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1. (WO2018158276) METHOD OF DETERMINING OPERATION CONDITIONS OF A LASER-BASED PARTICLE DETECTOR
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Pub. No.: WO/2018/158276 International Application No.: PCT/EP2018/054853
Publication Date: 07.09.2018 International Filing Date: 28.02.2018
IPC:
H01S 5/183 (2006.01) ,H01S 5/00 (2006.01) ,H01S 5/062 (2006.01) ,G01N 15/02 (2006.01) ,G01S 7/491 (2006.01) ,G01N 15/14 (2006.01) ,H01S 5/026 (2006.01) ,H01S 5/065 (2006.01) ,G01N 15/00 (2006.01) ,G01N 15/10 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
5
Semiconductor lasers
10
Construction or shape of the optical resonator
18
Surface-emitting lasers (SE-lasers)
183
having a vertical cavity (VCSE-lasers)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
5
Semiconductor lasers
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
5
Semiconductor lasers
06
Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
062
by varying the potential of the electrodes
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15
Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
02
Investigating particle size or size distribution
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
48
of systems according to group G01S17/58
491
Details of non-pulse systems
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15
Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
10
Investigating individual particles
14
Electro-optical investigation
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
5
Semiconductor lasers
02
Structural details or components not essential to laser action
026
Monolithically integrated components, e.g. waveguides, monitoring photo-detectors or drivers
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
5
Semiconductor lasers
06
Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
065
Mode locking; Mode suppression; Mode selection
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15
Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15
Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
10
Investigating individual particles
Applicants:
KONINKLIJKE PHILIPS N.V. [NL/NL]; High Tech Campus 5 5656 AE Eindhoven, NL
Inventors:
WEICHMANN, Ulrich; NL
HELLMIG, Joachim Wilhelm; NL
VAN DER LEE, Alexander Marc; NL
MOENCH, Holger Joachim; NL
Agent:
MUELLER, Frank; NL
DE HAAN, Poul, Erik; NL
Priority Data:
17158808.002.03.2017EP
Title (EN) METHOD OF DETERMINING OPERATION CONDITIONS OF A LASER-BASED PARTICLE DETECTOR
(FR) PROCÉDÉ DE DÉTERMINATION DES CONDITIONS DE FONCTIONNEMENT D'UN DÉTECTEUR DE PARTICULES À BASE DE LASER
Abstract:
(EN) The invention describes a method of determining operation conditions of a particle detector (200) for detecting a particle density of particles with a size of less than 20 µm, preferably less than 10 µm in a fluid, wherein the particle detector (200) comprises a laser (111), wherein the laser is a multimode Vertical Cavity Surface Emitting Laser, the method comprising the steps of: providing an electrical drive current to the laser (111) such that a laser beam (112) is emitted by the laser, varying the drive current within a predefined range of drive currents, determining an intensity signal of an optical wave within a laser cavity of the laser (111) as a function of the drive current, determining a noise measure of the intensity signal as a function of the drive current, determining a range of drive currents in which the noise measure is below a predefined threshold value, determining at least a part of the operation conditions of the particle detector (200) by choosing a drive current for particle detection out of the determined range of drive currents. The invention further relates to a particle detector (200) and a mobile device (190) comprising such a particle detector (200). The invention finally relates to a related computer program product.
(FR) La présente invention concerne un procédé de détermination des conditions de fonctionnement d'un détecteur de particules (200) permettant de détecter une densité de particules de particules ayant une taille inférieure à 20 µm, de préférence inférieure à 10 µm dans un fluide, le détecteur de particules (200) comprenant un laser (111), le laser étant un laser à émission de surface à cavité verticale multimode, le procédé comprenant les étapes suivantes consistant : à fournir un courant d'attaque électrique au laser (111) de telle sorte qu'un faisceau laser (112) est émis par le laser, à faire varier le courant d'attaque dans une plage prédéfinie de courants d'attaque, à déterminer un signal d'intensité d'une onde optique à l'intérieur d'une cavité laser du laser (111) en fonction du courant d'attaque, à déterminer une mesure de bruit du signal d'intensité en fonction du courant d'attaque, à déterminer une plage de courants d'attaque dans laquelle la mesure de bruit est inférieure à une valeur seuil prédéfinie, à déterminer au moins une partie des conditions de fonctionnement du détecteur de particules (200) par sélection d'un courant d'attaque pour la détection de particules hors de la plage déterminée de courants d'attaque. L'invention concerne en outre un détecteur de particules (200) et un dispositif mobile (190) comprenant un tel détecteur de particules (200). L'invention concerne finalement un produit-programme informatique associé.
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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: English (EN)
Filing Language: English (EN)