Low-Noise Indium Antimonide Photo-Cell
‘Mullards have introduced an indium antimonide photo cell with responses from visible light up to 5.4 micro metres. It is intended for applications involving infra-red spectroscopy and research into the properties of materials.’
So, 50 years ago, starts a story in Electronics Weekly’s issue of February 1st 1961.
The story continues:
‘The cell, which has a sensitive area of approximately 3 sq mm is attached to its own Dewar flask.’
‘Cooling is by means of liquid nitrogen, which enables a very good noise figure to be obtained.’
The story concludes:
‘The efficiency of the cooling is such that the cell can be used for 45 minutes without refilling the flask.’