| 摘要 |
<p>The present invention relates to a method of determining a property (P(t)) of a process fluid (5) flowing through a pipe (6) using acoustic signals. The method comprises the steps of providing (102), based on a series of stimulus samples (X n ), an electric stimulus signal (x e (t)) to a transmitter member (2) for transmitting an acoustic stimulus signal (x(t)) into the process fluid; receiving (103), using a receiver member (3), an acoustic response signal (y(t)) from the process fluid; transforming the acoustic response signal (y(t)) to an electric response signal (y e (t)); sampling (104) the electric response signal (y e (t)) at sampling times separated by a sampling period (t s ), to form a series of response samples (y n ); determining (108) a transfer function (H(s)) based on the series of stimulus samples and the series of response samples being shifted by a number (k) of sampling periods (t s ) corresponding to a propagation delay (T) of a measurement chain comprising the transmitter member (2), the process fluid (5) and the receiver member (3); and determining (109) the property (P(t)) based on the transfer function (H(s)).</p> |
