Archives of Acoustics, 10, 3, pp. 273-280, 1985

Application of a phase loop system to analysis of a doppler signal in ultrasonic systems

Maciej Piechocki
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Michel Xhaard
Instrumentation et Dynamique Cardiovasculaire INSERM U265, Hopital Broussais
France

Pierre Peronneau
Instrumentation et Dynamique Cardiovasculaire INSERM U265, Hopital Broussais
France

This paper presents a way of applying a phase loop system to the measure¬ment of the instantaneous frequency of a Doppler signal in ultrasonic systems. This system was used to verify experimentally the dependence proposed by ANGELSEN [1], connecting the instantaneous probability distribution of the signal with its power spectrum. It presents measured results for two, laminar and turbulent, flows, and also an example of the operation of the phase loop system for a signal with a low signal to noise power ratio.
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