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1. (WO2014202753) OPTICAL DISPLACEMENT SENSOR ELEMENT

Pub. No.:    WO/2014/202753    International Application No.:    PCT/EP2014/063025
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Sat Jun 21 01:59:59 CEST 2014
IPC: G01B 11/14
H04R 23/00
Applicants: SINTEF TTO AS
Inventors: LACOLLE, Matthieu
JOHANSEN, Ib-Rune
BAKKE, Thor
BJOR, Ole-Hermann
Title: OPTICAL DISPLACEMENT SENSOR ELEMENT
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..