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A sensor assembly and optical fiber strain technology, applied in instruments, optical devices, measuring devices, etc., can solve the problem that the sensor cannot be reused again, and achieve the effect of easy installation, layout and reuse, prevention of erosion and damage, and the overall structure is simple and reliable.
Inactive Publication Date: 2015-01-14
NO 719 RES INST CHINA SHIPBUILDING IND
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[0004] In view of this, the present invention provides a split-type optical fiber strain sensor assembly, which separates the packaging protection part from the assembly base, thereby solving the problem that the sensor cannot be reused after one installation, and making the fiber grating sensor have strong environmental adaptability
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[0015] The present invention will be described in detail below with reference to the drawings and embodiments.
[0016] This embodiment provides a split fiber optic strain sensor assembly used in structural safety monitoring. The packaging guard and assembly base of the sensor assembly can be separated and disassembled, thereby facilitating the installation, deployment and reuse of the fiber grating sensor.
[0017] The split-type optical fiber strain sensor assembly includes a sensing element 2, a packaging protective part 3 and an assembly base. The sensor element 2 has a wavelength of λ B The optical fiber Bragg grating, and the package guard 3 is a steel tube. The steel pipe is formed by one-time processing, leaving only a small axial gap to allow the fiber grating to pass through to ensure its structural strength, and at the same time make it have impact and pressure resistance. After the fiber grating passes through the inner wall of the capillary steel tube, there is a tiny...
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Abstract
The invention provides a split type optic fiber strain sensor assembly. Under the premise that fiber bragg grating prestressed encapsulation is not influenced, an encapsulation mode and an assembling mode are decoupled, and the problem that a sensor cannot be used again after being mounted once is solved through separation of a metal encapsulation protection piece and an assembling base. The split type optic fiber strain sensor assembly comprises a sensing element, the encapsulation protection piece and the assembling base. The sensing element is a fiber bragg grating, and the encapsulation protection piece is a metal tube. After the fiber bragg grating penetrates through the mental tube, the clearance between the fiber bragg grating and the metal tube is welded and fastened in an ultrasonic welding mode. Optical fibers are led out from the two ends of the metal tube. The two ends of the metal tube are banded tightly through flange plates. The metal tube with the encapsulated sensing element is supported by the assembling base, and the flange plates at the two ends of the metal tube are connected with the assembling base.
Description
Technical field [0001] The invention relates to a sensor assembly, in particular to a split optical fiber strain sensor assembly, belonging to the technical field of optical fiber grating measurement sensing. Background technique [0002] Fiber gratings are widely used in vibration, displacement, acceleration, temperature, strain, etc. because of their high sensitivity, strong anti-interference ability, good environmental adaptability, small size, long-distance transmission, and easy distributed multi-point network measurement. Sensor measurement field. In the field of structural safety monitoring, fiber grating strain sensors are mainly used to monitor and evaluate the safety of buildings, such as airports, stadiums, bridges, tunnels, etc., to measure changes in mechanical parameters such as displacement, strain, and vibration, and then save historical data regularly. Set the alarm threshold of the measuring point, etc. The basic principle is to use the fiber Bragg grating to ...
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