Thick film hydrogen sensor

Electrical resistors – Resistance value responsive to a condition – Gas – vapor – or moisture absorbing or collecting

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338307, 338320, H01C 700

Patent

active

054519209

ABSTRACT:
A thick film hydrogen sensor element includes an essentially inert, electrically-insulating substrate having deposited thereon a thick film metallization forming at least two resistors. The metallization is a sintered composition of Pd and a sinterable binder such as glass frit. An essentially inert, electrically insulating, hydrogen impermeable passivation layer covers at least one of the resistors.

REFERENCES:
patent: 3559457 (1971-02-01), Collins
patent: 4624137 (1986-11-01), Johnson et al.
patent: 4908118 (1990-03-01), Ammende et al.
patent: 4976991 (1990-12-01), Ammende et al.
patent: 5338708 (1994-08-01), Felten
P. A. Michaels, "Summary Report: Design, Development and Prototype Fabrication of an Area Hydrogen Detector (5 Apr. 1963 through 4 Apr. 1964)," Sep. 1964.
P. J. Shaver, "Bimetal Strip Hydrogen Gas Detectors," The Review of Scientific Instruments, vol. 40, No. 7, pp. 901-905, Jul. 1969.
M. A. Butler and D. S. Ginley, "Hydrogen Sensing with Palladium-Coated Optical Fibers," J. Appl. Phys., 64(7), pp. 3706-3712, 1 Oct. 1988.

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