Vapor detection apparatus and method using an acoustic interfero

Details Vapor detection apparatus and method using an acoustic interfero Vapor detection apparatus and method using an acoustic interfero

1991-11-12

1994-03-01

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

73 3106, G01N 2902

Patent

active

052897150

ABSTRACT:
A detector and method for identifying a chemical vapor and determining its concentration in the ambient atmosphere. The chemical detector apparatus preferably includes a means of collecting vapors in one atmosphere and transferring the vapors by injection into a chromatographic separation column. The exit of the separation column is confined by a nozzle which causes the vapors to be focused into a specific area of an acoustic wave interferometer wherein standing waves are created by constructive interference of waves reflected from a plurality of reflecting elements. Identification of vapor species is by a combination of timed adsorption rate peaks and temperature programmed desorption rates of the individual vapor species.

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D'Amico, A. et al. Palladium-Surface Acoustic Wave Interaction for H.sub.2 Detection. in Appl. Phys. Lett. vol. 42, No.3, pp. 300-301, Aug. 1, 1982.

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