公开(公告)号：US20240077371A1

公开(公告)日：2024-03-07

申请号：US18272198

申请日：2021-12-14

Applicant: University of Newcastle upon Tyne

Inventor： Richard David Whalley ,  Nima Ebrahimzade ,  Peter Jonathan Cumpson

IPC: G01L1/24 ,  G01B11/16

CPC classification number: G01L1/24 ,  G01B11/16

Abstract: A wall shear stress sensor comprising first and second optical gratings, an incident light source and a photodetector. The second optical grating overlaps the first optical grating such that the first optical grating and second optical grating form a Moiré fringe pattern, wherein the second optical grating is displaceable relative to the first optical grating in response to a wall shear stress imparted on the sensor, and wherein displacement of the second optical grating correlates with a phase shift in the Moiré fringe pattern. The incident light source is configured to sequentially illuminate a plurality of discrete locations distributed across the Moiré fringe pattern. The photodetector is configured to detect light intensity reflected from each discrete location on the Moiré fringe pattern. A method of using the sensor and a two dimensional wall shear stress sensor system are also disclosed.

公开(公告)号：US20240068892A1

公开(公告)日：2024-02-29

申请号：US18272269

申请日：2021-12-14

Applicant: University of Newcastle upon Tyne

Inventor： Richard David Whalley ,  Nima Ebrahimzade

IPC: G01L1/24

CPC classification number: G01L1/242

Abstract: A two-dimensional wall shear stress sensor comprising fixed and floating substrates, an incident light source and first and second photodetectors. The fixed substrate supports a first plurality of optical gratings. The floating substrate supports a second plurality of optical gratings superimposed over the first plurality of optical gratings to form a plurality of Moire fringe patterns comprising at least a first Moire fringe pattern extending in a first direction and a second Moire fringe pattern extending in a second direction different to the first direction. The floating substrate is displaceable relative to the fixed substrate in response to a wall shear stress imparted on the sensor, wherein displacement of the floating substrate correlates with a phase shift in at least one of the first and second Moire fringe patterns. An incident light source is configured to illuminate each of the plurality of Moire fringe patterns. The first photodetector system is configured to detect intensity of light reflected from the first Moire fringe pattern. The second photodetector system is configured to