Detection of anomalies in translucent material by candling
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United States of America Patent
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Dec 18, 1990
Grant Date -
N/A
app pub date -
Jul 13, 1989
filing date -
Jul 19, 1988
priority date (Note) -
Expired
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Abstract
A candling method for detecting anomalies in translucent material (10) e.g. parasites in fish fillets, comprises directing an illumination beam (Io) of light through the material. It has been discovered that improved results in terms of more reliable detection of anomalies, and the ability to locate such anomalies in thicker samples than has previously been possible, can be obtained by using a beam with a radius no greater than 1 mm and preferably no greater than 0.5 mm. For still better results the beam radius can be reduced to a value no greater than 0.1 mm, and even down to 0.05 mm.
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