Measuring and testing – Vibration – By mechanical waves
Patent
1987-07-06
1989-07-04
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
73600, G01N 2904
Patent
active
048438472
ABSTRACT:
A mechanically amplified electroacoustic transducer system comprising an electroacoustic transducer having a vibrating element and an amplifier rod forming a probe extending from the transducer and in acoustically coupling contact with the vibrating element over a relatively small region thereof. The probe has a length which is approximately equal to the quarter wavelength or a multiple of the quarter wavelength of the acoustical energy generated by the transducer, the exact length of the probe being selected to provide optimum output from the system at a selected operation frequency of the transducer. The invention also provides a method for detecting internal defects in an object which comprises placing the object between one or more transmitting electroacoustic transducer systems and a plurality of receiving electroacoustic transducer systems, each transducer system being as described above, bringing the tips of the transducer probes into contact with the object, energizing the or each transmitting transducer, obtaining electrical output signals from the receiving transducers, and determining from the amplitude or phase differences between the output signals the presence or absence of defects. The apparatus and method are especially suited to the detection of "hollow hearts" in potatoes.
REFERENCES:
patent: 2768524 (1956-10-01), Beard
patent: 3435950 (1969-04-01), Suverkrop
patent: 3546498 (1970-12-01), McMaster et al.
patent: 3908445 (1975-09-01), Verdon et al.
patent: 4249660 (1981-02-01), Woodland
patent: 4625555 (1986-12-01), Fujii
Birth, G. S., American Potato Journal, "A Nondestructive Technique for Detecting Internal Discolorations in Potatoes", vol. 37, pp. 53-60, (1960).
Jollimore Gregory R.
Russell Leslie T.
Watts Kenneth C.
Bell Robert
Canadian Patents and Development Limited
Carvellas Perry
Levy Stewart J.
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