G - Physics – 01 – B
Patent
G - Physics
01
B
73/53, 33/63
G01B 11/06 (2006.01)
Patent
CA 1053025
A B S T R A C T This invention relates to a measuring apparatus for measuring the thickness of a moving film. Broadly speaking this invention attains its result by providing an apparatus comprising a body having an area constituting a source of infra-red rays across which a film to-be- examined my be moved. There is means for heating the area to a constant temperature for maintaining uniform infra-red light intensity throughout said area, and there is infra-red ray measuring means positioned to receive rays from said source that have passed thru a part of said moving film for determining the diminution of intensity of such infra-red rays in passing thru the film. The above mentioned area comprises a black-body radiator in the form of an isothermal cavity constituting the infra-red source. The body has a pin-hole observation window thru which window the moving film is observed by the infra-red measuring means.
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