Abstract
In some applications in structural health monitoring (SHM), the acoustic emission (AE) detection technology is used in the high temperature environment. In this paper, a high-temperature-resistant AE sensing system is developed based on the fiber Bragg grating (FBG) sensor. A novel high temperature FBG AE sensor is designed with a high signal-to-noise ratio (SNR) compared with the traditional FBG AE sensor. The output responses of the designed sensors with different sensing fiber lengths also are investigated both theoretically and experimentally. Excellent AE detection results are obtained using the proposed FBG AE sensing system over a temperature range from 25 ℃ to 200 ℃. The experimental results indicate that this FBG AE sensing system can well meet the application requirement in AE detecting areas at high temperature.
Highlights
When the monitored materials are undergoing deformation, the internal cracks may generate and further extend, which will severely endanger the safety and reliability of the monitored structure
Dandan PANG et al.: Development of High Temperature Acoustic Emission Sensing System Using Fiber Bragg Grating the installation and shape of buffer rods directly affected the reliability of the test results
After the experiment of comparison between the novel and traditional fiber Bragg grating (FBG) acoustic emission (AE) sensors, we investigate the relationship between the response characteristics and the sensing length L of the novel FBG AE sensor
Summary
When the monitored materials are undergoing deformation, the internal cracks may generate and further extend, which will severely endanger the safety and reliability of the monitored structure. The acoustic emission (AE) monitoring technology is an excellent means for structural health monitoring (SHM) [1,2,3]. In the situation of some SHM areas, the AE monitoring technique is required under the high temperature condition. Dandan PANG et al.: Development of High Temperature Acoustic Emission Sensing System Using Fiber Bragg Grating the installation and shape of buffer rods directly affected the reliability of the test results. We design an AE sensing system for the high temperature environment using the fiber Bragg grating (FBG) as the sensing element. A high temperature AE detecting experiment is performed using the designed high-temperature-resistant AE sensing system over a temperature range from the ambient temperature to 200 °C
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