Humidity sensing element

Details Humidity sensing element Humidity sensing element

1981-12-03

1984-01-31

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

733365, H01G 520

Patent

active

044293437

ABSTRACT:
A humidity sensing element of the capacitance sensing type having two sets of interdigitated fingers of thin film platinum deposited on a glass substrate, all covered by a coating of water absorbing material such as cellulose acetate butyrate or a silicone rubber. The coating is of thickness such that it is substantially equal to or greater than the period of the fingers of the interdigitated electrodes.

REFERENCES:
patent: 2707880 (1955-05-01), Wannamaker
patent: 2828454 (1958-03-01), Khouri
patent: 3802268 (1974-04-01), Thoma
Channon "A Thick Film Humidity Sensor" Conf. on Hybrid Microelectronics, Loughborough, Leics England 9-11 Sept. 1975 pp. 57-62.
Birks "Modern Dielectric Materials" Haywood & Co. London 1960 pp. 150-154.

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