Method for photopyrolitically removing a contaminant

Details Method for photopyrolitically removing a contaminant Method for photopyrolitically removing a contaminant

1995-01-26

1997-08-12

Warden, Jill

Cleaning and liquid contact with solids

Processes

Including application of electrical radiant or wave energy...

134 21, 2504921, B08B 700

Patent

active

056560966

ABSTRACT:
A method for safely removing even a hazardous contaminant from a substrate surface without either precoating the contaminant or constantly flowing an inert gas thereover is disclosed. A pulsed source of light energy having an output spectrum including an infrared component and a visible component is directed upon the contaminant. The directed energy being sufficient in magnitude to carbonize or to decompose the contaminant. Preferably produced by a flashtube, the energy has a repetition rate ranging from about 0.1 to 12 pulses/second, and a peak energy per pulse exceeding about 3,700 Joules. The sound and/or sound level at the pulsed source of light energy may be monitored as a guide to varying the light source energy characteristics to best effect contaminant removal.

REFERENCES:
patent: 4867796 (1989-09-01), Asmus et al.
patent: 5024968 (1992-06-01), Engelsberg
patent: 5068040 (1991-11-01), Jackson
patent: 5147125 (1992-09-01), Austin
patent: 5151135 (1992-09-01), Magee et al.
patent: 5328517 (1994-07-01), Cates

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