Progress In IR Television Using The Pyroelectric Vidicon

Abstract

This paper reviews and updates the progress in pyroelectric vidicon research and development. The principal items are high readout efficiency for low picture lag, high thermal impedance at the picture element for a high spatial resolution, good target uniformity and cosmetics, low readout noise, and camera design and signal processing.To illustrate the camera potential, a portable camera designed as a fire fighting aid is described.

Pyroelectric Materials and Devices

“…DTGS (Tc=61 °C, 8=42, Fv=0.6m 2 C-I ) gave an extension of operation up to 45 °C and a signal current in the region of 0.7-1 nAIK, and requires a moderate pedestal current of lOOnA (C=8oF, 25 Hz). TGFB and DTGFB were reported [79] to have high merit but the hygroscopic nature and the toxicity in handling resulted in DTGS as the material being carried through to production [80]. Pedestal current may be generated [81] by using the flyback of the electron beam, either by ionizing helium gas introduced during tube manufacture, or by removing electrons from the target surface by secondary electron emission.…”

<title>Detection of radiation direction of CO<formula><inf><roman>2</roman></inf></formula> pulsed laser by the use of a pyroelectric camera</title>

“…When the irradiance produced on the target surface is W0by the temperature difference of the object L\Ts, the signal current of pyroelectric target can be written as Pw A is = szi:; (2) where P: pyroelectric coefficient of target material (C I cm2t) Substituting above values to formula (2), we obtain i -0.6 x iO (A) Reference has shown that the signal current is 0.4 nA when temperature difference is 0.2 t . It is thus clear that, this value is basically in conform with above estimation.…”