Measuring and testing – Vibration – By mechanical waves
Patent
1984-03-19
1985-10-08
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73599, G01N 2900
Patent
active
045452504
ABSTRACT:
This invention relates to an apparatus for measuring of imaging the characteristic structure of a medium utilizing the power spectrum profile of received signal waves, which are derived from an incident beam pulse of ultrasonic waves or other waves that are incident on the object to be measured and which travel through the object by transmission and reflection. They are affected by various acoustic characteristic structures of the object, and information about the structure can be attained by the procession of the signals received with a transducer. The processing is performed by taking their cepstrum, and filtering the slowly varying cepstra including that of the target Gaussian shaped pulse signal from the fast varying cepstra. The filtered cepstrum is processed further by the inverse transformations to the power spectrum derived from said filtered cepstrum. The influence of line cepstra remaining still in the lower frequency and the frequency dependence of the reflection indices of the structure to the derived power spectrum is eliminated by the distortion indices of said derived power spectrum. Thus the travelled power spectrum is recovered as a virtual spectrum, expected when such influences do not exist. Tissue characteristics are extracted from the recovered spectrum. The distortion indices are represented by various order moments of the derived power spectrum.
REFERENCES:
patent: 4052889 (1977-10-01), Mucciardi et al.
Fujitsu Limited
Kreitman Stephen A.
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