Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1979-06-25
1981-04-07
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
250435, G01J 142, G01N 2164
Patent
active
042608902
ABSTRACT:
A fluorescent gas analyzer that provides a DC output signal that is proportional to the concentration of a given gas that fluoresces within a reaction cell over a predetermined interval is disclosed. The analyzer includes a detector combination and a compensation circuit that prevent the output signal from being affected by scattered excitation energy detected by the fluorescence detector or by variations in the excitation energy. The analyzer is particularly adapted for detecting fluorescence from SO.sub.2 that is excited by UV radiation.
REFERENCES:
patent: 3826920 (1974-07-01), Woodroffe et al.
patent: 3845309 (1974-10-01), Helm et al.
patent: 3906226 (1975-09-01), Okabe et al.
Schwarz et al., "Fluorescence Detection of Sulfur Dioxide in Air at the Parts per Billion Level", Analytical Chemistry, vol. 46, pp. 1024-1028, Jul. 1974.
Okabe et al., "Ambient Sulfur Dioxide Detector Based on a Fluorescent Method", Presented at 65th Meeting of Air Pollution Control Association at Miami Beach, Florida, Jun. 18-22, 1972.
Watts Donald A.
Wright Steven A.
Howell Janice A.
Monitor Labs, Incorporated
Smith Alfred E.
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