Pulse doppler flow speed meter

Details Pulse doppler flow speed meter Pulse doppler flow speed meter

1989-12-27

1990-09-11

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 800

Patent

active

049553860

ABSTRACT:
A pulse doppler apparatus transmits a ultrasonic sound wave at transmission intervals T and T+Ts alternately and iteratively, detects the phase difference attributable to the doppler shift in the reflected sound wave signal at the interval T and the phase difference in the reflected signal at the interval T+Ts sequentially, detects the difference between both phase differences, and transforms the difference into a doppler frequency. The apparatus includes an MTI filter which exerts the same filtering characteristics on the reflected sound signals at both intervals T and T+Ts.

REFERENCES:
patent: 4583552 (1986-04-01), Iinuma
patent: 4660565 (1987-04-01), Shirasaka et al.
patent: 4751847 (1988-06-01), Katakura et al.

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