Fiber bragg grating acceleration transducer based on fabrication structure
An acceleration sensor, fiber grating technology, which is applied in the direction of acceleration measurement using inertial force, cladding fiber, optical waveguide light guide, etc., can solve the problems of high price, low sensitivity, inability to perform intensity demodulation, etc., and achieve low production cost. , high sensitivity, compact structure
Inactive Publication Date: 2011-06-15
湖南光蓝科技发展有限公司
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[0005] The purpose of the present invention is to address the shortcomings of the existing fiber grating acceleration sensors, which are expensive, low in sensitivity, and unable to perform intensity demodulation, and propose a tapered structure based on simple design, compact structure, high sensitivity, and low cost. Fiber Bragg Grating Acceleration Sensor
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[0014] The present invention will be further described below in conjunction with the accompanying drawings.
[0015] Such as figure 1 , as shown in 2, a FBG acceleration sensor based on a tapered structure mainly includes a broadband light source 1, a photodetector 2, a fiber coupler 3, a fixing device 4, a single-mode fiber taper region 5 and a fiber Bragg grating 6. The broadband light source 1 is connected to one end of the 1×2 fiber coupler 3, the other end of the fiber coupler 3 is connected to one end of the single-mode fiber taper 5, the other end of the fiber coupler 3 is connected to the photodetector 2, and passes through the fiber taper The other end of the zone 5 is connected to a fiber grating 6 . Use the fixing device 4 to fix the end of the fiber taper 5 close to the coupler 3, and fix a certain mass of weight 7 at the free end of the fiber as required to make the fiber taper 5 produce a certain initial bending.
[0016] The fiber beam waist of the taper part ...
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The invention relates to a fiber bragg grating acceleration transducer based on a fabrication structure, and the fiber bragg grating acceleration transducer is used for measuring acceleration by a strength demodulation method and solving the problems of complex structure and high price of the general optical fiber sensor by means of the compact structure. In the fiber bragg grating acceleration transducer, light successively enters an optical fiber cone zone and a fiber bragg grating, and reflected light is detected by a photoelectric detector after passing through the cone zone and a coupler. The loss of the optical fiber cone zone is changed along with the bending degree of the optical fiber cone zone. When the acceleration acts on the sensor, the bending of the cone zone is changed because of being influenced by the acceleration, and power detected by the photoelectric detector is changed along with the acceleration. The information of the acceleration can be demodulated from the output of the photoelectric detector. The fiber bragg grating acceleration transducer has the advantages of small volume, simple structure, low price and strong maneuverability, and can be widely applied to various acceleration monitoring fields.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber grating acceleration sensor based on a tapered structure. Background technique [0002] Compared with traditional electrical sensors, fiber optic sensors have unique advantages: high sensitivity, light weight, small size, anti-electromagnetic interference, corrosion resistance, and intrinsically safe. Since the optical fiber sensor uses light waves to transmit information, and the optical fiber can be used as an electrical insulation and corrosion-resistant transmission medium, it can be conveniently and effectively used in various large-scale electromechanical, seismic wave detection, petrochemical, mine and other strong electromagnetic interference and easy-to-use sensors. Inflammable and explosive and other harsh environments. [0003] The mechanism of using optical fiber as the acceleration measurement medium is various, and the acc...
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IPC IPC(8): G01P15/03G02B6/02
Inventor 董新永李岚赵春柳倪凯
Owner 湖南光蓝科技发展有限公司