High-temperature acoustic emission detection based on a regenerated phase-shifted FBG sensor

摘要

Aging problems of heat-resistant structures in civil infrastructure, such as thermal and nuclear power plants, have received considerable attention. The non-destructive testing (NDT) techniques, such as visual inspection, eddy current testing, and ultrasonic testing, are applied to evaluate the reliability and integrity of the structures. However, such NDT techniques require the structures to be shut down and cooled to room temperature, thus causing a long-term downtime to finish the testing. Therefore, structural health monitoring (SHM) techniques are desirable to monitor the heat-resistant structures in high-temperature environments in order to reduce the downtime and the maintenance cost.