Method and apparatus for detecting a contraband substance

Details Method and apparatus for detecting a contraband substance Method and apparatus for detecting a contraband substance

1985-06-04

1988-01-12

Levy, Stewart J.

Measuring and testing

Gas analysis

Gas chromatography

73864, G01N 122, G01N 3322

Patent

active

047182687

ABSTRACT:
A method of detecting contraband substances in freight cargo containers in which the container is agitated to disturb particulates therein, and air containing such particulates is then sampled and the particulates collected. The collected particulates include naturally occurring particulates which have absorbed vapors of the contraband substance during the entire time that the container has been closed, and also include particulates of the contraband substance itself. The collected particulates are then heated to a temperature above 160.degree. C. to drive off vapors indicative of the contraband substance and the vapors are analyzed in a mass analyzer.

REFERENCES:
patent: 3748905 (1973-07-01), Fletcher et al.
patent: 3942357 (1976-03-01), Jenkins
patent: 3998101 (1976-12-01), Bradshaw et al.
patent: 4045997 (1977-09-01), Showalter et al.
patent: 4202200 (1980-05-01), Ellson
patent: 4580440 (1986-04-01), Reid et al.

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