Distributed coaxial cable strain sensor based on cavity reflection and its manufacturing method

Abstract

The invention discloses a cavity reflection-based distributed coaxial cable strain sensor. The cavity reflection-based distributed coaxial cable strain sensor comprises a shell, a metal cavity body, stepped metal cover plates, coaxial cables, copper tuning screws and waterproof terminals; the metal cavity body is arranged vertically in a middle position inside the shell; the stepped metal cover plates are arranged at the upper end and lower end of the metal cavity body to enclose the metal cavity body; the copper tuning screws are screwed into screw holes in the stepped metal cover plates; the coaxial cables are arranged at the left end and right end of the shell through the waterproof terminals and extend into the metal cavity body; the two coaxial cables are located at the same horizontal line and are connected through adopting a welding process; and the welding points of the coaxial cables are located at the center of the metal cavity body. The cavity reflection-based distributed coaxial cable strain sensor fabricated by using the fabrication method of the invention has the advantages of strong anti-interference ability, good shielding performance, stable transmission data, high sensitivity, strong distinguishing ability, high applicability and high stability.

Description

technical field [0001] The invention relates to various coaxial cable strain sensors, in particular to a distributed coaxial cable strain sensor based on cavity reflection and a manufacturing method thereof. Background technique [0002] At present, sensors are playing an increasingly important role in people's lives, such as MEMS sensors that are widely used in electronic products such as acceleration sensors in automobiles and mobile phones; similarly, in large-scale road projects, bridges and long-distance transmission In oil and gas pipeline engineering, the stress / strain sensors used to monitor the deformation of objects have also been widely used. The monitoring and early warning of geological disasters and structural health monitoring have gradually been valued by professional engineers. However, its monitoring equipment and technology are basically local monitoring, that is to say, quasi-distributed monitoring, such as resistance strain gauges, vibrating wire sensing...

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Problems solved by technology

However, its monitoring equipment and technology are basically local monitoring, that is to say, quasi-distributed monitoring, such as resistance strain gauges, vibrating wire sensing elements, optical fiber sensors, etc. The monitoring range of these quasi-distributed sensors is too small. It is easy to be damaged, so it loses the monitoring ability before the measured object is damaged, and cannot meet the whole process of structural damage monitoring under extreme environments and disasters, nor can it monitor the entire measured object in all directions; therefore, for the safety of major engineering structures Sensors with large range, large gauge distance, and distributed monitoring mode are urgently needed for monitoring

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