Method of cleaning the reflector mirror in an optical dew point meter and an optical dew point meter equipped with a cleaning device
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United States of America Patent
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Nov 28, 1995
Issued Date -
N/A
app pub date -
Sep 1, 1994
filing date -
Apr 18, 1991
priority date (Note) -
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Abstract
A method of cleaning a reflector mirror in an optical dew point meter that measures the dew point or frost point of a sample gas by a process including the steps of bringing the sample gas into contact with the reflector mirror whose temperature is variable, projecting condensed rays of light or laser light onto said reflector mirror, and detecting the change in the intensity of scattered light and/or reflected light on account of the dew or frost formed on said reflector mirror, characterized by bringing a CO.sub.2 gas or a CO.sub.2 containing gas into contact with the reflector while the latter is in a cooled state, thereby condensing CO.sub.2 on the surface of the reflector mirror, and the subsequent step of heating the reflector mirror to vaporize the CO.sub.2 is dischosed.
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