Measuring and testing – Vibration – By mechanical waves
Patent
1988-08-11
1989-12-05
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
12866109, G01N 2900
Patent
active
048844489
ABSTRACT:
A ultrasonic Doppler meter for measuring the speed of a moving body by measuring the phase shift due to the Doppler effect on received signals, comprising a transmitting/receiving unit transmitting ultrasonic bursts with a constant time interval towards the moving body and receiving reflected waves; a unit for measuring a phase difference vector representing a difference between phases of received signals corresponding to two successive transmitted pulses; a unit for calculating a difference between phase differences on the basis of two successive phase difference vectors stated above; and an accumulation unit for adding the difference between phase differences to a preceeding phase difference vector so as to obtain the speed of the moving object.
REFERENCES:
patent: 4771789 (1988-09-01), Namekawa
"Application of the Phase Detection Principle in a Transcutaneous Velocity Profile Meter", by M. Brandestini, Proc. of the 2nd Europ. Congress on Ultrasonics, p. 144, 1975.
JP-A-62-169072 (Corresponding to U.S. Patent Application Ser. No. 5,900 filed Jan. 22, 1987).
"Blood Flow Imaging Using a Discrete-Time Frequency Meter", by M. Brandestini et al., 1978 Ultrason. Symp. Proc. IEEE, Cat. #78, Ch. 1344-1SU.
"Color-Coded Blood Flow Imaging System Using Ultrasound Doppler" by K. Namekawa et al., 1985 (Corres. to English version, Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation Technique.
IEEE Trans. on Sonics and Ultrasonics vol. SU-32, No. 3, May 1985, U.S. Patent Application No. 101,444 filed Sep. 29, 1987 (corres. to JP-A-63-84533).
Ishikawa Shizuo
Katakura Kageyoshi
Nishiyama Hisashi
Ogawa Toshio
Arana Louis M.
Hitachi Medical Corporation
Levy Stewart J.
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