Measuring and testing – Vibration – By mechanical waves
Patent
1984-06-01
1987-03-10
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73602, G01N 2900
Patent
active
046482768
ABSTRACT:
The present invention relates to an apparatus which determines the distribution of the attenuation slope coefficient on a real-time basis using the center frequency shift. In one embodiment, the phase difference between a received signal and a reference signal is determined using EXCLUSIVE OR gates or an inverse trigonometric relation stored in a ROM. The phase difference is input to a differentiator which outputs the center frequency shift of the received signal on a real-time basis. The center frequency shift is input to another differentiator which outputs the attenuation slope coefficient. In other embodiments, the received signal is distributed into received signal bands, having different center frequencies, and signal characteristics of the received signal bands are averaged to remove virtually all effects of spectrum scalloping in the time domain. Thus, the attenuation slope coefficient is obtained without the effects of spectrum scalloping using simple hardware and without Fourier transformation.
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Kuc, Roman et al., "Parametric Estimation of the Acoustic Attenuation Coefficient Slope for Soft Tissue", 1976 Ultrasonics Symposium Proceedings, IEEE Cat. #76, pp. 44-47.
Klepper John R.
Miwa Hirohide
Murakami Keiichi
Reid John M.
Shimura Takaki
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