公开(公告)号：US20170138773A1

公开(公告)日：2017-05-18

申请号：US15322456

申请日：2015-06-29

Applicant: PCME LIMITED

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

IPC: G01F1/66

CPC classification number: G01F1/667 ,  G01F1/662 ,  G01F23/2962 ,  G01P5/248

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).

公开(公告)号：US20190195768A1

公开(公告)日：2019-06-27

申请号：US16322370

申请日：2017-07-28

Applicant: PCME Limited

Inventor： David Christopher Unitt ,  Trevor Allan Lye ,  Bruce Greetham

IPC: G01N15/10 ,  G01F1/74 ,  G08B17/107

CPC classification number: G01N15/10 ,  G01F1/74 ,  G01N15/0205 ,  G01N21/15 ,  G01N21/53 ,  G01N2015/0096 ,  G01N2015/1075 ,  G01N2021/536 ,  G01N2201/024 ,  G01N2201/12707 ,  G08B17/107

Abstract: A method and apparatus (1) for monitoring particles flowing in a stack are disclosed. The method comprises emitting light from a light source along an optical path for scattering from the particles, rotating a rotatable monitoring assembly (15) mounted in the optical path, and detecting the scattered light using a detector. The rotatable monitoring assembly (15) contains at least two in apertures, and the method further comprises rotating the rotatable monitoring assembly (15) into a plurality of different configurations. In an operation configuration, light passes through the rotatable monitoring assembly (15) and into the stack unimpeded. In a zero-check configuration, the rotatable monitoring assembly (15) blocks the light from reaching the stack. In a span-check configuration, light of varying intensity passes from the light source through the rotatable monitoring assembly (15) into the stack. In a contamination-check configuration, the light is reflected through the rotatable monitoring assembly (15) onto the detector, without entering the stack. In the safety-shutter configuration, the rotatable monitoring assembly (15) protects optical components in the instrument from particles in the stack.

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).

公开(公告)号：US20170248454A1

公开(公告)日：2017-08-31

申请号：US15119414

申请日：2015-02-13

Applicant: PCME LIMITED

Inventor： Roger Bradley Millington ,  Archibald Simon Reid

IPC: G01F1/66 ,  G01P5/24

CPC classification number: G01F1/662 ,  G01F1/667 ,  G01P5/245

Abstract: An ultrasonic flow probe (100) comprising a mounting member (101) for mounting on a surface of a conduit and thereby defining a mounting axis (B) perpendicular to the surface, a frame (103) mounted on the mounting member (101), and a plurality of ultrasonic transducers (105) mounted on the frame (103) and aligned along a primary axis (A); wherein the frame (103) and mounting member (101) are configurable such that the primary axis (A) is at an angle to the mounting axis (B) so that, in use, ultrasound passing between the transducers (105) travels at an angle to fluid flowing in the conduit.