Infrared pick-up device comprising an infrared sensitive television pick-up tube

摘要

Infrared pick-up device comprising an infrared sensitive television pick-up tube and a diaphragm, which is alternately in the open and closed state, the amplitude of the available video signal being proportional to the speed at which the temperature changes, an additional, uniform radiation being superimposed on the scene radiation which can be changed so by a signal processing stage connected to the pick-up tube that the quantity of the average scene radiation plus the superimposed additional radiation is substantially equal to the radiation coming from the diaphragm in the closed state and acting on the target plate of the pick-up tube.