DESIGN AND PERFORMANCE TESTS OF A FBG-BASED ACCELEROMETER FOR STRUCTURAL VIBRATION MONITORING

摘要

In this paper, a FBG-based acceleration sensing technique is proposed to measure the low frequency response of the engineering structural systems. In the design stage, a special L- shaped structure is adopted to amplify the vibration response and to ward off the chirped phenomenon. Moreover, some damping liquid is infused into the sensor to broaden the working frequency range. A series of shaking table tests were then conducted to verify the performance of the prototype accelerometers. During the performance tests, the damping liquid with various viscosities is infused into the sensors, and their influences on the sensitivity, linearity and the amplitude-frequency relationship are discussed. The tests verified that the accelerometer fabricated according to this design idea own excellent performance for the structural vibration response measurement.