Project Title:

Fiber-Optic-Based Hydrogen Monitor

92-1-13.04-7831                                                   NAS10-11985
Fiber-Optic-Based Hydrogen Monitor
Research International, Inc.
18706 142nd Avenue, NE
Woodinville, WA  98072
Elric W. Saaski                                      (206-486-7831)

Abstract:

     The development of a portable hydrogen monitoring system is
the goal of this project. The approach will be based on
interferometric optical principles. The hydrogen detecting element
is a thin, sub-micron, multilayer film that changes spectral
properties in direct response to changes in hydrogen
concentration. The film assembly is deposited on a transparent
substrate that can be remotely interrogated over large distances
via fiber-optic cable, thereby ensuring safe measurements in
explosive atmospheres. Small cross-section probes and sensor tips
can be built for pin-point leak detection. This project will
develop an all solid-state electronics package that interrogates
the sensor with multiple wavelengths derived from long-lived LEDs
while providing output data via an LCD readout and digital data
link. The optoelectronics is designed so that the base unit can be
used as a hand-held survey instrument or a remote readout. Phase I
will focus on developing and testing prototype sensors to
specifications typical of those needed for detecting hydrogen
leaks during prelaunch hydrogen loading of space vehicles.

Potential Commercial Application:

Potential Commercial Applications:  Hydrogen is an offgassing
product of electrical equipment that is suffering a dielectric
breakdown. The device's most important application would be to
monitor large power transformers for unusual levels of offgassing
that could indicate an imminent failure and/or explosion. Hydrogen
is also used in processes such as ammonia manufacture and
hydrogenation.

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