CN101832794A - Fiber Bragg grating and fiber Raman composite sensing network and realizing method thereof - Google Patents

Fiber Bragg grating and fiber Raman composite sensing network and realizing method thereof Download PDF

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Publication number
CN101832794A
CN101832794A CN 201010136108 CN201010136108A CN101832794A CN 101832794 A CN101832794 A CN 101832794A CN 201010136108 CN201010136108 CN 201010136108 CN 201010136108 A CN201010136108 A CN 201010136108A CN 101832794 A CN101832794 A CN 101832794A
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China
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fiber
demodulator
fbg
grating
raman
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CN 201010136108
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Chinese (zh)
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CN101832794B (en
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周斌
何赛灵
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浙江大学
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Abstract

The invention discloses a fiber Bragg grating and fiber Raman composite sensing network and a realizing method thereof. A fiber Bragg grating demodulator and a fiber Raman demodulator in the invention are respectively connected to two incident ends of an optical switch, and the emergent ends of the optical switch are optically connected with the sensing network formed by connecting a plurality of sensing fibers with sensing fiber Bragg gratings in series. The sensing fiber Bragg gratings in the sensing network are formed by connecting the sensing fibers in series. The feature reflecting wavelengths of the sensing fiber Bragg gratings are greater than 0.8 nm at intervals so that the wavelength division multiplexing is realized. The sensing fibers are tightly attached with transmission wires on a power transmission network, and the sensing fiber Bragg gratings are tightly attached with key joints needing to be monitored in a switching station on the power transmission network. The fiber Bragg grating and fiber Raman composite sensing network has the advantages of more sensing nodes, high sensing precision of key zones, realization of real-time monitoring and no electromagnetic interference.

