Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Patent
1990-11-13
1992-04-21
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Speed determination
G01S 1500
Patent
active
051074664
ABSTRACT:
A flow meter for detecting the average speed of an object in such a manner that an ultrasonic pulsed continuous wave is repeatedly transmitted toward the object to obtain a phase vector from the reception signal of the wave reflected from the object, the phase difference between consecutive ones of phase vectors obtained at an interval T equal to the period of transmitted wave is detected, a plurality of phase difference values are added and averaged to obtain an average phase difference value, and a Doppler frequency is calculated from the average phase difference value to obtain the average speed of the object, in which in order to remove an error caused by aliasing of an angle in the course of the arithmetic operation for obtaining the average phase difference value, a plurality of presumed average phase difference values having the error are calculated from the average phase difference value, the difference between the change of a phase caused by adding the phase difference values successively and the change of phase based upon each of the presumed average phase difference values is estimated to select the most appropriate one of the presumed average phase difference values, and the selected average phase difference value is used as a corrected average phase difference value.
REFERENCES:
patent: 4809703 (1989-03-01), Ishikawa et al.
patent: 4905206 (1990-02-01), Nishiyama et al.
Baker, Pulsed Ultrasonic Doppler Blood-Flow Sensing: IEEE Trans. SU-17, No. 3, pp. 170-185, 1970.
Kasi, Real-Time Two Dimensional Blood Flow Imaging Technique, IEEE Trans. SU-32, No. 3, pp. 458-464, 1985.
Ultrasonic Symposium Proceedings, pp. 348-352, 1978.
Katakura Kageyoshi
Nishiyama Hisashi
Ogawa Toshio
Hitachi Medical Corporation
Pihulic Daniel T.
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