Circuit arrangements for controlling detector signals in...

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

G - Physics

01

D

340/123.3

G01D 5/26 (2006.01) G01N 21/89 (2006.01)

Patent

CA 1068371

A B S T R A C T 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 equaliser 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 equaliser 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 equaliser circuit may be arranged to accommodate changes in the amount of light received at the junctions of detectors.

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