公开(公告)号：US11240607B2

公开(公告)日：2022-02-01

申请号：US17054981

申请日：2019-05-15

Applicant: SINTEF TTO AS

Inventor： Hallvard Angelskår ,  Thor Bakke ,  Ib-Rune Johansen ,  Matthieu Lacolle ,  Jakob Vennerød ,  Andreas Vogl ,  Dag Wang

IPC: H04R23/00 ,  G01B9/02

Abstract: An optical microphone assembly comprises a rigid substrate; an interferometric arrangement, a light source, at least one photo detector and an enclosure. The interferometric arrangement comprises a membrane and at least one optical element spaced from the membrane, wherein the at least one optical element comprises a surface of the substrate and/or is disposed on a surface of the substrate. The light source is arranged to provide light to the interferometric arrangement such that a first portion of the light propagates along a first optical path via the interferometric arrangement and a second portion of the light propagates along a second different optical path via the interferometric arrangement, thereby giving rise to an optical path difference between the first and second optical paths which depends on a distance between the membrane and the optical element. The photo detector(s) are arranged to detect at least part of an interference pattern generated by said first and second portions of light dependent on said optical path difference. The enclosure is arranged to form an acoustic cavity in fluid communication with one side of the membrane. The volume of the acoustic cavity is at least 3 mm multiplied by d2, where d is a diameter of the membrane.

公开(公告)号：US20210274291A1

公开(公告)日：2021-09-02

申请号：US17054981

申请日：2019-05-15

Applicant: SINTEF TTO AS

Inventor： Hallvard Angelskår ,  Thor Bakke ,  Ib-Rune Johansen ,  Matthieu Lacolle ,  Jakob Vennerød ,  Andreas Vogl ,  Dag Wang

IPC: H04R23/00 ,  G01B9/02

Abstract: An optical microphone assembly comprises a rigid substrate; an interferometric arrangement, a light source, at least one photo detector and an enclosure. The interferometric arrangement comprises a membrane and at least one optical element spaced from the membrane, wherein the at least one optical element comprises a surface of the substrate and/or is disposed on a surface of the substrate. The light source is arranged to provide light to the interferometric arrangement such that a first portion of the light propagates along a first optical path via the interferometric arrangement and a second portion of the light propagates along a second different optical path via the interferometric arrangement, thereby giving rise to an optical path difference between the first and second optical paths which depends on a distance between the membrane and the optical element. The photo detector(s) are arranged to detect at least part of an interference pattern generated by said first and second portions of light dependent on said optical path difference. The enclosure is arranged to form an acoustic cavity in fluid communication with one side of the membrane. The volume of the acoustic cavity is at least 3 mm multiplied by d2, where d is a diameter of the membrane.

公开(公告)号：US10190870B2

公开(公告)日：2019-01-29

申请号：US14899701

申请日：2014-06-20

Applicant: SINTEF TTO AS

Inventor： Matthieu Lacolle ,  Ib-Rune Johansen ,  Thor Bakke ,  Ole-Herman Bjor

IPC: G01B11/14 ,  H04R23/00

Abstract: The present invention relates to an optical displacement sensor comprising a first at least partially reflective surface and a second surface having a diffractive pattern, the surfaces being provided on elements having a variable distance between them, each surface pair defining a cavity between them. The sensor also comprising at least one light source transmitting light at least one a chosen wavelength range into said cavities and at least one light detector receiving light from the cavities, wherein said diffractive patterns are adapted to direct light toward at least one detector provided in a known position relative to said diffractive surfaces.

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：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.

公开(公告)号：US10514249B2

公开(公告)日：2019-12-24

申请号：US16215143

申请日：2018-12-10

Applicant: SINTEF TTO AS

Inventor： Matthieu Lacolle ,  Ib-Rune Johansen ,  Thor Bakke ,  Ole-Herman Bjor

IPC: G01B11/14 ,  H04R23/00

Abstract: The present invention relates to an optical displacement sensor comprising a first at least partially reflective surface and a second surface having a diffractive pattern, the surfaces being provided on elements having a variable distance between them, each surface pair defining a cavity between them. The sensor also comprising at least one light source transmitting light at least one a chosen wavelength range into said cavities and at least one light detector receiving light from the cavities, wherein said diffractive patterns are adapted to direct light toward at least one detector provided in a known position relative to said diffractive surfaces.

公开(公告)号：US10356533B2

公开(公告)日：2019-07-16

申请号：US15565350

申请日：2016-04-11

Applicant: SINTEF TTO AS

Inventor： Tobias Dahl ,  Matthieu Lacolle

IPC: H04R23/00 ,  G01S3/80 ,  G10L15/28 ,  H04R3/00 ,  G10L25/78 ,  H04R1/40 ,  G01S3/805 ,  G10L15/22 ,  G10L25/84 ,  G10L15/08 ,  G10L21/0216

Abstract: An optical microphone arrangement comprises: an array of optical microphones (4) on a substrate (8), each of said optical microphones FIG. 2 (4) providing a signal indicative of displacement of a respective membrane (24) as a result of an incoming audible sound; at first processor (12) arranged to receive said signals from said optical microphones (4) and to perform a first processing step on said signals to produce a first output; and a second processor (14) arranged to receive at least one of said signals or said first output; wherein at least said second processor (14) determines presence of at least one element of human speech from said audible sound.