Servo System for the Athermalisation of a Germanium Lens,
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)
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This memorandum describes a simple electronically controlled servo system that was developed to athermalise the geranium lens of a radiometer operating in the infra-red waveband. The system athermalisation was demonstrated, with the result that the radiometer signal was held to within 95 of maximum for a or - 20 C lens temperature change this compares with a signal loss of over 90 with no athermalisation.