Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-03-27
1976-12-14
Serwin, R.E.
Chemistry: physical processes
Physical processes
Crystallization
23254E, 73 23, G01N 2730, G01N 2764, G01N 3322
Patent
active
039972976
ABSTRACT:
A method and apparatus for detecting the presence of a particular constituent in a sampled atmosphere. The sample is drawn through two substantially identical flow paths, each path containing a detector. The conditions prevailing in one of the flow paths is such as to convert the particular constituent into matter which will not produce a response in the associated detector. When the particular constituent is vapor originating from an explosive the conversion can be by heating the flow path to a temperature at which the vapor breaks down into components which do not produce a response in the associated detector. In the absence of the particular constituent in the sampled atmosphere the signals from the two detectors are substantially equal but the presence of the particular constituent results in a difference in signals from the two detectors.
REFERENCES:
patent: 2449067 (1948-09-01), Guillemin, Jr.
patent: 3046098 (1962-07-01), Brasseur et al.
patent: 3425807 (1969-02-01), Levy
patent: 3753653 (1973-08-01), Brieva et al.
patent: 3883739 (1975-05-01), Jenkins
patent: 3909204 (1975-09-01), Allen
Isgrove Douglas Walter
Jenkins Anthony
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