Optical fiber sensor strain sensitivity calibration method based on bare optical fiber

Abstract

The invention discloses an optical fiber sensor strain sensitivity calibration method based on a bare optical fiber, belongs to the technical field of detection, and relates to the optical fiber strain sensor sensitivity calibration method based on the bare optical fiber. According to the method, an universal testing machine is used as an intermediary, when same force is loaded on a same specimen,same stress-strain is obtained, and the un-packaged bare optical fiber is used as a reference for calibrating a fiber bragg grating stress-strain sensor. In a calibration process, by operating a computer, the force loaded by a loading device every time is controlled, an optical fiber demodulation instrument is controlled to acquire measurement data, calibration data is used for being compared with the bare optical fiber, and the sensitivity of the fiber bragg grating strain sensor is obtained, so that a strain character of the fiber bragg grating sensor is accurately calibrated. The method issuitable for calibrating sensitivity coefficients of any optical fiber strain study sensors, errors caused by the problem of taking conversion from the loaded force to stretching stress, a specimen elasticity modulus range and the like into account are avoided, the calibration precision is greatly improved, moreover, operation is convenient, and the method is fast and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of detection and relates to a method for calibrating the sensitivity of an optical fiber strain sensor based on a bare optical fiber. Background technique [0002] In the field of measurement technology, fiber grating strain sensors play a very important role. Due to its performance of anti-electromagnetic and atomic radiation interference, mechanical properties of thin diameter, soft quality, and light weight; electrical properties of insulation and non-induction; chemical properties of water resistance, high temperature resistance, corrosion resistance, etc. and high sensitivity, it is compatible with optical fibers. Telemetry technology is inherently compatible and widely used in the field of measurement. The principle is that the light from the light source is sent to the modulator through the optical fiber, and after the parameter to be measured interacts with the light entering the modulation area, th...

AI Technical Summary

Problems solved by technology

Avoid the problem that the true value of stress and strain cannot be determined, and realize the accurate calibration of the strain sensitivity coefficient of the sensor

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