抄録
We have developed fiber optic strain and vibration sensors (FOSVS) suited for simultaneous monitoring of strain and vibration. A fiber optic gap sensor made of two optical fibers, a broad-band light source, two photo detectors and an FBG filter were used to compose the sensor system. The gap sensor was composed of two fibers. One of them fixed like a cantilever beam. The axial displacement of the sensor was measured from the reflected interfered signal. The amplitude of the transmitted signal through the reflector fiber was used to measure the transverse vibration of the cantilever fiber. The sensor was applied to measurement of quasi-static tensile strain, vibration under tensile strain and bending vibration. From the experimental and theoretical results, it appeared that the FOSVS could measure the axial strain and the transverse acceleration correctly. Furthermore, from bending vibration test, it was found that FOSVS could measure strain and vibration simultaneously.
