Method and apparatus for detecting trace contaminents

Details Method and apparatus for detecting trace contaminents Method and apparatus for detecting trace contaminents

1990-04-20

1991-06-11

Anderson, Bruce C.

Radiant energy

Inspection of solids or liquids by charged particles

250304, 250307, G01N 2300, G01N 3100

Patent

active

050234528

ABSTRACT:
Apparatus and methods for identifying the nature of an unidentified substrate present in trace amounts of known gaseous or liquid media such as air or water include collecting a sample of the substance in the media, filtering and concentrating the sample, depositing at least a portion of the same on a known substrate, analyzing the deposited sample utilizing SETM, NFOM and/or AFM techniques to form one or more images characteristic of the unidentified substance, and then identifying the substance by comparing the images so obtained to images of known substances obtained using the same techniques.

REFERENCES:
patent: 4013888 (1977-03-01), Macias et al.
patent: 4178507 (1979-12-01), Brunnee
patent: 4594506 (1986-06-01), Ghaderi
patent: 4740298 (1988-04-01), Andresen et al.
patent: 4841145 (1989-06-01), Wada et al.

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