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1. WO2017068301 - GAS-DETECTING DEVICE WITH VERY HIGH SENSITIVITY BASED ON A HELMHOLTZ RESONATOR

Publication Number WO/2017/068301
Publication Date 27.04.2017
International Application No. PCT/FR2016/052741
International Filing Date 21.10.2016
IPC
G01N 21/17 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
CPC
G01N 2021/1704
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
1702with opto-acoustic detection, e.g. for gases or analysing solids
1704in gases
G01N 21/05
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
01Arrangements or apparatus for facilitating the optical investigation
03Cuvette constructions
05Flow-through cuvettes
G01N 21/1702
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
1702with opto-acoustic detection, e.g. for gases or analysing solids
Applicants
  • AEROVIA [FR]/[FR]
  • UNIVERSITE DE REIMS CHAMPARGNE ARDENNE [FR]/[FR]
  • C.N.R.S. [FR]/[FR]
Inventors
  • RISSER, Christophe
  • ZENINARI, Virginie
  • PARVITTE, Bertrand
Agents
  • CASSIOPI
Priority Data
156002821.10.2015FR (Priority Withdrawn 20.04.2018)
156072409.11.2015FR (Priority Withdrawn 20.04.2018)
Publication Language French (fr)
Filing Language French (FR)
Designated States
Title
(EN) GAS-DETECTING DEVICE WITH VERY HIGH SENSITIVITY BASED ON A HELMHOLTZ RESONATOR
(FR) DISPOSITIF DE DÉTECTION DE GAZ À TRÈS FORTE SENSIBILITÉ BASE SUR UN RÉSONATEUR DE HELMHOLTZ
Abstract
(EN) The invention relates to a device comprising: a resonant tank (100) consisting of two primary tubes (105, 106) which are closed on the ends thereof and interconnected, close to each of the ends thereof, by two secondary tubes (109, 110), and provided with a gas-introducing means (118, 119); a first laser source (112) modulated to a first resonance frequency of the tank, which supplies an excitation energy in at least one of the primary tubes, with an emission wavelength corresponding to a local maximum absorption wavelength for a first gas, for generating a first stationary wave propagating along the secondary tubes; a second laser source (117) modulated to a second resonance frequency of the tank, which supplies an excitation energy in at least one of the secondary tubes, with an emission wavelength corresponding to a local maximum absorption wavelength for a second gas, for generating a second stationary wave propagating along the primary tubes; at least one acoustoelectric transducer (103, 104, 123, 124) arranged on a wall of each tube for detecting the acoustic signals produced in said tube; and means (120, 122) for processing the signals from the transducers in order to extract two amplitudes for the two stationary waves.
(FR) Le dispositif comporte : - une cuve (100) résonnante constituée de deux tubes primaires (105, 106) fermés à leurs extrémités et reliés entre eux, à proximité de chacune de leurs extrémités, par deux tubes secondaires (109, 1 10), munie d'un moyen d'introduction de gaz (1 18, 1 19), - une première source (1 12) laser modulée à une première fréquence de résonance de la cuve, qui fournit une énergie d'excitation dans au moins un des tubes primaires, à une longueur d'onde d'émission correspondant à une longueur d'onde d'absorption maximum localement pour un premier gaz, pour générer une première onde stationnaire se propageant le long des tubes secondaires, - une deuxième source (1 17) laser modulée à une deuxième fréquence de résonance de la cuve, qui fournit une énergie d'excitation dans au moins un des tubes secondaires, à une longueur d'onde d'émission correspondant à une longueur d'onde d'absorption maximum localement pour un deuxième gaz, pour générer une deuxième onde stationnaire se propageant le long des tubes primaires, - au moins un transducteur acousto-électrique (103, 104, 123, 124) disposé sur une paroi de chaque tube pour détecter les signaux acoustiques produits dans ce tube, - des moyens (120, 122) de traitement des signaux issus des transducteurs pour extraire deux amplitudes pour les deux ondes stationnaires.
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