Method and apparatus for the detection of foreign material in fo

Details Method and apparatus for the detection of foreign material in fo Method and apparatus for the detection of foreign material in fo

1974-12-30

1976-11-30

Nelms, David C.

Radiant energy

Radiation controlling means

Shields

250402, G21F 302

Patent

active

039951642

ABSTRACT:
Foreign material in a food substance is detected by placing it in a container filled with water to a level above the top of the food substance and moving the container through an X-raying chamber, the transmitted and detected X-rays being converted to electrical signal form. The signals are thresholded and then differentiated to obtain signals indicative of the edges of the foreign material while minimizing spurious signals due to voids or bubbles in the water or to edges of the container. Preferably the oppositely-directed differentiated pulses produced at the opposite edges of foreign material are both used to indicate presence of the foreign material.

REFERENCES:
patent: 3136892 (1964-06-01), Willett et al.
patent: 3715587 (1973-02-01), Burkhalter et al.
patent: 3768645 (1973-10-01), Conway et al.
patent: 3774041 (1973-11-01), Kaneko et al.
patent: 3843890 (1974-10-01), Anthony, Jr. et al.
patent: 3881110 (1975-04-01), Hounsfield et al.

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