Surface ionization detector for detecting trace amounts of...

Details Surface ionization detector for detecting trace amounts of... Surface ionization detector for detecting trace amounts of...

G - Physics

01

N

G01N 27/62 (2006.01) G01N 30/64 (2006.01)

Patent

CA 2130975

27 ABSTRACT A surface ionization detector for detecting organic molecules such as illicit drugs and non- organo-nitrate explosives includes a heated surface and a collector electrode. A sample containing trace amounts of the organic molecules in ambient air is directed over the heated surface maintained at a temperature in the range of 500°C to 800°C, thereby causing the molecules to decompose into fragments. A polarization voltage between 18V and 24V is applied to ionize the fragments which are then collected by the collector electrode. An electrometer connected to the collector electrode measures the current and a change in the current indicates the presence of ionized fragments, and thereby indicates the presence of the organic molecules. The temperature of the heated surface and the polarization voltage are optimized for detection of particular organic molecules.

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