Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Tao, Shiquan

Committee Member

Wang, Chuji

Committee Member

Fu Su, Chun

Committee Member

Monts, David L

Date of Degree

8-11-2007

Document Type

Graduate Thesis - Open Access

Major

Physics

Degree Name

Master of Science

College

College of Arts and Sciences

Department

Department of Physics and Astronomy

Abstract

An active core fiber optic gas sensing technique has been developed by using a photonic crystal (PC) hollow core fiber (HCF) as a transducer and a tunable diode laser as a light source for multi-gas sensing. The intrinsic optical absorption signal of an analyte molecule in the near nfrared region is monitored for sensing C2H2,CO2 and NH3. Although the overtone absorptions are known to have low absorption cross-sections, this sensor can detect these gas components down to the parts-per-million (ppm) level by using a 1-meter hollow core fiber as a transducer. This sensor is an example of application of PC-HCF to gas sensor design. The sensitivity of this gas sensing technique can be improved by introducing periodic openings along the fiber, decreasing the hole diameter down to 0.5 mm and using a longer hollow optical fibers. Other advantages of this gas sensing technique include less interference, fast response and potential applications like high temperature, remote and corrosive gas sensing.

Temporal Coverage

2000-2009

URI

https://hdl.handle.net/11668/14892

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