Radiant energy detection apparatus

Details Radiant energy detection apparatus Radiant energy detection apparatus

1964-09-24

1976-01-06

Wilbur, Maynard R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250203R, 250211K, 250338, 244 316, 356152, H01j 3912, G01j 120

Patent

active

039315150

ABSTRACT:
Optical detecting, tracking and indicating apparatus for producing a target angular position signal independent of target intensity. A photoconductive detector element has four outer electrodes disposed in a rhombic pattern and a centrally disposed inner electrode. A pair of quadrantly phased, alternating current primary bias signals are coupled to oppositely disposed electrode pairs. The central electrode is coupled through a load impedance and a source of secondary bias signal at a second frequency differing from the first bias signal frequency. A composite signal including both phase and frequency components of the primary bias signals appears in the output. The composite signal varies with target position and intensity. A secondary output signal at the second frequency varies only with intensity. A divider circuit divides the composite signal by the secondary signal to produce an output signal which varies only in accordance with the relative position of radiant energy impingent on the photoconductor.

REFERENCES:
patent: 2952779 (1960-09-01), Talley
patent: 3143650 (1964-08-01), Mizen
Rhodes, "Introduction to Monopulse," McGraw-Hill, 1959, pp. 71-72.

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