SIGNAL CURRENT OF PHOTOCONDUCTIVE T. V. PICK-UP TUBE UNDER PULSED EXPOSURE

When T. V. pick-up tube is used under pulsed exposure, one will find the sensitivity of the tube descreases slightly and the quality of the picture degrades. These disadvantages can bo overcome by the use of delay readout and pulsing the cathode with suitable bias potentials.Eegarding to the complexity of the target surface due to partial overlapping of the electron scanning lines, we divide the scanning raster on the target into two parts, then analyse the signal current of these parts after pulsed exposure respectively. The obtained formulas can be used for calculating the signal current characteristics, some special case have been calculated, which give the useful informations for selecting the cathode bias potentials. Finally the paper shows how to select a T.V.pick-np tube for pulsed exposure application.