METHOD OF CLEANING REFLECTOR MIRROR IN OPTICAL DEW POINT METER AND AN OPTICAL DEW POINT METER EQUIPPED WITH A CLEANING DEVICE

摘要

The invention relates to a method for the cleaning a reflector mirror in an optical apparatus measuring the dew point or a gas sample freezing temperature and which comprises bringing the sample into contact with the gas reflector mirror whose temperature is variable for projecting condensed rays of light or radiation laser on the reflective mirror, and detecting the change in intensity of light scattered and / or reflected light due to the dew or frost that forms on the reflector mirror. This method is characterized in that instead of CO2 or a gas containing CO2 into contact with the reflector, while the latter is in the cooled state, which creates a CO2 condensation on the surface of the reflector mirror, and in that in the process of heating the reflector mirror to obtain a CO2 vaporization.