Surface wave gas sensor

Details Surface wave gas sensor Surface wave gas sensor

1991-09-24

1993-06-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

73 2401, H01L 4108

Patent

active

052218716

ABSTRACT:
A high-sensitivity surface wave gas sensor in which the interaction of a surface wave field with a solid film suitable for adsorbing the gas to be determined causes a change in the frequency of an oscillating circuit containing a surface wave delay line as a function of the type and concentration of the gas entails the delay line provided for adsorption of the gas being completely coated with the solid film, and the dimensions of the delay lines being such that the length of the surface wave transformer is greater than that of the delay line.

REFERENCES:
patent: 4243960 (1981-01-01), White et al.
patent: 4312228 (1982-01-01), Wohitjen
patent: 4547648 (1985-10-01), Longway
patent: 4726225 (1988-02-01), Brace et al.
patent: 4932255 (1990-06-01), Brace et al.
patent: 5051645 (1991-09-01), Brace et al.
patent: 5076094 (1991-12-01), Frye et al.
Wohitjen, Sensors and Actuators, 5 (1984) 307-324.
Sensors and Actuators, 10 (1986) 47-64, Venema et al.

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