Doppler pseudorandom noise velocimeters

Details Doppler pseudorandom noise velocimeters Doppler pseudorandom noise velocimeters

1980-01-16

1982-03-23

Michell, Robert W.

Surgery

Truss

Pad

7386125, 367 90, 367100, A61B 1000

Patent

active

043207650

ABSTRACT:
This invention is directed to improved pseudorandom noise velocimeters and methods therefor, using the Doppler effect, to enable the external measurement of the speed of a moving target within a fixed conveying medium. In accordance with a preferred embodiment of the present invention a continuous pseudorandom ultrasonic noise signal formed by a repetitive code C having n different elementary segments S is radiated. Correlation between a received echo and the delayed radiated signal is accomplished by proceeding successively for each elementary segment, using a different measuring band, for a period corresponding to the period of each segment. The correlation values thus obtained are then stored and thereafter a Doppler low frequency curve is reconstituted by regrouping the correlation values corresponding to the different elementary segments of the repetitive code.

REFERENCES:
patent: 3158830 (1964-11-01), Clay
patent: 3631490 (1971-12-01), Palmiere
patent: 3940731 (1976-02-01), Cooper et al.
patent: 3953823 (1976-04-01), Katakura
Siegel, M. et al., "Doppler Flow Visualization Using Large Time-Bandwidth gnals," Acoustic Holography, vol. 7, 1978 Plenum Press, pp. 347-357.
Reed, E. W. et al., "The Measurement of Pulsating Gas Flow Velocities Using Pseudo-random Pressure Pulses", Measurement & Control, Oct. 4-7, 1972.
Waag, R. C. et al., "Instrumentation for Non-Invasive Cardiac Chamber Flow Rate Measurement", IEEE UTS Symposium, Boston, Oct. 1972.
Jethwa, C. P. et al., "Blood Flow Measurements Using Ultrasonic Pulsed Random Signal Doppler System", IEEE Trans. on Sonics & Ultransonics, vol. Su-22, No. 1, pp. 1-11, Jan. 1975.
Bendiak, P. J. et al., "Ultrasonic Random-Signal Flow Measurement System" Jrnl Acoustic Soc. America, vol. 56, No. 3, Sep. 1974, pp. 860-865.

Affiliated with

Also associated with

Rating

Doppler pseudorandom noise velocimeters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Doppler pseudorandom noise velocimeters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Doppler pseudorandom noise velocimeters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1647416