Thin-film fiber optic hydrogen and temperature sensor system

Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample

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422 8212, 436144, G01N 2175

Patent

active

057831521

ABSTRACT:
The invention discloses a sensor probe device for monitoring of hydrogen gas concentrations and temperatures by the same sensor probe. The sensor probe is constructed using thin-film deposition methods for the placement of a multitude of layers of materials sensitive to hydrogen concentrations and temperature on the end of a light transparent lens located within the sensor probe. The end of the lens within the sensor probe contains a lens containing a layer of hydrogen permeable material which excludes other reactive gases, a layer of reflective metal material that forms a metal hydride upon absorbing hydrogen, and a layer of semi-conducting solid that is transparent above a temperature dependent minimum wavelength for temperature detection. The three layers of materials are located at the distal end of the lens located within the sensor probe. The lens focuses light generated by broad-band light generator and connected by fiber-optics to the sensor probe, onto a reflective metal material layer, which passes through the semi-conducting solid layer, onto two optical fibers located at the base of the sensor probe. The reflected light is transmitted over fiberoptic cables to a spectrometer and system controller. The absence of electrical signals and electrical wires in the sensor probe provides for an elimination of the potential for spark sources when monitoring in hydrogen rich environments, and provides a sensor free from electrical interferences.

REFERENCES:
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patent: 5637507 (1997-06-01), Wicks et al.
Frazier, G. A. "Thermoreflectance of palladium hydride" AIP Conference Proceedings, No. 40, (1978), pp. 342-347 1978.
Kazansky, V.B. et al "The unusual properties of small platinum particles supported on basic carriers" Stud Surf. Sci. Catal. vol. 92 (1994)pp. 275-280 1994.
Majkrzak, C.F. et al "Determination of hydrogen(deuterium) density profiles in thin metal films and multilayers by neutron reflection" Mater. Res. Soc. Symp. Proc., vol. 166, (1990) pp. 127-132 1990.

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