▎ 摘　　要

NOVELTY - Flexible tensile strain sensor comprises first flexible polymer layer, sensitive layer and second flexible polymer layer; where sensitive layer is the conductive film prepared by the raw material including the conductive material. The sensitive layer is interdigital electrode structure. The preparation method of the sensitive layer involves (a) depositing or dropping the dispersion liquid containing the conductive material on the substrate to form a uniform seepage network conductive film; (b) using a laser marking system on the seepage network conductive film etching pattern, forming a staggered electrode; (c) using laser micro-processing technique to obtain the microwire containing conductive material with width of 10-500 microns; the distance between two adjacent micro-wires is 10-500 microns; so as to obtain the sensitive layer on the substrate. USE - Flexible tensile strain sensor used in the health monitoring of the submarine oil gas pipeline (claimed) and marine pipeline monitoring technology field. ADVANTAGE - The flexible tensile strain sensor optimizes the interdigital structure parameter, realizes the simple structure, improves sensitivity and eliminates cross sensitivity of the external pressure, the provided flexible tensile strain sensor has excellent sensitivity, linearity, tensile cycle performance and reliability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of flexible tensile strain sensor, which involves (i) preparing a sensitive layer on a substrate; (ii) pouring the first flexible polymer solution on the sensitive layer on the substrate, performing heat treatment at 60-80 ℃ to obtain the first flexible polymer layer; and (iii) adhering plastic plate on the first flexible polymer layer, stripping the substrate on the sensitive layer, and pouring the second flexible polymer solution on the sensitive layer, performing heat treatment at 60-80 ℃ to obtain the second flexible polymer layer, peeling off the plastic plate to obtain the flexible tensile strain sensor.