公开(公告)号：US11353523B2

公开(公告)日：2022-06-07

申请号：US16755067

申请日：2018-10-10

Applicant: SINTEF TTO AS

Inventor： Sverre Knudsen ,  Matthieu Lacolle ,  Øyvind Nistad Stamnes ,  Sigbjørn Kolberg ,  Zeljko Skokic ,  Magnus Blihovde Hjelstuen ,  Jo Gjessing ,  Andreas Vogl ,  Ib-Rune Johansen

IPC: G01R33/032 ,  G01B9/02 ,  G01B11/16 ,  G01R33/02 ,  G02B26/00

Abstract: A field detector (2) comprises a field-responsive element (10) which undergoes a dimensional change when exposed to a predetermined field; and an interferometric read-out arrangement arranged to detect the dimensional change of the field-responsive element. A light source (4) is arranged to provide a measurement beam reflected from the field-responsive element (10) and a reference beam not reflected from the field-responsive element (10), an optical detector (6) being disposed so as to detect at least part of an interference pattern produced by the measurement beam and the reference beam. The field-responsive element (10) has a shape comprising a curved surface and is constrained at least one edge (12) thereof such that the dimensional change causes the curved surface to be displaced in a direction which changes an optical path length of the measurement beam relative to the reference beam, thereby changing the interference pattern detected by said optical detector.

公开(公告)号：US11867582B2

公开(公告)日：2024-01-09

申请号：US17275063

申请日：2019-09-05

Applicant: SINTEF TTO AS

Inventor： Sigbjørn Kolberg ,  Magnus Hjelstuen ,  Tor Arne Reinen

IPC: G01L5/24 ,  F16B31/02 ,  G01N29/12 ,  G01N29/34 ,  G01N29/07 ,  G01N29/32

CPC classification number: G01L5/243 ,  F16B31/028 ,  G01L5/246 ,  G01N29/12 ,  G01N29/343 ,  F16B2031/022 ,  G01N29/07 ,  G01N29/326 ,  G01N2291/044

Abstract: The invention relates to a solution for how to measure the strain in a washer mounted in a bolt assembly comprising a bolt, nut and washer. The invention concerns a strain measuring washer assembly comprising a plate shaped washer body, sound emitting means and sound detecting means, and a method for using such.

公开(公告)号：US20210190884A1

公开(公告)日：2021-06-24

申请号：US16755067

申请日：2018-10-10

Applicant: SINTEF TTO AS

Inventor： Sverre Knudsen ,  Matthieu Lacolle ,  Øyvind Nistad Stamnes ,  Sigbjørn Kolberg ,  Zeljiko Skokic ,  Magnus Blihovde Hjelstuen ,  Jo Gjessing ,  Andreas Vogl ,  Ib-Rune Johansen

IPC: G01R33/032 ,  G01R33/02 ,  G01B11/16 ,  G01B9/02 ,  G02B26/00

Abstract: A field detector (2) comprises a field-responsive element (10) which undergoes a dimensional change when exposed to a predetermined field; and an interferometric read-out arrangement arranged to detect the dimensional change of the field-responsive element. A light source (4) is arranged to provide a measurement beam reflected from the field-responsive element (10) and a reference beam not reflected from the field-responsive element (10), an optical detector (6) being disposed so as to detect at least part of an interference pattern produced by the measurement beam and the reference beam. The field-responsive element (10) has a shape comprising a curved surface and is constrained at least one edge (12) thereof such that the dimensional change causes the curved surface to be displaced in a direction which changes an optical path length of the measurement beam relative to the reference beam, thereby changing the interference pattern detected by said optical detector.