Sapphire fiber grating metal casting anti-scouring high-temperature strain sensor

Abstract

The invention discloses a sapphire fiber grating metal cast anti-scouring high-temperature strain sensor, which comprises a tail fiber, and a sleeve is sleeved outside the tail fiber; the sleeve is fixedly connected with two ends of the tail fiber through high-temperature glue; one end of the tail fiber is welded with one end of a sapphire fiber, and the other end of the sapphire fiber is ground into an oblique angle; a first grating and a second grating are inscribed in the sapphire optical fiber; the second grating is sleeved and fixedly connected with a protective sleeve; and casting metal is sleeved and fixedly connected outside the sapphire optical fiber. According to the invention, the structure is reasonable, single-mode system transmission can be realized, high-order modes can be effectively filtered out, 3dB bandwidth can be reduced, and measurement precision can be improved; the problems of instability, low measurement precision and the like of a multi-mode system are avoided; meanwhile, the strain measurement problem in a high-temperature state can be solved, the anti-scouring capability of the sensor can be effectively improved by adopting a metal pouring technology, and the high-temperature strain measurement application in complex scouring force thermal environments such as the interior of an engine and a rocket tail nozzle is met.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a sapphire optical fiber grating metal casting scour-resistant high-temperature strain sensor. Background technique [0002] Temperature and strain sensors have a wide range of application values ​​in national defense industry, material chemical industry, building health monitoring and security maintenance. With the development of aerospace technology, high-tech material smelting, national defense industry and other fields, temperature strain sensors have proposed new technologies such as higher temperature tolerance, anti-electromagnetic interference, anti-scouring, anti-corrosion, high sensitivity, miniaturization, and long service life. requirements. Most of the existing commercial temperature sensors are contact electrical sensors based on thermal electromotive force and thermal resistance, and non-contact sensors based on the principle of thermal imaging, whil...

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