Abstract
ULTRASONIC equipment has been used by the Timber Development Association for detecting flaws in wood, and its possible development for determining the presence of diseased tissues has been suggested1. The principle of this type of flaw detection is to generate pressure (sound) waves of very high frequency which are transmitted through suspect materials such as metals or plastics. When flaws are present, the reduction of the degree of transmission in the defective area can be measured. Ultrasonic waves produced by commercial flaw detectors do not harm the materials being tested. The equipment is portable.
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Agric., 63, 294 (1956).
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WAID, J., WOODMAN, M. A Non-Destructive Method of detecting Diseases in Wood. Nature 180, 47 (1957). https://doi.org/10.1038/180047a0
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DOI: https://doi.org/10.1038/180047a0
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