Flash vapor sampling for a trace chemical detector

Details Flash vapor sampling for a trace chemical detector Flash vapor sampling for a trace chemical detector

2006-08-29

2006-08-29

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

C324S451000

Reexamination Certificate

active

07098672

ABSTRACT:
The presence of trace molecules in air is often determined using high sensitivity gas sensing instruments, such as an ion mobility spectrometer. Such devices are commonly utilized in the fields of explosives detection, identification of narcotics, and in applications characterized by the presence of very low airborne concentrations of organic molecules of special interest. The sensitivity of such instruments is dependent on the concentration of target gas in the sample. The sampling efficiency can be greatly improved when the target object is warmed, even by only a few degrees. A directed emission of photons in the range between infrared and ultraviolet light can be used to significantly enhance vapor emission.

REFERENCES:
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patent: 2002/0158211 (2002-10-01), Gillispie
U.S. Appl. No. 10/754,088, filed Jan. 7, 2004, Virtual Wall Gas Sampling for an Ion Mobility Spectrometer, Krasnobaev et al.
U.S. Appl. No. 10/818,434, filed Apr. 5, 2004, Modified Vortex for an Ion Mobility Spectrometer, Krasnobaev et al.

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