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1. (WO2017098490) METHOD FOR CALCULATING LIGHT ABSORPTION COEFFICIENT IN FREQUENCY DOMAIN BY USING PHOTOACOUSTIC DETECTOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2017/098490 International Application No.: PCT/IB2017/050500
Publication Date: 15.06.2017 International Filing Date: 31.01.2017
IPC:
A61B 8/00 (2006.01) ,A61B 8/08 (2006.01) ,A61B 5/00 (2006.01) ,G01N 21/17 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
8
Diagnosis using ultrasonic, sonic or infrasonic waves
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
8
Diagnosis using ultrasonic, sonic or infrasonic waves
08
Detecting organic movements or changes, e.g. tumours, cysts, swellings
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
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
Applicants:
한밭대학교 산학협력단 HANBAT NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION [KR/KR]; 대전시 유성구 동서대로 125 125, Dongseo-daero Yuseong-gu Daejeon 34158, KR
Inventors:
강동열 KANG, Dong Yel; KR
Agent:
특허법인 플러스 PLUS INTERNATIONAL IP LAW FIRM; 대전시 서구 한밭대로 809 10층 10F, 809, Hanbat-daero Seo-gu Daejeon 35209, KR
Priority Data:
10-2015-017620310.12.2015KR
Title (EN) METHOD FOR CALCULATING LIGHT ABSORPTION COEFFICIENT IN FREQUENCY DOMAIN BY USING PHOTOACOUSTIC DETECTOR
(FR) PROCÉDÉ DE CALCUL DE COEFFICIENT D'ABSORPTION DE LUMIÈRE DANS UN DOMAINE FRÉQUENTIEL À L'AIDE D'UN DÉTECTEUR PHOTOACOUSTIQUE
(KO) 광음향 측정기를 이용하여 주파수 영역에서 광흡수계수를 산출하는 방법
Abstract:
(EN) A method for calculating a light absorption coefficient in a frequency domain by using a photoacoustic detector, according to the present invention, comprises the steps of: irradiating, at a light diffusion medium, an incident beam emitted through a light source so as to absorb the incident beam in an optical absorber positioned inside the light diffusion medium; measuring an ultrasonic signal value, which is generated from the optical absorber, by a photoacoustic detector positioned on the light diffusion medium so as to be focused on the inside of the light diffusion medium; allowing a processor connected to the light source and the photoacoustic detector to receive the measured ultrasonic signal value so as to measure a resonance frequency, which is the frequency when the intensity of the ultrasonic signal value in a frequency domain is the maximum value; and allowing the processor to calculate the light absorption coefficient of the optical absorber on the basis of the measured resonance frequency. According to the present invention, the light absorption coefficient of the optical absorber positioned inside of the light diffusion medium can be quantitatively calculated even if an effective scattering coefficient of the light diffusion medium is unknown.
(FR) Selon la présente invention, un procédé permettant de calculer un coefficient d'absorption de lumière dans un domaine fréquentiel à l'aide d'un détecteur photoacoustique comprend les étapes consistant à : exposer un milieu de diffusion de lumière à un rayonnement d'un faisceau incident émis par une source de lumière de sorte à absorber le faisceau incident dans un absorbeur optique positionné à l'intérieur du milieu de diffusion de lumière; mesurer une valeur de signal ultrasonore, qui est générée depuis l'absorbeur optique, au moyen d'un détecteur photoacoustique positionné sur le milieu de diffusion de lumière de sorte à être focalisé sur l'intérieur du milieu de diffusion de lumière; permettre à un processeur connecté à la source de lumière et au détecteur photoacoustique de recevoir la valeur de signal ultrasonore mesurée de sorte à mesurer une fréquence de résonance, qui est la fréquence lorsque l'intensité de la valeur de signal ultrasonore dans un domaine fréquentiel est la valeur maximale; et permettre au processeur de calculer le coefficient d'absorption de lumière de l'absorbeur optique sur la base de la fréquence de résonance mesurée. Selon la présente invention, le coefficient d'absorption de lumière de l'absorbeur optique positionné à l'intérieur du milieu de diffusion de lumière peut être calculé de manière quantitative même si un coefficient effectif de diffusion du milieu de diffusion de lumière est inconnu.
(KO) 본 발명에 따른 광음향 측정기를 이용하여 주파수 영역에서 광흡수계수를 산출하는 방법은, 광원을 통해 방출되는 입사빔을 광확산매체에 조사하여 상기 광확산매체의 내부에 위치하는 광흡수체에 흡수시키는 단계; 상기 광확산매체 상에 위치하여, 상기 광확산매체의 내부에 포커싱된 광음향 측정기로 상기 광흡수체에서 발생하는 초음파 신호값을 측정하는 단계; 상기 광원 및 상기 광음향 측정기와 연결되는 처리장치가 측정된 상기 초음파 신호값을 입력받아, 상기 초음파 신호값의 주파수 영역에서의 세기가 최대값일 때의 주파수인 공명주파수를 측정하는 단계; 및 상기 처리장치가 측정된 상기 공명주파수에 기초하여 상기 광흡수체의 광흡수계수를 산출하는 단계; 를 포함하여 이루어질 수 있다. 이러한 본 발명에 의하면, 비록 광확산매체의 유효산란계수를 알지 못하더라도 광확산매체 내부에 위치하는 광흡수체의 광흡수계수를 정량적으로 산출해낼 수 있게 된다.
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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 Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (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: Korean (KO)
Filing Language: Korean (KO)