APPLICATION OF FIBER-OPTIC DOPPLER SENSOR TO ROCK STRUCTURES
Fiber Optic Doppler (FOD) sensor that can measure AE (Acoustic Emission) has been invented and developed. FOD sensor is made by looping an optical fiber and it is attached on an object or embedded. It measures a displacement rate (strain speed) as the frequency changes of laser light due to the Doppler Effect. FOD sensor has the following advantages; (1) small diameter and small weight, (2) long-distance transmission, (3) immunity from the electro-magnetic noise, (4) usability under high temperature, (5) wide frequency coverage to ultrasonic, (6) durability and anti-corrosive. In order to examine applicability of FOD sensor to monitoring of rock structures, the authors compared the sensitivity and the frequency response of FOD sensor to those of the conventional PZT sensor in laboratory experiments. The results indicated that FOD sensor has strong possibility to be used for real rock structures.
Yuichi Machijima Seiji Kikuyama Masahiro Tanaka Tsuyoshi Ishida
LAZOC Inc., Japan Kyoto University, Japan
国际会议
长沙
英文
888-892
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）