Device and method for differential sensing of hydrogen gas...

Details Device and method for differential sensing of hydrogen gas... Device and method for differential sensing of hydrogen gas...

2006-10-03

2006-10-03

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C073S031060, C422S083000, C422S088000, C250S227270

Reexamination Certificate

active

07116421

ABSTRACT:
A hydrogen sensor, useful for trace hydrogen gas detection. The sensor involves providing a gas sample, generating modulated optical excitation sources, bringing the optical excitation source to the side of a metalized thin pyroelectric film, and detecting via a lock-in amplifier circuit the coherent differential signal resulting from thermoreflectance and thermoabsorptance changes in the film when exposed to hydrogen gas.

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patent: 2004-354163 (2004-12-01), None

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