SENSITIVITY CORRECTION SYSTEM FOR PHOTOCONDUCTING TYPE INFRARED DETECTOR

摘要

PURPOSE:To achieve a higher detection accuracy of an infrared detector by using an AC component from an infrared detector as measuring signal corresponding to the quantity of infrared rays and a DC component as correction signal. CONSTITUTION:Infrared rays from an object to be photographed are reflected with a scan mirror 3 and condensed to a detector 1 with a condenser lens 2. The detector 1 with current biased has a terminal voltage thereof reflecting an element resistance R and an AC component of a voltage thereof is amplified with an amplifier 5 are a DC component thereof with an amplifier 6. A timing circuit 9 is a circuit which generates a system control signal to match the movement of a scan mirror 3. A reference light source 4 is adapted to regenerate DC with respect to an output of the amplifier 5 at a timing assumed by the detector 1 and an image signal is converted into digital with an A/D converter 8. On the other hand, an output of the amplifier 6 is digitalized with an A/D converter 10 and a microcomputer 11 determines a reference number of incident photons from the signal to be introduced into a formula for obtaining the subsequent object to be photographed.