Measuring and testing – Vibration – By mechanical waves
Patent
1980-10-09
1982-12-21
Kazenske, Edward R.
Measuring and testing
Vibration
By mechanical waves
73611, 73615, 73619, 73290V, 128660, 367101, G01N 2904, G01N 924, G01F 2300, G01S 1532
Patent
active
043642730
ABSTRACT:
Apparatus to detect and/or locate an inhomogeneity in a medium comprises a transducer to transmit frequency-modulated ultrasonic energy through the medium and a transducer to receive reflected energy. The transducers are connected to a phase-locked loop which maintains a required relationship between the phase of the transmitted modulation and the phase of the received modulation by adjustment of the modulation frequency. The modulation frequency adjustment is kept within predetermined upper and lower frequency limits so that the loop can lock only on to received ultrasonic energy which has travelled a distance within a predetermined region in the medium. The energy may be scanned across the region to produce a profile of the inhomogeneity, such as tissue at a certain depth within a limb.
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Ultrasonic Testing of Materials, 2nd Ed. by Krautkramer et al., published 1977 by Springer-Verlag, pp. 176-178.
Measurements and Control, vol. 13, No. 1, Jan 1980, London, by R. J. Redding, "A New Genus of Transducer?" pp. 27-30.
Carlson David V.
Kazenske Edward R.
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