Polymer Encapsulated Grating Sensor and Correction Method for Viscoelastic Effect of Sensor

Abstract

The invention discloses a polymer packaged grating sensor and belongs to the field of sensors. The polymer packaged grating sensor comprises a deformation member, a test member and a grating demodulation system, wherein the deformation member comprises a left fixed end, a large deformation unit, a grating package unit and a right fixed end; the test component comprises a grating package unit, a strain test grating and a temperature test grating; and the grating demodulation system comprises an integrated grating demodulator and an optical fiber. The polymer packaged grating sensor of the invention combines a large deformation unit with large deformation capability, which can satisfy accurate measurement of large displacement. The invention also discloses a correction method for sensor viscoelastic effect. The method corrects the viscoelastic effect error in the sensor test process by means of a uniaxial tensile test and the convolution algorithm. The viscoelastic effect correction method of the invention can meet the correction requirement of the viscoelastic effect error in the polymer packaged grating sensor and the general sensor test process, and improve the sensor test accuracy and measurement range.

Description

technical field [0001] The invention relates to the field of sensors, in particular to polymer-encapsulated optical fiber grating sensors, in particular to polymer-encapsulated grating sensors and a correction method for the viscoelastic effect of general sensors. Background technique [0002] Fiber Bragg grating sensor is a new type of optical fiber sensor, which has the advantages of high sensitivity, anti-electromagnetic interference, small size, light weight, etc., and has broad application prospects in strain measurement and temperature measurement. At present, fiber grating sensors have been widely used in aerospace, civil engineering, transportation and other fields. However, the fiber grating sensor is limited by its material properties, and has defects such as small elastic deformation limit (1-3%), brittleness, and poor toughness, so that the fiber grating sensor can neither measure large extension deformation nor withstand harsh conditions. test environment. [...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the shortcomings of limited elastic elongation and low fracture toughness of the sensor in the prior art, and discloses a polymer-encapsulated grating sensor. The sensor of the present invention is provided with a large deformation unit with large deformation capacity and can withstand large elongation ; The present invention also discloses a correction method for the viscoelastic effect of a general sensor, which meets the accuracy requirements of the large displacement measurement of the sensor

Images