G - Physics – 01 – N
Patent
G - Physics
01
N
349/39
G01N 29/02 (2006.01) G01N 29/032 (2006.01) G01N 29/34 (2006.01) G01N 29/40 (2006.01) G01N 29/42 (2006.01) G01N 33/49 (2006.01)
Patent
CA 1074002
ABSTRACT OF THE DISCLOSURE A method and apparatus for determining the flow state of a flowable substance by transmitting ultrasonic or ultrasound waves of constant frequency to a spatial region of the substance, receiving ultrasonic waves back- scattered by the substance, converting the backscattered ultrasonic waves into a primary signal which is amplitude- and phase-modulated in accordance with the backscattering and demodulating the primary signal in order to obtain a modulation signal. This modulation signal can be divided into a spectrum of signal components of different frequency and possessing pseudo periods which are defined as the time intervals between successive momentary values of the modu- lation signal, such momentary values corresponding to one another. The time duration corresponding to a predetermined number of pseudo periods is compared with a predetermined time duration.
283370
Brandestini Marco
Lipp Hermann
LandOfFree
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