| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 98 === In this thesis, the symmetrically stacked long period fiber grating (SLPFG) is fabricated with SU-8 photoresist by etching and lithography process. The experimental results of the temperature-insensitive force sensing system show the average linearity of the force calibration is about 0.9957, and the average temperature sensitivity is about 0.0844/℃, the temperature insensitivity has been improved 32%. The ratio of the resonant wavelength shift and grating period increasing is about 16.5nm/10μm. When the grating length increase with 5mm, the resonance attenuation will be intensified about -5.05dB. When the width of photoresist increase, the resonance wavelength will be red-shit at the rate (-2.16nm/0.5mm). When the fiber cladding thickness increase, the rate of the resonance wavelength shift is about -9.90nm/2μm. For temperature characterization of the SLPFG, the resonance wavelength of the SLPFG will gradually disappear when temperature is raising above glass transition temperature of the SU-8 photoresist (55℃). In Hydrolysis experiment, the resonance wavelength will disappeared when SLPFG is immersed in the water.
The electroforming long period fiber grating is fabricated with nickel by electroforming process. In the thermal cycle experiment, the resonance attenuation will begin to produce during the cooling process with the axial force of 0.3N and 0.6N. In the three-point bending experiment, the strain sensitivity is -0.0035dB/με. For four-point bending experiment, the strain sensitivity is -0.0064dB/με.
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