Data and Time |
December 12, 2008, 3:15-4:15 PM |
Location |
Bahen Center for Information Technology (BA), Room 1190 |
Host |
Alex Wong |
An Integrated Optic Hydrogen Sensor
Muhammed Alam
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering (Photonics)
Abstract:
Hydrogen is used as the main propellant for space shuttles, as an
energy source in fuel cells, in oil refineries, and for many other
applications. Hydrogen is extremely volatile, easily flammable, and
highly explosive. Storage and handling of hydrogen is a challenging
task and a good hydrogen sensor is highly desirable. An ideal hydrogen
sensor should be fast, reversible, highly selective, compact in size,
easy to fabricate, and cheap in price. Unfortunately such a sensor to
date is not available. We have proposed a multi-channel integrated
optical sensor for detection of hydrogen. The sensor consists of a
high index waveguide on a low index substrate and uses Pd or Pd alloy
thin film as the sensing medium. Since a single channel hydrogen
sensor will be affected by the presence of other gases and the
variations of temperature, humidity, and input power; a multi-channel
sensing scheme and differential measurements are proposed to correct
for some of these effects. All the components of the multi-channel
sensor can be realized using planar technology and the complete sensor
can be fabricated on a single chip. The sensor is compact and the
response time is expected to be very short. The concept of
multi-channel sensing presented in this work is very general and can
be extended to other gas sensors as well.
Biography:
Muhammad Alam obtained his B. Sc. Engg. degree from Bangladesh
University of Engineering and Technology in 2000 and his M. A. Sc.
degree from University of Victoria in 2004. He is currently a Ph. D.
candidate in Photonics Group. His research interests include optical
sensors and plasmonics.
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