Development of Stabilized and High Sensitive Optical Fi- Ber Acoustic Emission System and Its Application
نویسندگان
چکیده
We developed a novel fiber-optic acoustic emission (AE) monitoring system and applied this to gas-leak detection. The system is a Mach-Zehnder, homodyne-type optical fiber laser interferometer with a phase compensation feedback circuit. The phase compensation was given by a piezo-actuator, which can maintain the system at being quadurature condition. The system was demonstrated to measure the in-plane motion of elastic waves. The system can also detect Ao-mode Lamb waves generated by pulse YAG laser and cylindrical waves produced by lead breaking on a 2-inch steel pipe. We also detected continuous cylindrical waves from gas leakage through a hole of 0.3-mm diameter in a 4-inch steel pipe. RMS voltage of the AE signals, monitored by the sensor fiber wound around the pipe, was found to increase with gas pressure
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