Description

A kind of fiber grating and fiber Raman composite sensing network and its implementation
Technical field
The invention belongs to technical field of optical fiber sensing, related to a kind of equipment that utilizes fiber grating (FBG) wavelength-division multiplex technique and fiber Raman effect to carry out the method for sensing network networking and realize this method, be applicable to the health monitoring of power transmission line and switchyard in the real-time sensing network, particularly high-voltage fence that needs multinode, high precision, anti-electromagnetic interference (EMI).
Background technology
Fiber grating owing to its distinctive inside of optical fibre sensitivity, Wavelength-encoding, be easy to a kind of important devices that advantages such as networking become Fibre Optical Sensor.Utilize wavelength-division multiplex technique, optical fiber optical grating array is widely used in the quasi-distributed sensing of optical fiber, as: the health monitoring of railway, bridge, dam etc., the monitoring temperature that the trunk power transmission line is along the line.Yet the use wavelength-division multiplex technique, the interval of the feature reflection wavelength of each fiber grating on the sensing network must be controlled at more than the 0.8nm, and this has just limited the sensing node number on the sensing network.
It is optical fiber distributed type sensing network network-building method commonly used that the fiber Raman effect has.Can do monitoring to temperature and stress along optical fiber.Yet at present the spatial resolution of commercial Raman fiber sensing goes for the health monitoring along power transmission line in the magnitude of rice, but needs pinpoint occasion at switchyard etc., just is difficult to competent.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, has used fiber grating and fiber Raman composite sensing network, has proposed a kind of solution that is directed to the high-voltage fence health monitoring.The present invention utilizes the mutual supplement with each other's advantages of fiber grating and these two technology of fiber Raman, and it is many to have a sensing node, and the sensing accuracy height of critical area can be realized the advantage that detects in real time.The equipment of realizing this method is provided simultaneously.
Technical solution technical scheme that problem is taked of the present invention is:
A kind of fiber grating and fiber Raman composite sensing network, the sensing network that comprises fiber Bragg grating (FBG) demodulator, fiber Raman (FBG) demodulator, photoswitch, forms by a plurality of sensor fibres and sensor fibre grating;
Fiber Bragg grating (FBG) demodulator and fiber Raman (FBG) demodulator light respectively are connected to two incident ends of photoswitch, and the exit end of photoswitch is connected with sensing network light by a plurality of sensor fibres and the series connection of sensor fibre grating.
Form by the sensor fibre serial connection between the sensor fibre grating in the described sensing network.
Feature reflection wavelength between described each sensor fibre grating more than 0.8nm, is realized wavelength-division multiplex at interval.
The online power transmission line of described sensor fibre and electric power transfer is close to, and the key joints that needs to monitor in the online switchyard of sensor fibre grating and electric power transfer is close to.
The concrete grammar of realizing fiber grating and fiber Raman composite sensing network is:
The working time of fiber Bragg grating (FBG) demodulator and fiber Raman (FBG) demodulator is controlled by photoswitch.When photoswitch was communicated with fiber Bragg grating (FBG) demodulator with sensing network, the broad band light beam by fiber Bragg grating (FBG) demodulator sends incided in the sensing network through photoswitch.Broad band light beam is by each sensor fibre grating filtering and reflection, reflected light is got back to fiber Bragg grating (FBG) demodulator by photoswitch, and fiber Bragg grating (FBG) demodulator comes the health status of key joints in the online switchyard of demodulation electric power transfer by the amount of movement that detects each sensor fibre grating feature reflection wavelength; When photoswitch was communicated with the fiber Raman (FBG) demodulator with sensing network, the pulse laser that is sent by the fiber Raman (FBG) demodulator incided in the sensing network by photoswitch.Laser is propagated along sensor fibre, and excites Raman diffused light dorsad.Raman diffused light is got back to the fiber Raman (FBG) demodulator through photoswitch dorsad.The fiber Raman (FBG) demodulator demodulates along the health status of sensor fibre length direction power transmission line diverse location according to the moment and the intensity of the Raman diffused light that receives.
Fiber Bragg grating (FBG) demodulator, fiber Raman (FBG) demodulator and photoswitch are matured product among the present invention.The present invention is suitable for the health monitoring of power transmission line and switchyard key joints in the electric power transmission network.
The present invention compares with traditional monitoring scheme, and it is many to have a sensing node, and the sensing accuracy height of critical area can be realized monitoring in real time, is not subjected to the advantage of electromagnetic interference (EMI).
Description of drawings
Fig. 1 is a structural representation of the present invention;
Embodiment
As shown in Figure 1, the equipment of a kind of fiber grating and fiber Raman composite sensing network comprise fiber Bragg grating (FBG) demodulator 1, fiber Raman (FBG) demodulator 2,1 * 2 photoswitch 3, by the sensing network 6 of a plurality of sensor fibres 4 with 5 one-tenth of sensor fibre grating groups;
Fiber Bragg grating (FBG) demodulator 1 and fiber Raman (FBG) demodulator 2 light respectively are connected to two incident ends of 1 * 2 photoswitch 3.The exit end of photoswitch 3 is connected with sensing network 6 light, is formed by sensor fibre 4 serial connections between the sensor fibre grating 5 in the sensing network 6.Centre wavelength between each sensor fibre grating 5 more than 0.8nm, realizes wavelength-division multiplex at interval.The online power transmission line of sensor fibre 4 and electric power transfer is close to, and the key joints that needs to monitor in sensor fibre grating 5 and the online switchyard of electric power transfer is close to.
Fiber Bragg grating (FBG) demodulator 1, fiber Raman (FBG) demodulator 2 and 1 * 2 photoswitch are matured product.
The concrete grammar of realizing fiber grating and fiber Raman composite sensing network is:
The working time of fiber Bragg grating (FBG) demodulator 1 and fiber Raman (FBG) demodulator 2 is by photoswitch 3 controls.When photoswitch 3 was communicated with fiber Bragg grating (FBG) demodulator 1 with sensing network 6, the broad band light beam by fiber Bragg grating (FBG) demodulator 1 sends incided in the sensing network 6 through 1 * 2 photoswitch 3.Broad band light beam is by each sensor fibre grating 5 filtering and reflection, reflected light is got back to fiber Bragg grating (FBG) demodulator 1 by photoswitch 3, and fiber Bragg grating (FBG) demodulator 1 comes the health status of key joints in the online switchyard of demodulation electric power transfer by the amount of movement that detects each sensor fibre grating 5 feature reflection wavelengths; When photoswitch 3 was communicated with the fiber Raman (FBG) demodulator with sensing network 6, the pulse laser that is sent by fiber Raman (FBG) demodulator 2 incided in the sensing network 6 by photoswitch 3.Laser is propagated along sensor fibre 4, and excites Raman diffused light dorsad.Raman diffused light is got back to fiber Raman (FBG) demodulator 2 through photoswitch 3 dorsad.Fiber Raman (FBG) demodulator 2 demodulates along the health status of sensor fibre 4 length direction power transmission line diverse locations according to the moment and the intensity of the Raman diffused light that receives.Fiber grating 5 limited amounts of 1 energy demodulation of fiber Bragg grating (FBG) demodulator, but this method sensor bearing accuracy height.And the sensing bearing accuracy of fiber Raman (FBG) demodulator 2 is not high, but the sensing node quantity of institute energy demodulation is very big.Therefore utilize fiber-optic grating sensor monitoring power transmission network key node and utilize the fiber Raman effect to monitor the method for power transmission network power transmission line health status, combine the advantage of above-mentioned two methods, compare with traditional monitoring scheme, it is many that the present invention has a sensing node, the sensing accuracy height of critical area, can realize monitoring in real time, not be subjected to the advantage of electromagnetic interference (EMI).

