The Secretary of State for Defence in Her Britannic Majesty's Government

The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland

Ralph S Hall

Charles Thomas Elliott

Timothy Ashley

Neil Thomson Gordon

A thermal imaging system (,) which is accoupled and by scanning recreates a thermal image by superimposing measured variations in infrared emission from a scene (,) onto a reference level supplied by a light emitting diode (,). The diode (,) is both a positive and negative luminescent emitter. Emitted flux is current controlled to be equivalent to black body radiation at a range of temperatures which may be colder or hotter than ambient. A signal generated with the system (,) switches between scene and diode observation is a measure of the difference between the mean scene temperature and the diode effective temperature. In response to this digital, control means adjust the bias current through the diode (,) in order to reduce the temperature difference. The reference temperature converges towards the mean scene temperature as this process is repeated. Absolute temperature is thus restored and some image defects removed.

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Malvern, United Kingdom

Ralph S Hall