Measuring and testing – Gas analysis – Gas chromatography
Patent
1980-06-24
1982-11-30
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
G01N 3106
Patent
active
043610269
ABSTRACT:
This disclosure relates to a method and apparatus for sensing the presence of gases, vapors, and liquids using surface acoustic waves. At the present time the commercially available devices for measuring the presence of fluids, although fast reacting and generally quite accurate, are very expensive and bulky. Further, these devices do not lend themselves to advanced integrated signal processing and digital techniques. This disclosure describes a precise, fluid sensing unit that is small, easily integrated, and relatively inexpensive to fabricate. The apparatus includes a medium on which surface acoustic waves can be propagated, transmitting and receiving transducers, and a sensing member located across the path of the surface acoustic waves. The sensing member has a physical characteristic that varies the velocity and/or the attenuation of the waves when in the presence of the specific fluid being detected. The presence of the fluid is sensed by the apparatus by measuring the variation in the surface acoustic waves resulting from this interaction.
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Muller Richard S.
White Richard M.
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