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1. (WO2018065696) ELECTRICAL MEASUREMENT CIRCUIT, GAS DETECTOR AND METHOD FOR MEASURING A GAS CONCENTRATION
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Pub. No.: WO/2018/065696 International Application No.: PCT/FR2017/052583
Publication Date: 12.04.2018 International Filing Date: 26.09.2017
IPC:
G01N 29/02 (2006.01) ,B06B 1/02 (2006.01) ,G01H 13/00 (2006.01) ,G01N 29/036 (2006.01) ,G01N 29/24 (2006.01) ,G01N 29/32 (2006.01) ,G01N 21/17 (2006.01) ,H03B 5/32 (2006.01) ,H03H 9/24 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
02
Analysing fluids
B PERFORMING OPERATIONS; TRANSPORTING
06
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
B
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
1
Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency
02
making use of electrical energy
G PHYSICS
01
MEASURING; TESTING
H
MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
13
Measuring resonant frequency
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
02
Analysing fluids
036
by measuring frequency or resonance of acoustic waves
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
22
Details
24
Probes
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
22
Details
32
Arrangements for suppressing undesired influences, e.g. temperature or pressure variations
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
B
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
5
Generation of oscillations using amplifier with regenerative feedback from output to input
30
with frequency-determining element being electromechanical resonator
32
being a piezo-electric resonator
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9
Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
24
Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive
Applicants:
OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES [FR/FR]; Chemin de la Hunière 91120 Palaiseau, FR
Inventors:
LEVY, Raphael; FR
AOUST, Guillaume; FR
VERLHAC, Béatrice; FR
GUERARD, Jean; FR
LE TRAON, Olivier; FR
GAUDINEAU, Vincent; FR
Agent:
CABINET PLASSERAUD; 66 rue de la Chaussée d'Antin 75440 Paris Cedex 09, FR
Priority Data:
16 5955704.10.2016FR
Title (EN) ELECTRICAL MEASUREMENT CIRCUIT, GAS DETECTOR AND METHOD FOR MEASURING A GAS CONCENTRATION
(FR) CIRCUIT ÉLECTRIQUE DE MESURE, DÉTECTEUR DE GAZ ET PROCÈDE DE MESURE D'UNE CONCENTRATION GAZEUSE
Abstract:
(EN) An electric measurement circuit possesses an electrical reaction leg (2) for forming an oscillator (10) from a resonator (1), and furthermore possesses a measurement leg (4) the input of which is supplied by said electrical reaction leg (2). The measurement leg contains an adjustable phase shifter (41) so that an additional excitation force (Fpa) that is applied to the resonator in the measurement leg can be adjusted in phase quadrature with respect to an excitation force (Fx) that is applied to said resonator in the electrical reaction leg. Such an electrical measurement circuit is particularly suitable for forming a photoacoustic gas detector. Figure 1
(FR) A B R É G É CIRCUIT ELECTRIQUE DE MESURE, DETECTEUR DE GAZ ET PROCEDE DE MESURE D'UNE CONCENTRATION GAZEUSE Un circuit électrique de mesure possède une branche électrique de réaction (2) pour former un oscillateur (10) à partir d'un résonateur (1), et possède en outre une branche de mesure (4) qui est alimentée en entrée par ladite branche électrique de réaction (2). La branche de mesure contient un déphaseur ajustable (41) pour qu'une force d'excitation supplémentaire (Fpa) qui est appliquée au résonateur à partir de la branche de mesure puisse être ajustée en quadrature de phase par rapport à une force d'excitation (Fx) qui est appliquée audit résonateur à partir de la branche électrique de réaction. Un tel circuit électrique de mesure est particulièrement adapté pour former un détecteur de gaz à effet photo-acoustique. Figure 1
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)