Detection of anomalies in translucent material by candling

Details Detection of anomalies in translucent material by candling Detection of anomalies in translucent material by candling

1989-07-13

1990-12-18

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

356 53, 356239, G01N 2159

Patent

active

049782258

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.

REFERENCES:
Drawing of Scanner marketed by Erwin Sick GmbH of Munich, Germany since 1985.
Drawing of Experimental Equipment, entitled "Foreward and Backward Scatter Imaging Laser Scanning System" assembled by the National Research Council of Iceland in Mar. 1987.
Drawing of Alternative Construction Made by the National Research Council of Iceland in Mar. 1987.
H. E. Power--"The Effect of Various Lighting Conditions on the Efficiency of Candling Cod Fillets for Detection of Parasites"--J.F.R.B. Canada 15(4), 537-542 (1958).
G. H. Valdimarsson et al--"Detection of Parasites in Fish Muscle by Candling Technique"--J. Assoc. Off. Anal. Chem., vol. 68, No. 3 (1985).
K. C. Watts et al--"Search for an Optical Window for Cod Fillets"--an unpublished report for Fisheries and Oceans, Canada (no date).
D. L. Hawley--"Final Report: Fish Parasite Reserach"--Apr. 14, 1988.

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