Gas enclosures for radiometric instruments - has portholes sealed by rings in perreriiripppppiphhpheeeeral grooves

摘要

Enclosures or cells are joined together and intended to contain gases which are traversed by an incident beam of radiation in e.g. IR radiometry. The enclosures (171 to 174) are on the front face of the device and are closed at this face by means of one or more portholes transparent to the radiation in question. The enclosures are sealed from the exterior by seals prepared in situ in peripheral grooves (221 to 224) at the opening of the enclosures. The sealant used may be an epoxy resin or pref. a silicone elastomer. The grooves are positioned on the front faces such that the effective area of the enclosures transversed by the incident beam of radiation is a maximum proportion of the total frontal surface area.