CN103528608A - Multimode optical fiber speckle sensing system based on charge coupled device (CCD) partition positioning - Google Patents
Multimode optical fiber speckle sensing system based on charge coupled device (CCD) partition positioning Download PDFInfo
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- CN103528608A CN103528608A CN201310519804.8A CN201310519804A CN103528608A CN 103528608 A CN103528608 A CN 103528608A CN 201310519804 A CN201310519804 A CN 201310519804A CN 103528608 A CN103528608 A CN 103528608A
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Abstract
The invention relates to a multimode optical fiber speckle sensing system based on charge coupled device (CCD) partition positioning. The system comprises a laser light source, a sensing head, an imaging device and a monitoring device which are connected with one another sequentially, wherein the sensing head is formed by bended multimode optical fibers and is used for feeling external disturbance information; the imaging device comprises a collimating lens and an imaging lens and is used for collimating and imaging laser which is transmitted by the multimode optical fibers; the sensing head is positioned between the laser light source and the collimating lens; the monitoring device comprises a CCD, a data acquisition card and a computer; the CCD and the data acquisition card are used for realizing partitioned acquisition of the disturbance information transmitted among a plurality of multimode optical fibers; the computer is used for monitoring and analyzing the disturbance information, received by the multimode optical fibers in a real-time manner and finishing positioning of the external disturbance information; the output end of the imaging lens is connected with the input end of the CCD; the output end of the CCD is connected with the data acquisition card and the computer sequentially. The multimode optical fiber speckle sensing system based on CCD partition positioning is simple in structure and low in cost, and is not limited by geographical environment and monitoring distance.
Description
Technical field
The present invention relates to a kind of speckle sensor-based system, relate in particular to a kind of multimode optical fiber speckle sensor-based system based on CCD subregion location.
Background technology
Due to high monochromaticity, high brightness and the high directivity of laser itself, in six fields such as industry, medical treatment, business, scientific research, information and military affairs, be widely used.But the height coherence of laser, can make laser when imaging, produce laser speckle.At this, we utilize this characteristic of laser, and laser coupled is entered to multimode optical fiber transmission, and after collimation, imaging, speckle pattern information laser being formed in imaging process by CCD and data collecting card is presented on computer screen in real time.When multimode optical fiber is subject to extraneous disturbance, the phase place of laser changes, the variation of phase place causes the variation of speckle pattern, the variation of speckle pattern has reflected the disturbance information that multimode optical fiber is subject to, with regard to having realized disturbance information to external world, carry out Real-Time Monitoring like this, and the difference that speckle pattern changes has reflected the different disturbance information that multimode optical fiber is subject to.In addition, utilize the subregion of CCD can realize the location of disturbance information to external world, speckle sensor-based system can be applicable to the warning system of Real-Time Monitoring, has very important significance in practice.
Not only complex structure, cost were high for traditional positioning sensor system in the past, and were mostly limited to the impact of geographical environment, monitoring distance.
Summary of the invention
The object of the present invention is to provide a kind of multimode optical fiber speckle sensor-based system based on CCD subregion location, it is simple in structure, cost is low, and is not limited to the impact of geographical environment, monitoring distance.
Technical scheme of the present invention is:
A multimode optical fiber speckle sensor-based system for CCD subregion location, comprises the LASER Light Source, sensing head, imaging device and the monitoring device that connect successively;
It is characterized in that:
Described sensing head is to be formed by crooked multimode optical fiber, for experiencing extraneous disturbance information;
Imaging device comprises collimation lens and imaging len, for the laser to after multimode optical fiber transmission, collimates and imaging; Described sensing head is between LASER Light Source and collimation lens;
Monitoring device comprises CCD, data collecting card and computing machine; Described CCD and data collecting card gather for realizing the disturbance information that subregion transmits a plurality of multimode optical fibers, and described computing machine carries out Real-Time Monitoring and analysis for the disturbance information that multimode optical fiber is subject to, and completes the location of disturbance information to external world; The output terminal of imaging len connects the input end of CCD, and the output terminal of CCD is connection data capture card and computing machine successively;
The described multimode optical fiber speckle sensor-based system based on CCD subregion location, described monitoring device can obtain the relation between speckle image changes and sensing head is subject to disturbance information with the two width speckle images that CCD and data collecting card are disturbed the sensing head collecting before and after information, by this relation, realizes subregion location, sensing and the monitoring of disturbance information to external world.
