| 摘要 |
Method and apparatus relating to ultrasound flow probes Measurement of time of flight of ultrasound pulses comprises: transmitting the pulses across a fluid flow; detecting a waveform (200) of the pulses, generating a cross-correlation between the waveform (200) and a tone (210)and identifying a plurality of peaks (220) in the cross-correlation; fitting a curve template (310) to the waveform at locations (300) corresponding to the peaks (220)and identifying the location (330) of the minimum error; performing a further cross-correlation (420) between the waveform (200) and the tone(210) over only a portion of the waveform(200) containing the minimum error location (330); and determining the temporal location corresponding to the maximum (430) of the further cross-correlation (430). |