Claims (2)

1. fiber grating and fiber Raman composite sensing network, the sensing network that comprises fiber Bragg grating (FBG) demodulator, fiber Raman (FBG) demodulator, photoswitch, forms by a plurality of sensor fibres and sensor fibre grating, it is characterized in that: fiber Bragg grating (FBG) demodulator and fiber Raman (FBG) demodulator light respectively are connected to two incident ends of photoswitch, and the exit end of photoswitch is connected with sensing network light by a plurality of sensor fibres and the series connection of sensor fibre grating;
Form by the sensor fibre serial connection between the sensor fibre grating in the described sensing network;
Feature reflection wavelength between described each sensor fibre grating more than 0.8nm, is realized wavelength-division multiplex at interval;
The online power transmission line of described sensor fibre and electric power transfer is close to, and the key joints that needs to monitor in the online switchyard of sensor fibre grating and electric power transfer is close to.
2. the method that realizes fiber grating and fiber Raman composite sensing network is:
The working time of fiber Bragg grating (FBG) demodulator and fiber Raman (FBG) demodulator is controlled by photoswitch; When photoswitch was communicated with fiber Bragg grating (FBG) demodulator with sensing network, the broad band light beam by fiber Bragg grating (FBG) demodulator sends incided in the sensing network through photoswitch; Broad band light beam is by each sensor fibre grating filtering and reflection, reflected light is got back to fiber Bragg grating (FBG) demodulator by photoswitch, and fiber Bragg grating (FBG) demodulator comes the health status of key joints in the online switchyard of demodulation electric power transfer by the amount of movement that detects each sensor fibre grating feature reflection wavelength; When photoswitch was communicated with the fiber Raman (FBG) demodulator with sensing network, the pulse laser that is sent by the fiber Raman (FBG) demodulator incided in the sensing network by photoswitch; Laser is propagated along sensor fibre, and excites Raman diffused light dorsad; Raman diffused light is got back to the fiber Raman (FBG) demodulator through photoswitch dorsad; The fiber Raman (FBG) demodulator demodulates along the health status of sensor fibre length direction power transmission line diverse location according to the moment and the intensity of the Raman diffused light that receives.
CN2010101361085A 2010-03-30 2010-03-30 Fiber Bragg grating and fiber Raman composite sensing network and realizing method thereof CN101832794B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102147299A (en) * 2010-12-29 2011-08-10 大连理工大学 Fiber Raman and fiber Bragg grating collinear fusion sensing method
CN103439766A (en) * 2013-06-26 2013-12-11 江苏金迪电子科技有限公司 Spatial division multiplexing method for multi-core optical fiber
CN103776474A (en) * 2014-01-10 2014-05-07 江苏昂德光电科技有限公司 3D matrix-type multi-channel optical fiber sensing demodulation system
CN105783948A (en) * 2016-03-25 2016-07-20 北京信息科技大学 FBG sensor system based on cooperation of multiple sensing modules
CN106525280A (en) * 2016-11-25 2017-03-22 中交第公路勘察设计研究院有限公司 Distributed high precision temperature monitoring system and method in high-altitude permafrost regions
CN109374112A (en) * 2018-11-20 2019-02-22 浙江大学 Optical-fiber two-dimensional vibrating sensor and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2539146Y (en) * 2002-04-08 2003-03-05 胡浩 Optical fibre raster temp voltage sensor
US20050259697A1 (en) * 2004-05-24 2005-11-24 Korea Institute Of Science And Technology Raman or erbium-doped fiber laser using few-mode fiber grating, and long-distance remote sensor for simultaneously measuring temperature and strain by separating temperature and strain components using the same
US20090225793A1 (en) * 2008-03-10 2009-09-10 Redwood Photonics Method and apparatus for generating high power visible and near-visible laser light
CN201653435U (en) * 2010-03-30 2010-11-24 浙江大学 Fiber grating and fiber Raman composite sensor network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2539146Y (en) * 2002-04-08 2003-03-05 胡浩 Optical fibre raster temp voltage sensor
US20050259697A1 (en) * 2004-05-24 2005-11-24 Korea Institute Of Science And Technology Raman or erbium-doped fiber laser using few-mode fiber grating, and long-distance remote sensor for simultaneously measuring temperature and strain by separating temperature and strain components using the same
US20090225793A1 (en) * 2008-03-10 2009-09-10 Redwood Photonics Method and apparatus for generating high power visible and near-visible laser light
CN201653435U (en) * 2010-03-30 2010-11-24 浙江大学 Fiber grating and fiber Raman composite sensor network

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102147299A (en) * 2010-12-29 2011-08-10 大连理工大学 Fiber Raman and fiber Bragg grating collinear fusion sensing method
CN103439766A (en) * 2013-06-26 2013-12-11 江苏金迪电子科技有限公司 Spatial division multiplexing method for multi-core optical fiber
CN103439766B (en) * 2013-06-26 2016-06-29 江苏金迪电子科技有限公司 A kind of space division multiplexing method of multi-core fiber
CN103776474A (en) * 2014-01-10 2014-05-07 江苏昂德光电科技有限公司 3D matrix-type multi-channel optical fiber sensing demodulation system
CN105783948A (en) * 2016-03-25 2016-07-20 北京信息科技大学 FBG sensor system based on cooperation of multiple sensing modules
CN105783948B (en) * 2016-03-25 2018-02-06 北京信息科技大学 A kind of FBG sensor system based on the cooperation of more sensing modules
CN106525280A (en) * 2016-11-25 2017-03-22 中交第公路勘察设计研究院有限公司 Distributed high precision temperature monitoring system and method in high-altitude permafrost regions
CN109374112A (en) * 2018-11-20 2019-02-22 浙江大学 Optical-fiber two-dimensional vibrating sensor and preparation method thereof

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