Systems and techniques for detecting the presence of foreign...

Details Systems and techniques for detecting the presence of foreign... Systems and techniques for detecting the presence of foreign...

2006-01-31

2006-01-31

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

Of light reflection

C250S22300B, C209S588000

Reexamination Certificate

active

06992771

ABSTRACT:
Systems and techniques for detecting the presence of foreign material in food utilizing optical backlighting and/or ultrasonic inspection are presented. In optical backlighting, a substantially monochromatic light source optically backlights a food stream with source light having a wavelength between about 500 and 600 nm. An image of the food stream is captured and the presence of foreign material is determined when a portion of the detected image exceeds a predetermined threshold. The technique is especially suitable for the detection of bone in chicken meat, and the light source can be a planar array of green LEDs. In ultrasonic inspection, a process stream is interrogated with pulses of ultrasound and the presence of foreign material is determined based on the detected off-angle ultrasound scattering response.

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