Automatic gain control for photosensing devices

Details Automatic gain control for photosensing devices Automatic gain control for photosensing devices

1977-06-02

1978-06-27

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214AG, 250214B, 356205, G01J 132

Patent

active

040977323

ABSTRACT:
A beam-of-light (BOL) sensor having means for regulating the intensity of the sensor light source to compensate for extraneous factors in its operating environment, e.g., dust accumulation, component aging, misalignment, etc., that may affect consistent sensor operation. The BOL sensor includes a photosensor whose output signal is compared against a reference signal to determine if the light source intensity is of the proper level. The comparison signal is used to gate clock pulses to a counter to adjust its stored count upward or downward, dependent on whether the light source intensity is low or high, respectively. A filter is provided to override interruptions in the photosensor output signal below a predetermined minimum time duration.

REFERENCES:
patent: 3297904 (1967-01-01), Lauxen
patent: 3721963 (1973-03-01), Jenne

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