Improved surface ionization detector

Details Improved surface ionization detector Improved surface ionization detector

G - Physics

01

N

G01N 27/62 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2277596

The novel design of a surface ionization detector, for detecting trace amounts of organic molecules, for hand portable use, including a bifilar filament, rigidly supported at both ends and mounted on the same rigid base with a screen cathode, thus ensuring mechanical stability and reproducibility of measurement. The use of very small diameter wire for the filament provides a large surface/mass ratio, has lower power consumption and yet provides adequate sensitivity. An alternative approach for even lower power consumption is the use of a filament composed of a thin metal film deposited on a non-conducting substrate, such as quartz. The provision of multiple filaments, of different metals used simultaneously and sequentially, allows for improved detection and identification of species, or for longer detector lifetime.

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