Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1975-10-22
1977-04-26
Church, Craig E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250346, G01N 2126
Patent
active
040203450
ABSTRACT:
A detector for an IR analyzer is disclosed, wherein the blank sample (that is, a quantity of the compound which is searched in a liquid or gaseous sample in which the component is searched for) is replaced by an optical filter, preferably an interference filter. A combination of reflecting walls for the instrument casing and the inner body is also disclosed, the assembly being completed by a window for the flow of the IR radiations and by two thermistors inserted in a Wheatstone bridge circuitry, the unbalances of which are exploited both for detecting the presence of the searched for component and for measuring its concentration by comparison.
REFERENCES:
patent: 3517189 (1970-06-01), Meyer
patent: 3899252 (1975-08-01), Dimeff
patent: 3911277 (1975-10-01), Cederstrand
Church Craig E.
Leeds & Northrup Italiana S.p.A.
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