Circuit arrangements for controlling detector signals in surface

Details Circuit arrangements for controlling detector signals in surface Circuit arrangements for controlling detector signals in surface

1976-02-24

1977-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214AG, 356200, G01N 2132

Patent

active

040485102

ABSTRACT:
In a surface inspection system a detector responds to light received from the surface to give a detector signal including disturbances due to surface faults, and includes an equalizer circuit to control the gain of a photomultiplier, and therefore signal amplitude, in response to a peak level detector, to control the level of the signal in relation to the amplitude of the disturbances and a band-pass filter to compensate for variations in the signals due to changes in the optical gain of the detector. The equalizer circuit is an amplifier and the control is achieved by way of feedback and feedforward control loops. In a modification the system may comprise a row of detectors and the equalizer circuit may be arranged to accommodate changes in the amount of light received at the junctions of detectors.

REFERENCES:
patent: 3582661 (1971-06-01), Emmasingel
patent: 3584963 (1971-06-01), Wisner
patent: 3601615 (1971-08-01), Maeda
patent: 3843890 (1974-10-01), Anthony et al.

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