公开(公告)号：US10852168B2

公开(公告)日：2020-12-01

申请号：US15322456

申请日：2015-06-29

Applicant: PCME LIMITED

Inventor： Neil D'Souza-Mathew ,  Robert Fryers ,  Roger Millington ,  David Unitt

IPC: G01F1/66 ,  G01P5/24 ,  G01F23/296

Abstract: 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).