High-temperature-resistant flexible long-gauge strain sensor and manufacturing method and application thereof

Abstract

The invention discloses a high-temperature-resistant long-gauge flexible strain sensor capable of being used for strain monitoring of high-temperature facilities. Fiber bragg grating sensing is adopted as a sensing technology, and a high-temperature-resistant packaging process is utilized to realize strain monitoring under high temperature conditions. The high-temperature-resistant long-gauge flexible strain sensor comprises a fiber bragg grating and a packaging sheath, wherein the fiber bragg grating is fixed into the packaging sheath through anchoring areas at the two ends, and a grating area is positioned between the two anchoring areas. When the high-temperature-resistant long-gauge flexible strain sensors are arranged on the surfaces of the high-temperature facilities in a distributedmode, the strain monitored by the grating areas can reflect a certain range of strain of a structure. The high-temperature-resistant long-gauge flexible strain sensor is simple in sensing structure and low in cost and can be connected in series in a large number, the problem of high-temperature strain / stress monitoring of the high-temperature facilities (planes or curved surfaces) is solved, themarket competitiveness is high, and beneficial effects are generated on ensuring the safety of national infrastructures.

Description

technical field [0001] The invention belongs to the technical fields of engineering structure maintenance / monitoring and sensing, and specifically relates to a high-temperature-resistant flexible long-gauge strain sensor based on fiber grating sensing technology that can be used for strain monitoring of high-temperature facilities. Background technique [0002] High-temperature and high-pressure vessels are important infrastructure in the chemical industry, as well as important reaction vessels and storage vessels in the chemical industry. According to statistics from the State Administration for Market Regulation in 2017, my country currently has 3,819,600 pressure vessels of various types, a considerable proportion of which are high-temperature and high-pressure vessels (the design temperature is generally above 300°C). The safety of pressure vessels has always been a hot spot of social concern, because once an accident occurs, it is often accompanied by heavy property los...

AI Technical Summary

Problems solved by technology

The light propagation structure inside the optical fiber is made of quartz glass, which can generally withstand temperatures above 1000°C, but the protective layer around the optical fiber glass structure is a resin layer, which cannot withstand high temperatures

Images