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Title page for etd-0827104-120745


URN etd-0827104-120745 Statistics This thesis had been viewed 2519 times. Download 12 times.
Author Bo-Yu Su
Author's Email Address No Public.
Department Electro-Optical Engineering
Year 2003 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 82
Title A Long Period Fiber Grating Sensor for Micro-Vibration Measurement in Ultrasonic Frequency Region
Keyword
  • Long Period Fiber Grating Sensor
  • Long Period Fiber Grating Sensor
  • Abstract A long period fiber grating sensor (LPFGS) is being investigated for the micro-vibration measurement in the ultrasonic frequency, based on the side-polished single-mode fiber with a deep groove grating structure on the polished surface. Several commercial piezoelectric ceramics, quartz oscillation plats and SAW device are used in the measurement as the micro-vibration sources, with the driving frequencies from the audio to the ultrasonic region and the driving voltage from 5 to 10 volts. We have measured the change of the radiation losses of the propagating mode within the grating region as the sensing signal. For increasing the sensitivity of the sensor, the rectangular groove structure of the long period grating is fabricated by the ICP-RIE technique to etch the grating deeply enough into the core region and to keep the sidewall of the groove being etched vertically. The results show that the maximum sensible frequency is up to 50 MHz for SAW device.
    Advisor Committee
  • Woo-Hu Tsai - advisor
  • none - co-chair
  • none - co-chair
  • Files indicate in-campus access only
    Date of Defense 2004-07-30 Date of Submission 2004-08-27


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