Container inspection apparatus having each output demodulated at

Details Container inspection apparatus having each output demodulated at Container inspection apparatus having each output demodulated at

1988-06-21

1989-09-12

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Containers or enclosures

250223B, G01N 2190

Patent

active

048654477

ABSTRACT:
Glassware inspection apparatus comprises a first light emitting diode position to illuminate a first region of the ware, a first driver for driving the first light emitting diode in a first modulated mode, a first photodetector positioned for receiving light of the first light emitting diode which illuminates the first region of the container, and a first demodulator for the output of the first photodetector. The apparatus also comprises a second light emitting diode positioned to illuminate a second region of the container, a driver for driving the second light emitting diode in a second modulated mode, a second photodetector positioned for receiving light of the second light emitting diode which illuminates the second region of the container, and a second demodulator for the output of the second photodetector. The two modulation modes minimize cross-talk between the first and second light emitting diodes.

REFERENCES:
patent: 3851975 (1974-12-01), Serret
patent: 3894806 (1975-07-01), Remy et al.
patent: 4165227 (1979-08-01), Frewin
patent: 4213042 (1980-07-01), Beach et al.
patent: 4265545 (1981-05-01), Slaker
patent: 4672200 (1987-06-01), Claypool et al.

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