Title page for ETD etd-10252004-172411

Type of Document Master's Thesis
Author Wang, Xingwei
Author's Email Address xiwang@vt.edu
URN etd-10252004-172411
Title Optical Fiber Tip Pressure Sensor
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wang, Anbo Committee Chair
Liu, Yilu Committee Member
Pickrell, Gary R. Committee Member
  • miniature
  • optical fiber tip pressure sensor
  • Fabry-Perot interferometry
Date of Defense 2004-10-18
Availability unrestricted

Miniature pressure sensors which can endure harsh environments are a highly sought after goal in industrial, medical and research fields. Microelectromechanical systems (MEMS) are the current methods to fabricate such small sensors. However, they suffer from low sensitivity and poor mechanical properties.

To fulfill the need for robust and reliable miniature pressure sensors that can operate under high temperatures, a novel type of optical fiber tip sensor only 125μm in diameter is presented in this thesis. The essential element is a piece of hollow fiber which connects the fiber end and a diaphragm to form a Fabry-Pérot cavity. The all-fused-silica structure fabricated directly on a fiber tip has little temperature dependence and can function very well with high resolution and accuracy at temperatures up to 600C. In addition to its miniature size, its advantages include superior mechanical properties, biocompatibility, immunity to electromagnetic interference, disposability and cost-effective fabrication.

The principle of operation, design analysis, fabrication implementation and performance evaluation of the sensor are discussed in detail in the following chapters.

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