| Summary: | 碩士 === 元智大學 === 機械工程學系 === 98 === Fiber-optic sensors with small size, light weight, low attenuation and immunity to the electro-magnetic have the advantages over the conventional sensor, had been widely used in communication and sensing technology. In this investigation, the Fiber Bragg Grating (FBG) is incorporated with the specific reflected wavelength to measure the response of strain and the variation of temperature in the vibrational structure. As the linear part of the broadband light sources, the intensity of the light is modulated by the wavelength reflected from the FBG. By measuring the intensity of the light, the wavelength reflected from the fiber bragg grating sensor can be determined, thus, leads to the determination of the strain and temperature in the structures. In this investigation, the fiber bragg grating sensor is attached to the cantilever beam, the experimental tests presented in this research including free vibration (Change the amplitudes and frequency) and temperature change tests. The response of strain and variation of temperature which measured by the Fiber Bragg Grating sensor will be compared with the response of strain and variation of temperature which measured by the strain gauge and the thermocouple. The capability of FBG sensor in measuring the response of strain and the variation of temperature in the vibrational structures is as good as the strain gauge and the thermocouple.
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