Method and apparatus for detecting low volatility atmospheric va

Details Method and apparatus for detecting low volatility atmospheric va Method and apparatus for detecting low volatility atmospheric va

1990-04-03

1991-07-02

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

422 89, G01N 3086, G01N 3322

Patent

active

050276433

ABSTRACT:
An apparatus and method is provided for detecting terrorist bombs. The apparatus is operative to detect small amounts of low volatility atmospheric vapors which are emitted into the surrounding air from the bomb. The apparatus includes a heated inlet nozzle which delivers the air to a silicone membrane. A pair of identical capillaries are disposed downstream from the membrane, with one capillary being polarized, and the other being non-polarized. The heating of the inlet nozzle is periodically increased rapidly to cause extremely low volatility explosive vapors to evaporate and diffuse through the membrane. Detectors disposed downstream from the capillaries detect the presence of the vapors impinging thereon. Differences in the signals generated by the two detectors is indicative of the presence of an explosive. A microprocessor is provided to recalibrate the detectors after each heating cycle.

REFERENCES:
patent: 3568411 (1971-03-01), Dravnicks et al.
patent: 4116042 (1978-09-01), Jenkins et al.

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