The described multimode optical fiber speckle sensor-based system based on CCD subregion location, in the situation that CCD resolution and speckle pattern information can accuracy of detection allow, can carry out a plurality of subregions to CCD.
The described multimode optical fiber speckle sensor-based system based on CCD subregion location, what the multimode optical fiber in described sensing head adopted is polymethylmethacrylate multimode optical fiber.
Advantage of the present invention and positive effect:
The subregion of the high coherence that this invention has well utilized laser formed speckle pattern and CCD in imaging process, has solved the problem that traditional positioning sensor system faces.When sensing head is subject to extraneous disturbance, in the reflected version of inside of optical fibre, there is violent change in the reflected light in multimode optical fiber, between various patterns, there is the function that high frequency is beated in final mode of laser field of realizing output, thereby at multimode optical fiber output terminal, obtaining transmitting optical signal changes, the speckle pattern showing in real time on computing machine also can change, this variation has just reflected the extraneous disturbance information that sensing head is experienced, and the difference variation of speckle pattern has reflected different external disturbance information.What the CCD of subregion collected is the disturbance information that the corresponding sensing head of each subregion is subject to, and when the speckle pattern real-time monitoring changes, can realize the location to disturbance information.The present invention adopts technique scheme, disclose a kind of multimode optical fiber and CCD subregion of well utilizing and disturbance information has been positioned to the system of sensing, while is with respect to other positioning sensor system, this method is simple in structure, cost is low, can realize Real-Time Monitoring, in orientation sensing field, also has very large advantage.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention;
Fig. 2 is the schematic diagram of sensing head of the present invention;
Fig. 3 is the schematic diagram of CCD subregion;
Fig. 4 is embodiments of the present invention structural representation.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
As shown in Figure 1, be general structure schematic diagram of the present invention, the multimode optical fiber speckle sensor-based system based on CCD subregion location comprises LASER Light Source 201, sensing head 202, imaging device 203, monitoring device 204.
Sensing head 202 comprises crooked multimode optical fiber 301, when sensing head 202 is subject to extraneous disturbance information, there is violent change in the reflected version of inside of optical fibre in the reflected light of transmission in multimode optical fiber 301, between various patterns, there is the function that high frequency is beated in final mode of laser field of realizing output, thereby at multimode optical fiber output terminal, obtaining transmitting optical signal changes, through collimation, after imaging, the speckle pattern information showing in real time on computing machine also can change, this reacting condition be the external disturbance information that sensing head is experienced, the difference of speckle pattern changes the different disturbance information of reflection.
Imaging device 203 comprises collimation lens 501, imaging len 502: laser from multimode optical fiber 301 output terminals outputs through collimation lens 501 and imaging len 502 imagings.
Monitoring device 204 comprises CCD 503, data collecting card 504, computing machine 505: after laser imaging by CCD 503 and data collecting card 504 the speckle information to each multimode optical fiber output terminal, via computing machine 505, show in real time, by the data processing module of computing machine, speckle pattern information has been analyzed to sensing and the location of disturbance information to external world.
This invention has solved the problem that traditional positioning sensor system will face, have simple in structure, cost is low, can Real Time Monitoring etc. feature, there is good application prospect.
Fig. 2 has shown the schematic diagram of transducing part of the present invention, wherein 301 is multimode optical fiber, using crooked multimode optical fiber 301 as sensing head 202, when sensing head 202 is experienced extraneous disturbance information, can pass to monitoring device 204 by multimode optical fiber 301, reach the object of speckle sensing.
