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1. (WO2018020098) SYSTEM AND METHOD FOR MEASURING A PHYSICAL PARAMETER OF A MEDIUM

Pub. No.:    WO/2018/020098    International Application No.:    PCT/FR2017/051901
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Wed Jul 12 01:59:59 CEST 2017
IPC: G01N 21/64
G02B 21/00
Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - CNRS -
ECOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS
Inventors: FORT, Emmanuel
LEVEQUE-FORT, Sandrine
BOURG, Nicolas
Title: SYSTEM AND METHOD FOR MEASURING A PHYSICAL PARAMETER OF A MEDIUM
Abstract:
Method and system for measuring a physical parameter of a target region of a medium, in which: an excitation wave is emitted, the wavelength of which has a periodic time-modulation of a physical characteristic; a return wave is periodically deflected with a controllable deflecting element (4), such that the deflected wave scans an array of transducers (3), each transducer (6) being associated with a predefined phase range of the periodic modulation; a phase image is recorded during at least one period of the periodic modulation; a phase shift is determined, from the phase image, between a periodic modulation of the return wave and the periodic modulation of the excitation wave; and a physical parameter of said target region is determined from the phase shift.