, and the wavelength coverage of its verification is in the operating wavelength range of fiber grating probe 1.Demodulating equipment is by tunable scanning filter 6, D/A card 7, and A/D card 8, photelectric receiver 9 is formed, and is connected with DSP10 between D/A card 7 and the A/D card 8, and described DSP10 links to each other with PC 11.Electronic circuit action and data processing between D/A card 7 and the A/D card 8 are coordinated by DSP10, and carry out communication with PC 11.
Standard of wavelength device 5 and scanning filter 6 (Tunable filter) inside all has temperature stabilizer to make to the utlity model has high precision and job stability.
Photoswitch 4 can be between two fiber gratings probe 1 switching-over light path, when wanting the verification wavelength, also can switch on the standard of wavelength device 5.When switching to some fiber gratings probe and go up, enter this fiber grating probe through circulator 2 and photoswitch 4 from the light of wide spectrum light source 3 emissions.Because the selection effect of fiber grating, the wavelength that meets Bragg condition is reflected back, and through photoswitch 4, enters circulator 2, outputs to tunable scanning filter 6 from the 3rd port of circulator 2.Under the effect of D/A card 7 under photelectric receiver 9 and the DSP10 adjusting and A/D card 8, measure wavelength data.
Claims (8)
1. a high precision, hyperchannel bragg grating sensing device, comprise the fiber grating probe, described fiber grating probe links to each other with coupling mechanism by a photoswitch, described coupling mechanism links to each other with demodulating equipment with a wide spectrum light source respectively, it is characterized in that: described photoswitch also is connected with a standard of wavelength device in the operating wavelength range of described fiber grating probe.
2. high precision according to claim 1, hyperchannel bragg grating sensing device is characterized in that described photoswitch is the photoswitch of a 1*N.
3. high precision according to claim 1 and 2, hyperchannel bragg grating sensing device is characterized in that being provided with temperature control equipment in the described standard of wavelength device.
4. high precision according to claim 1 and 2, hyperchannel bragg grating sensing device is characterized in that described coupling mechanism is a circulator, and described circulator has three ports.
5. high precision according to claim 1 and 2, hyperchannel bragg grating sensing device is characterized in that described coupling mechanism is a broadband optical fiber coupler.
6. high precision according to claim 1 and 2, hyperchannel bragg grating sensing device, it is characterized in that described demodulating equipment is by tunable scanning filter, the D/A card, the A/D card, photelectric receiver is formed, be connected with DSP between described D/A card and the described A/D card, described DSP links to each other with PC.
7. high precision according to claim 1 and 2, hyperchannel bragg grating sensing device, it is characterized in that described demodulating equipment is by tunable scanning filter, the D/A card, the A/D card, photelectric receiver is formed, electronic circuit action and data processing between described D/A card and the described A/D card are coordinated by DSP, and carry out communication with PC.
8. high precision according to claim 7, hyperchannel bragg grating sensing device is characterized in that being provided with temperature control equipment in the above-mentioned scanning filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02257191 CN2581943Y (en) | 2002-09-29 | 2002-09-29 | High-precision multi-channel Bragg optical fibre raster sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02257191 CN2581943Y (en) | 2002-09-29 | 2002-09-29 | High-precision multi-channel Bragg optical fibre raster sensor |
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| Publication Number | Publication Date |
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| CN2581943Y true CN2581943Y (en) | 2003-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02257191 Expired - Fee Related CN2581943Y (en) | 2002-09-29 | 2002-09-29 | High-precision multi-channel Bragg optical fibre raster sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416323C (en) * | 2004-12-24 | 2008-09-03 | 山东省科学院激光研究所 | Fibre-optical and raster sensor system with multiple mould |
| CN101216327B (en) * | 2008-01-08 | 2010-10-13 | 西安石油大学 | High precision optical fiber grating sensing signal demodulation instrument |
| CN101881631A (en) * | 2010-06-02 | 2010-11-10 | 南京航空航天大学 | FBG (Fiber Bragg Grating) sensor network monitoring system based on photoswitch |
| CN102798486A (en) * | 2011-05-27 | 2012-11-28 | 上海华魏光纤传感技术有限公司 | System and method for online automatic calibration of attenuation parameter of detection optical cable |
| CN102928022A (en) * | 2012-11-20 | 2013-02-13 | 党学玲 | Optical fiber temperature and pressure monitoring system |
| CN108721723A (en) * | 2017-04-25 | 2018-11-02 | 福州高意光学有限公司 | A kind of femto-second laser therapeutic equipment |
-
2002
- 2002-09-29 CN CN 02257191 patent/CN2581943Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416323C (en) * | 2004-12-24 | 2008-09-03 | 山东省科学院激光研究所 | Fibre-optical and raster sensor system with multiple mould |
| CN101216327B (en) * | 2008-01-08 | 2010-10-13 | 西安石油大学 | High precision optical fiber grating sensing signal demodulation instrument |
| CN101881631A (en) * | 2010-06-02 | 2010-11-10 | 南京航空航天大学 | FBG (Fiber Bragg Grating) sensor network monitoring system based on photoswitch |
| CN102798486A (en) * | 2011-05-27 | 2012-11-28 | 上海华魏光纤传感技术有限公司 | System and method for online automatic calibration of attenuation parameter of detection optical cable |
| CN102928022A (en) * | 2012-11-20 | 2013-02-13 | 党学玲 | Optical fiber temperature and pressure monitoring system |
| CN108721723A (en) * | 2017-04-25 | 2018-11-02 | 福州高意光学有限公司 | A kind of femto-second laser therapeutic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |