Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1978-10-10
1983-12-27
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
2503591, 378 54, G01N 2300
Patent
active
044233272
ABSTRACT:
Food stuff maturity sensing and inspection apparatus particularly suited for sensing the maturity of head lettuce and the like. The sensing apparatus utilizes an x-ray radioactive source for directing radiation toward the growing vegetable, with an x-ray detector on the opposite side of the vegetable detecting the attenuation of the radiation caused by the density of the vegetable therebetween. The normal inverse exponential attenuation of radiation caused by an object between a source and sensor is effectively linearized by the use of a simple high accuracy logarithmic count rate circuit. The relatively low energy of x-ray emitters such as Cadmium 109 results in greater rates of change of the detected signal for a given change of density of the vegetables in the path of the radiation. The technique may also be used to detect foreign materials harvested with food crops from the density differences detected by the apparatus.
REFERENCES:
patent: 2706789 (1955-04-01), Hughes
patent: 3594579 (1971-07-01), Garrett et al.
Howell Janice A.
Painter Michael A.
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