光纤传感器对煤岩体声发射的检测

Fiber-optic sensor test of acoustic emission for coal rock

为实时掌握煤岩体安全状况,将光纤Sagnac传感器应用于煤岩体的声发射检测。当煤岩体因外力或内部缺陷产生的声发射信号被光纤传感器检测到,光纤传感器输出端的输出光强便发生变化;通过对输出光强进行监测,并经傅立叶变换后得到声发射信号的频率特征。对整个系统进行计算机仿真,结果表明,该系统适用于煤岩体声发射信号的特征识别。

This paper is an effort to realize the real time control of coal and rock security using the optical fiber sensor to test acoustic emission of coal and rock. The optical fiber sensor＇ s detection of acoustic emission signal arising from external or internal defects tends to give rise to changes in output light intensity of output terminal. The frequency characteristics of AE signal is obtained by detecting the output optical intensity and using Fourier transform technique. The computer simulation of the system shows that the system is capable of identifying the AE frequency characteristics in the coal rock transmission.