Fig. 3 is the schematic diagram (district of Fen Liaojiuge shown in Fig. 3) of CCD subregion, in the situation that CCD resolution and speckle pattern information can accuracy of detection allow, can carry out a plurality of subregions to CCD, CCD connects the output terminal of imaging device, when certain sensing head is subject to external interference, change with the corresponding CCD of sensing head region pattern, thereby realized the location of disturbance information to external world by monitoring analysis.
Fig. 4 is embodiments of the present invention schematic diagram, wherein 201 is LASER Light Source, the laser coupled that LASER Light Source 201 is sent enters multimode optical fiber 301, when sensing head 202 is experienced extraneous disturbance information, in the reflected version of inside of optical fibre, there is violent change in the reflected light in multimode optical fiber 301, between various patterns, there is the function that high frequency is beated in final mode of laser field of realizing output, thereby at multimode optical fiber 301 output terminals, obtaining transmitting optical signal changes, through collimation, after imaging, the speckle pattern showing in real time on computing machine 505 also can change, this variation has just reflected the extraneous disturbance information that sensing head 202 is experienced.The difference of speckle pattern has reflected different external disturbance information.CCD 503 and data collecting card 504 sensing head collecting 202 is subject to before disturbance and disturbance after two width speckle images carry out that gray-scale value subtracts each other, gradation of image enhancing, filtering, binaryzation and morphology processing, finally image is carried out to skeleton line extraction, can obtain the relation between speckle image variation and sensing head 202 deformation, by this relation, realize the orientation sensing to disturbance information.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (4)
1. the multimode optical fiber speckle sensor-based system based on CCD subregion location, comprises the LASER Light Source, sensing head, imaging device and the monitoring device that connect successively;
It is characterized in that:
Described sensing head is to be formed by crooked multimode optical fiber, for experiencing extraneous disturbance information;
Imaging device comprises collimation lens and imaging len, for the laser to after multimode optical fiber transmission, collimates and imaging; Described sensing head is between LASER Light Source and collimation lens;
Monitoring device comprises CCD, data collecting card and computing machine; Described CCD and data collecting card gather for realizing the disturbance information that subregion transmits a plurality of multimode optical fibers, and described computing machine carries out Real-Time Monitoring and analysis for the disturbance information that multimode optical fiber is subject to, and completes the location of disturbance information to external world; The output terminal of imaging len connects the input end of CCD, and the output terminal of CCD is connection data capture card and computing machine successively.
2. the multimode optical fiber speckle sensor-based system of locating based on CCD subregion according to claim 1, it is characterized in that: described monitoring device can obtain the relation between speckle image changes and sensing head is subject to disturbance information with the two width speckle images that CCD and data collecting card are disturbed the sensing head collecting before and after information, by this relation, realizes subregion location, sensing and the monitoring of disturbance information to external world.
3. the multimode optical fiber speckle sensor-based system based on CCD subregion location according to claim 2, is characterized in that: in the situation that CCD resolution and speckle pattern information can accuracy of detection allow, can carry out a plurality of subregions to CCD.
4. the multimode optical fiber speckle sensor-based system based on CCD subregion location according to claim 3, is characterized in that: what state that multimode optical fiber in sensing head adopts is polymethylmethacrylate multimode optical fiber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825448A (en) * | 2018-06-25 | 2018-11-16 | 江苏金风科技有限公司 | The detection method and detection system of static deformation |
| CN110346308A (en) * | 2018-04-02 | 2019-10-18 | 中国计量大学 | A kind of electronic speckle spectrometer of intermode interference |
-
2013
- 2013-10-30 CN CN201310519804.8A patent/CN103528608A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346308A (en) * | 2018-04-02 | 2019-10-18 | 中国计量大学 | A kind of electronic speckle spectrometer of intermode interference |
| CN110346308B (en) * | 2018-04-02 | 2021-12-14 | 中国计量大学 | Electronic speckle spectrograph for intermode interference |
| CN108825448A (en) * | 2018-06-25 | 2018-11-16 | 江苏金风科技有限公司 | The detection method and detection system of static deformation |
| CN108825448B (en) * | 2018-06-25 | 2019-12-24 | 江苏金风科技有限公司 | Detection method and detection system for static deformation |
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