Pseudorandom ultrasonic Doppler meter of liquid flow and profile with digital serial signal processing

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Authors

  • Z. TRAWIŃSKI Ultrasonic Department, Institute of Fundamental Technological Research, Polish Academy of Sciences, Poland
  • D. J. CATHIGNOL Institut Nationale de la Santé et de la Recherche Medicale, France

Abstract

This paper presents a new method and new ultrasonic device for "real-time" measuring velocity profiles of liquid flow in vessel. Previously a flowmeter with pseudorandom coding of the transmitted signal made it possible to measuring point on a precisely determined depth with respect to the position of the ultrasonic probe. In order to obtain data for the entire penetration depth of the ultrasonic beam with that method, a system consisting or so many delay-receiving systems as there is measuring points, in which we need data for, would have be built. While the presented original method only one transmitting-recciving system, enabling a measurement in all measuring points independently and at the same time.

References

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[2] D. J. CATHIGNOL, Signal-to-clutter ratio in pseudo random Doppler flowmeter, Ultrasonic Imaging, 8, 272-284 (1986).

[3] D. CATHIGNOL, C. FOURCADE, J. Y. CHAPELON, Transcutaneous blood flow measurements using pseudorandom noise Doppler system, IEEE Trans. on Biol. Engineer, BME-27, 1, 1980.

[4] D. CATHIGNOL, Z. TRAWIŃSKI, J. Y. CHAPELON, Pseudo-random Doppler flowmeter using serial processing. Proceedings of 1987 IEEE Ultrasonic Symposium, Denver, pp. 889-892.