Radiation detection of gas compositions
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United States of America Patent
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-
Oct 27, 1981
Grant Date -
N/A
app pub date -
Nov 29, 1979
filing date -
Nov 29, 1978
priority date (Note) -
Expired
status (Latency Note)
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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.
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