Fluorescent gas analyzer

Details Fluorescent gas analyzer Fluorescent gas analyzer

1982-04-07

1984-09-04

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

250343, G01J 142

Patent

active

044699468

ABSTRACT:
A fluorescent gas analyzer for analyzing gases by the fluorescence method. A flashtube which is operated in its pulse mode is used as a light source. First and second optical detectors respectively detect light of a first and second wavelength range, the light of the first wavelength range being emitted by the light source and the light of the second wavelength range being emitted from a gas sample irradiated by the light source. A pair of integrators respectively integrate the outputs of the first and second detectors. Processing means, including sample and hold circuits and a synchronous detector, are used to further process the signals so that the system output is independent of deterioration of the light source and fluctuations in the strength of the light source output and independent of stray capacitance effects.

REFERENCES:
patent: 3795812 (1974-03-01), Okabe
patent: 3845309 (1974-10-01), Helm et al.
patent: 4260890 (1981-04-01), Wright et al.
Ashton et al., "The use of double-beam detection systems with pulsed sources of vacuum ultraviolet radiation," Journ. of Phys. E. Scien. Inst. (Gt.B) vol. 3 (Sep. 1970).

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