A hydrogen gas detector for detection of hydrogen gas in a gaseous environment.
The detector comprises a light/heat source, an optical detector, and an optical
barrier between the source and detector. The optical barrier responds to the presence
of hydrogen by responsively changing from a first optical state to a different
second optical state, whereby transmission of light from the light/heat source
through the optical barrier is altered by the presence of hydrogen and the altered
transmission is sensed by the optical detector to provide an indication of the
presence of hydrogen gas in the gaseous environment.
