Type of Document Master's Thesis Author Chen, Xiaopei URN etd-05142003-213736 Title Fiber Optic Pressure Sensor Fabrication Using MEMS Technology Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Wang, Anbo Committee Chair Jacobs, Ira Committee Member Safaai-Jazi, Ahmad Committee Member Keywords
- wet etch
- Fabry-Perot interferometry
- fiber optic pressure sensor
Date of Defense 2003-05-08 Availability unrestricted Abstract(Abstract)
A technology for fabricating fiber optic pressure sensors is described. This technology is based on intermediate-layer bonding of a fused silica ferrule to a patterned, micro-machined fused silica diaphragm, providing low temperature fabrication of optical pressure sensor heads that can operate at high temperature. Fused silica ferrules and fused silica diaphragms are chosen to reduce the temperature dependence. The fused silica diaphragms have been micro-machined using wet chemical etching in order to form extrinsic Fabry-Perot (FP) interferometric cavities. Sol-gel is used as an intermediate-layer for both fiber-ferrule bonding and ferrule-diaphragm bonding at relatively low temperature (250 °C). The pressure sensors fabricated in the manner can operate at temperatures as high as 600 °C.
The self-calibrated interferometric-intensity-based (SCIIB) technology, which combines fiber interferometry and intensity-based sensing method into a single sensor system, is used to test and monitor the pressure sensor signal. The light returned from the FP cavity is split into two channels. One channel with longer coherence length can test the effective interference generated by the FP cavity, while the other channel with shorter coherence length can get signal proportional only to the source power, fiber attenuation, and other optical losses. The ratio of the signals from the two channels can compensate for all unwanted factors, including source power variations and fiber bending losses. 
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28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access Abstract.pdf 7.24 Kb 00:00:02 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 Acknowlegements.pdf 4.01 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 Chapter1.pdf 82.03 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01 Chapter2.pdf 156.87 Kb 00:00:43 00:00:22 00:00:19 00:00:09 < 00:00:01 chapter3.pdf 844.56 Kb 00:03:54 00:02:00 00:01:45 00:00:52 00:00:04 Chapter4.pdf 169.60 Kb 00:00:47 00:00:24 00:00:21 00:00:10 < 00:00:01 Chapter5.pdf 23.49 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01 Reference.pdf 30.88 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01 Title.pdf 5.43 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 TOC.pdf 27.33 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01 Vita.pdf 15.27 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01
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