Optical inspection apparatus

Details Optical inspection apparatus Optical inspection apparatus

G - Physics

01

N

88/97, 340/123.4

G01N 21/89 (2006.01) A24C 5/34 (2006.01) G01N 21/952 (2006.01) G07C 3/14 (2006.01)

Patent

CA 1109942

ABSTRACT OF THE DISCLOSURE The inventions 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. - 1 -

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