Process for removing all ambiguity from the measurement by Doppl

Details Process for removing all ambiguity from the measurement by Doppl Process for removing all ambiguity from the measurement by Doppl

1985-04-04

1987-07-14

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367 91, 128663, 7386105, G01S 966, A61B 502, G01F 1708

Patent

active

046807390

ABSTRACT:
The present invention concerns a process for removing all ambiguity from the measurement by the Doppler effect of the speed of a target. It consists in obtaining a signal of Doppler shift relating to a series of ultrasonic pulses sent in the direction of the target and received after their reflection onto this target, the recurrence frequency of the pulses constituting an ambiguity limit of these speed measurements, wherein the measured Doppler shift is transposed by modulating the signal received by a signal at a frequency called determination frequency, so as to bring from a known value the spectral components to be analyzed in the useful measuring band and after measuring the true speed values are worked out by adjunction of a correction that depends upon the determination frequency that is used, this process being applicable to measuring the speed of blood in the medical field.

REFERENCES:
patent: 3617995 (1971-11-01), Goulet
patent: 3762221 (1973-10-01), Coulthard
patent: 4067236 (1978-01-01), Hottinger
patent: 4485821 (1984-12-01), Iinuma
patent: 4573477 (1986-03-01), Namekawa et al.
patent: 4583409 (1986-04-01), Lannuzel et al.
Sainz, A.; Roberts, V. C.; A New Approach to Doppler Ultrasound Flowmetry; Ultrasonics International Conference 1977.
1973 Ultrasonics Symposium Proceedings, Monterey, Calif., 507 Nov. 1973, Institute of Electrical and Electronics Engineers, . . . .
Elektronik, vol. 26, No. 4, 1977, Munich (DE); A Marganitz: "Mikrowellen-Tachometer misst beruhrunglos . . . ".

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