Metallized fiber grating stress sensor suitable for cold-rolled sheet shape detection

Abstract

The invention discloses a metalized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection, and relates to the technical field of optical fibers and optical devices and the field of metal cold-rolling processing equipment. The sensor comprises a cylindrical base with an upward opening, an elastic metal disc arranged at the opening of the cylindrical base and fixedly connected with the opening of the cylindrical base, and a pressure contact cap fixedly connected to the upper surface of the elastic metal disc and provided with a downward opening, a metalized fiber bragg grating which is fixedly connected in a space enclosed by the cylindrical base, the elastic metal disc and the pressure contact cap; the metalized fiber bragg grating extends upwards from the interior of the cylindrical base, penetrates through the thickness of the elastic metal disc, enters the interior of the pressure contact cap, extends downwards, penetrates through the thickness of the elastic metal disc and returns to the interior of the cylindrical base. The sensor is simple in processing technology, low in cost and stable in work, the phenomenon that the sensitivity of the sensor is reduced due to stress transmission loss is reduced, and the application range of equipment is expanded.

Description

technical field [0001] The invention relates to the technical field of optical fiber and optical devices and the field of metal cold-rolling processing equipment, in particular to a metallized optical fiber grating stress sensor suitable for cold-rolled plate shape detection, which belongs to a kind of optical fiber grating stress sensor. Background technique [0002] Metal cold-rolled strip shape detection equipment, as the necessary basic equipment in the field of metal rolling processing, is of great significance for ensuring the quality of sheet rolling and improving the production efficiency of strip processing. The stress sensors widely used in existing flatness detectors are typically represented by electronic or mechanical sensors, which have many problems in terms of measurement accuracy, measurement speed, process structure, and anti-interference. [0003] Fiber Bragg grating sensing technology is an important branch of the field of optical fiber sensing. Because o...

AI Technical Summary

Problems solved by technology

The traditional preparation method of the stress sensor, which sticks the fiber grating on the surface of the elastic metal cylinder, needs to pass through a large area of ​​stress before it can be finally detected by the demodulation device. The load is large but the displacement is small, and the stress sensitivity of the prepared sensor is not enough. High, the scope of application is greatly limited

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