Design of Fiber Grating Measurement System and Dynamical Sensor
碩士 === 國立中正大學 === 機械工程所 === 94 === A fiber-optic measurement system which includes a FBG sensor and a Mach-Zehnder interferometer is developed. A FBG of which center wavelength can be modulated by strain due to photo-elastic effect is utilized as a vibration sensor. A Mach-Zehnder interferometer whi...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/65031778807946366440 |
| Summary: | 碩士 === 國立中正大學 === 機械工程所 === 94 === A fiber-optic measurement system which includes a FBG sensor and a Mach-Zehnder interferometer is developed. A FBG of which center wavelength can be modulated by strain due to photo-elastic effect is utilized as a vibration sensor. A Mach-Zehnder interferometer which includes an ASE light source, two fiber couplers, a photo detector and a PZT actuator is integrated to measure the phase difference induced by this FBG sensor. Two different methods are used in demodulating the measured signal. The first one used a PZT actuator to demodulate the vibration signal to avoid the signal fading. The second one used a 3×3 directional coupler. The performance of the FBG sensor is investigated as compared to a traditional accelerometer. Experimental results show that the interferometer can accurately acquire the vibration signal from the FBG sensor. However the sensitivity of this FBG sensor still needs improvements.
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