Optical inspection apparatus

Details Optical inspection apparatus Optical inspection apparatus

1978-01-18

1980-06-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

209536, H01J 3912

Patent

active

042085780

ABSTRACT:
The invention relates to optical inspection apparatus for monitoring a continuously moving rod, the apparatus comprising a circular head through which the rod passes, a first set of fibre optic conductors which transmits light from a source to the head to illuminate the rod, and a second set of fibre optic conductors which pick up light reflected from the rod passing through the head and transmits the reflected light to a number of photoelectric elements. The second set of conductors are divided into angularly spaced groups around the head and adjacent groups lead to separate photoelectric elements. The outputs of the elements are fed via A.C. coupling means into separate channels connected to comparator means responsive to the noise signal level in the individual channels. The comparator means produces a fault pulse in the signal level in any one channel is greater than a preset allowable level. Each of the channels includes an amplifier for amplifying the noise signal, the level of the noise signal being fed back to control the amplifier gain so that the mean level of the amplified noise signal is maintained substantially constant.

REFERENCES:
patent: 3729636 (1973-04-01), Merker
patent: 3854587 (1974-12-01), McLoughlin
patent: 3986037 (1976-10-01), Faulhaber

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