An analog electro-optical multiplier.
Anderson, Thomas McArthur
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An Analog Electro-Optical Multiplier, a simple and compact buiid state device with no moving parts, has been designed, constructed, and tested. Functionally, this device is the direct analog of the familiar servo-multiplier, being capable of multiplying one analog variable by up to seven other individual analog variables. The servo-driven potentiometer arm has been replaced by a photoconductive cell, illuminated by a low-power lamp, connected in a bridge circuit with two fixed resistors. The servomechanism driving the potentiometer arm has been replaced by a solid state operational amplifier driving the lamp in response to the value of the multiplicand. Accuracies of 0. 62 per cent of full scale have been obtained with this multiplier which has a dynamic range of 4 cps. An important advantage of this multiplier is the appreciable reduction in the number of operational amplifiers required compared to analog multipliers currently on the market, both for four quadrant and two quadrant multiplication. Initial experiments were conducted using the Raytheon Raysistor, an electro -optical device consisting of a light source and a CdSe photoconductive cell. The effects of signal heating, hysteresis, and signal voltage across these cells is discussed and compared with the improved characteristics of the CdS photocells which were used in the final design. The problem of uniformly illuminating several of these cells with a single lamp is discussed. In addition, the properties of miniature lamps with regard to light output, power requirements, and speed of response is considered.
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