Method and device for detection of a substance

Details Method and device for detection of a substance Method and device for detection of a substance

1980-03-28

1982-07-06

Tokar, Michael J.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

7386105, G01R 528

Patent

active

043385680

ABSTRACT:
A method and device for detecting the presence of a substance having predetermined characteristics. More particularly, a device is disclosed wherein a discharge grid (20) is provided having a sufficiently high voltage potential across its grid electrodes (32 and 36) so that the substance having the predetermined characteristics will cause an electric spark discharge to occur between electrodes, the electric spark discharge altering the predetermined characteristics of the substance by oxidation and/or vaporization so that the substance is no longer detectable by an electric spark discharge. A means for counting the number of electric spark discharges is provided (96), a count providing an indication of the concentration of the substance having the predetermined characteristics. One embodiment disclosed detects longitudinally extending carbon fibers suspended in a gaseous medium (12). Another embodiment provides for the detection of carbon fibers (66) adhesively attached to a collection tape (68). The tape is positioned against the discharge grid (70) and a high voltage is periodically applied across the grid electrodes (71 and 72) until electric spark discharges no longer occur.

REFERENCES:
patent: 2783647 (1957-03-01), Stuart
patent: 3028490 (1962-04-01), Guilleux
patent: 3559049 (1971-01-01), Liebermann
patent: 3827217 (1974-08-01), Volsy
patent: 4090308 (1978-05-01), Stuck

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