Electronic bottle inspector having particle and liquid detection

Details Electronic bottle inspector having particle and liquid detection Electronic bottle inspector having particle and liquid detection

1978-10-23

1980-09-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250341, G01N 2124

Patent

active

042219612

ABSTRACT:
An electronic bottle inspector having particle and liquid detection capabilities through the use of sensing systems in the visible and infra-red light range. For particle inspection in the visible light range, light from a source, typically an incandescent source passing through the bottom of a bottle, is focused above the neck of the bottle to preset an image of the bottom of the bottle on a rotating scanner characterized by a generally non-reflective background having one or more reflecting segments thereon. The scanner rotates at high speed so that the reflecting segment or segments scans the image focused thereon, with at least the reflective segments being contoured so the light falling thereon from the respective portion of the bottle bottom image is focused onto a detector. The particulate matter on the bottom of the bottle will block the light, creating a dip in detector output when that portion of the image is scanned. For liquid detection one or more holes are provided through the non-reflective portions of the scanner, with an infra-red detector being located therebehind to detect the infra-red radiation passing through the holes. Filtering of the light received by the detector allows peaking of the sensitivity of the system around one of the absorption bands of the liquid, with a drop in AC coupled amplitude of the infra-red detector providing an indication of the presence of the liquid.

REFERENCES:
patent: 4121103 (1978-10-01), Calhoun
Food Processing, Mar. 1978, pp. 52-53.

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