摘要
针对岩石破裂声发射检测中的常规检测仪器抗电磁干扰差、灵敏度低、可靠性差等不足,提出采用光纤光栅传感技术来实现声发射检测,分析了光纤光栅传感检测应变和声发射的机理,组建了相应的声发射检测模拟实验系统,给出了模拟实验的500kHz激励声信号和光纤光栅传感响应信号。利用软件RFPA进行了岩石破裂的数值模拟,选择水泥河砂作为主要原料的砂浆材料,制作了类岩石材料实验试件,并在单轴数控压力机上进行了岩石试件加载破裂声发射实验,用光纤光栅传感器来探测和记录声发射能量及声发射累计次数,证明该传感器能实现声发射检测。
Due to the fact that electromagnetism ultrasonic detection implements have some disadvantages of poor interference immunity,low sensitivity and inferior reliability,acoustic emission detection based on fiber Bragg grating (FBG) sensor is hence put forward to monitor rocks.The strain and ultrasonic detection principles of FBG sensors are analyzed,at the same time,experimental system based on FBG ultrasonic sensor detection is also set up to simulate ultrasonic detection.The testing results of 500 kHz acousti...
出处
《无损检测》
北大核心
2008年第10期734-737,749,共5页
Nondestructive Testing
基金
国家自然基金仪器专项资助项目(50727904)
教育部博士点基金资助项目(20070422105)
山东省自然科学基金资助项目(Q2007F06)
关键词
声发射检测
岩石破裂
光纤光栅
数值模拟
Acoustic emission testing
Rock failure
Fiber optical grating
Numerical simulation
