Investigations of Near Infra-Red Radiations by Means of Image Converters

Details Investigations of Near Infra-Red Radiations by Means of Image Converters Investigations of Near Infra-Red Radiations by Means of Image Converters

Aug 1946

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1946natur.158..235v&link_type=abstract

Nature, Volume 158, Issue 4007, pp. 235 (1946).

Computer Science

Scientific paper

FOR rapid examinations of near infra-red light up to 15,000 A., image converters are very useful. Their main advantage lies in enabling one to `see' immediately what infra-red sensitized plates show only after involved processing. The spectrum under test is projected on to a photo-electric cathode of the type (Ag)-Cs2O, Cs, Ag-Cs. The number of photo-electrons released is proportional to the intensity of radiation on that particular part of the cathode; they are focused by an electronic lens and form a picture on the fluorescent screen, which can either be studied visually or photographed. The accompanying illustration shows a photograph (× 1.5) of the mercury spectrum. In addition to the visible lines a number of lines in the near infra-red part of the spectrum have appeared. On the original photographic plate we can also see some lines of longer wave-length, which cannot be seen on the reproduction.

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