Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1994-05-23
1996-11-26
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250373, G01N 2117
Patent
active
055788297
ABSTRACT:
A light beam is passed through a tube containing a material being monitored and a contaminant wherein the light is absorbed by the contaminant or some form of the contaminant to the exclusion of the material being monitored. Since the amount of light passing through the tube is a function of the amount of contaminant in the tube, the amount of light detected at the downstream end of the tube is a function of the amount of contaminant in the material being monitored. The detected light can be used to provide a quantitative indication of the contaminant, to provide an alarm, to shut down the system to which the material being monitored is being delivered or for other purposes. When the material being monitored is HCl gas and the contaminant is moisture, the tube will generally be stainless steel to avoid galvanic effects since the remainder of the pipe system is generally also stainless steel and the light frequency will be from about 1.0 to about 2.0 micrometers which is a range of frequencies selective to water as opposed to HCl gas. When the material being monitored is aqueous ammonium hydroxide and the contaminant is a transition metal, preferably copper, the tube will be formed of a material inert to ammonium hydroxide, preferably a fluoropolymer with perfluoroethane being the preferred fluoropolymer and the light frequency will be from about 275 to about 350 nanometers which is a range of frequencies selective to a copper ammonium complex which is formed as opposed to aqueous ammonium hydroxide.
REFERENCES:
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patent: 5060508 (1991-10-01), Wong
Hogan Jeremiah D.
Talasek Robert T.
Brady Jim
Donaldson Richard
Fields Carolyn E.
Glick Edward J.
Hashim Paul
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