Radiation detection of gas compositions

Details Radiation detection of gas compositions Radiation detection of gas compositions

1979-11-29

1981-10-27

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250345, G01J 100

Patent

active

042975778

ABSTRACT:
The invention relates to gas monitoring. Hitherto gas, such as flue gas has been analysed either by sampling and analysing the sample or by a spectrometer. However sampling is unreliable, and spectrography involves sensitive and expensive equipment needing extensive protection against vibration. In the invention, gas is monitored in situ by providing an infra red source and an infra red detector spaced across a gas flow, with a filter cell filled with the gas component to be monitored disposed between them. The detector detects radiation direct from the source and passing through the filter cell, and the outputs from the detector are fed to a differencing and dividing circuit to provide an output that is a function of the amount of monitored gas component in the gas flow.

REFERENCES:
patent: 2534657 (1950-12-01), Bray
patent: 3678262 (1972-07-01), Herrmann
patent: 3679899 (1972-07-01), Dimeff
patent: 3793525 (1974-02-01), Burch et al.
patent: 3805074 (1974-04-01), McCormack
patent: 3869613 (1975-03-01), Link et al.
patent: 3878107 (1975-04-01), Pembrook et al.
patent: 3916195 (1975-10-01), Burch et al.
patent: 3926527 (1975-12-01), Pembrook et al.
patent: 4075481 (1978-02-01), Stoft et al.
Von Dr. W. Schaefer, Ultrarol-Analysatoren und andere Betriebsphotometer, VDI-Berichte Nr. 97, 1966.

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