Improved Camera-Tube Performance with Pulsed Operation.
AEROSPACE CORP EL SEGUNDO CALIF AEROPHYSICS LAB
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A new electronic technique is discussed for improving-the performance of a wide range of camera tubes vidicons. Specifically, this technique significantly increases vidicon sensitivity by synchronously controlling the sensing-layer bias. Operational principles governing this new technique are explained in terms of the standard physical model that describes vidicon performance. The two pulsed operation methods discussed in this paper are referred to as the integrated-saturation and discharge modes. The video-signal enhancement is achieved in real time without requiring any computer-signal processing or additional data-reduction circuity. Two other noteworthy features of this electronic technique are that image enhancement can be achieved without detrimentally affecting other tube parameters and be monitored with standard television equipment. The video enhancement anticipated with this synchronous pulse technique was verified experimentally. Four types of different camera tubes were tested in both the integrated-saturation and discharge pulsed modes. The results also indicated that dynamic range, in most cases, increased by approximately 50 while other vidicon transfer characteristics remained unaffected by pulsed mode operations.
- Electrooptical and Optoelectronic Devices
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