SENSOR FOR PROBING GEOLOGICAL DISASTER AND MONITORING AND ALARMING DEVICE THEREOF

摘要

A sensor for probing a geological disaster and a monitoring and alarming device thereof comprise three fixed plates (1, 2, 3). Each fixed plate is provided with a through hole in the middle. A vibration diaphragm (8) is mounted between the first fixed plate (1) and the second fixed plate (2). A first permanent magnet (9) is disposed on an upper surface of the vibration diaphragm (8). A second permanent magnet (10) is disposed on a lower surface of the vibration diaphragm (8). A vibration beam (11) and an optical fiber (12) are mounted between the second fixed plate (2) and the third fixed plate (3). A third permanent magnet (14) is disposed on an upper surface of the vibration beam (11) located at the through hole. An optical fiber grating (13) is mounted on the optical fiber (12) located at the through hole. A fourth permanent magnet (15) is disposed on the optical fiber grating (13). The third permanent magnet (14) and the fourth permanent magnet (15) are located in the same vertical plane. Adjacent magnetic poles of the second permanent magnet (10) and the third permanent magnet (14) are the same in magnetism. The device can probe three physical quantities of geological changes at the same time: micro-vibration, electro-magnetic induction, and acoustic emission change, thereby improving the forecast accuracy and improving the anti-interference capability.