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1. WO2020110779 - OPTICAL MEASUREMENT DEVICE AND MEASUREMENT METHOD

Publication Number WO/2020/110779
Publication Date 04.06.2020
International Application No. PCT/JP2019/044883
International Filing Date 15.11.2019
IPC
G01S 17/32 2020.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
17Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
02Systems using the reflection of electromagnetic waves other than radio waves
06Systems determining position data of a target
08for measuring distance only
32using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
G01S 17/58 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
17Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
02Systems using the reflection of electromagnetic waves other than radio waves
50Systems of measurement based on relative movement of target
58Velocity or trajectory determination systems; Sense-of-movement determination systems
G01S 7/497 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/, G01S15/, G01S17/127
48of systems according to group G01S17/58
497Means for monitoring or calibrating
CPC
G01S 17/32
GPHYSICS
01MEASURING; TESTING
SRADIO 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
17Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
02Systems using the reflection of electromagnetic waves other than radio waves
06Systems determining position data of a target
08for measuring distance only
32using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves
G01S 17/58
GPHYSICS
01MEASURING; TESTING
SRADIO 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
17Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
02Systems using the reflection of electromagnetic waves other than radio waves
50Systems of measurement based on relative movement of target
58Velocity or trajectory determination systems; Sense-of-movement determination systems
G01S 7/491
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
48of systems according to group G01S17/00
491Details of non-pulse systems
G01S 7/497
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
48of systems according to group G01S17/00
497Means for monitoring or calibrating
Applicants
  • 国立研究開発法人産業技術総合研究所 NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY [JP]/[JP]
Inventors
  • 土田 英実 TSUCHIDA Hidemi
Priority Data
2018-22241628.11.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL MEASUREMENT DEVICE AND MEASUREMENT METHOD
(FR) DISPOSITIF DE MESURE OPTIQUE ET PROCÉDÉ DE MESURE
(JA) 光学的測定装置及び測定方法
Abstract
(EN)
Provided are an optical measurement device and a measurement method, whereby the effect of nonlinear chirps of a laser are removed, and distance and speed can be accurately measured in FMCW lidar. This optical measurement device is provided with: a frequency-modulated laser; a photodetector; a heterodyne optical system for dividing the output light of the laser in two, one light being a probe light and the other light being a reference light, imparting a frequency shift to either the probe light or the reference light, radiating the probe light to an object, and multiplexing the reference light and the scattered light from the object and causing the multiplexed light to be incident on the photodetector; an IQ detection unit; and a computational processing unit. The IQ detection unit detects an in-phase component I and an orthogonal component Q of a beat signal generated from the photodetector, and the computational processing unit determines the phase and frequency of the beat signal from the in-phase component I and the orthogonal component Q, and executes computation for calculating the speed of the object from the frequency, and/or computation for calculating the distance to the object from the phase.
(FR)
L'invention concerne un dispositif de mesure optique et un procédé de mesure, l'effet de fluctuation non linéaire d'un laser étant éliminé, et la distance et la vitesse pouvant être mesurées avec précision dans un lidar FMCW. Ledit dispositif de mesure optique comprend : un laser modulé en fréquence ; un photodétecteur ; un système optique hétérodyne permettant de diviser la lumière de sortie du laser en deux, une lumière constituant une lumière de sonde et l'autre lumière constituant une lumière de référence, d'appliquer un décalage de fréquence à la lumière de sonde ou à la lumière de référence, de rayonner la lumière de sonde vers un objet, et de multiplexer la lumière de référence et la lumière diffusée provenant de l'objet et d'amener la lumière multiplexée à être incidente sur le photodétecteur ; une unité de détection IQ ; et une unité de traitement informatique. L'unité de détection IQ détecte une composante en phase I et une composante orthogonale Q d'un signal de battement généré à partir du photodétecteur, et l'unité de traitement informatique détermine la phase et la fréquence du signal de battement à partir de la composante en phase I et de la composante orthogonale Q, et exécute un calcul afin de calculer la vitesse de l'objet à partir de la fréquence, et/ou un calcul afin de calculer la distance jusqu'à l'objet à partir de la phase.
(JA)
FMCWライダにおいて、レーザの非線形チャープの影響を除去して、正確な距離と速度の測定を可能とする光学的測定装置及び測定方法を提供する。光学的測定装置は、周波数変調したレーザと、光検出器と、レーザの出力光を2分し、一方をプローブ光、他方を参照光とし、プローブ光又は参照光のいずれか一方に周波数シフトを与え、プローブ光を対象物に照射して、対象物からの散乱光と、参照光を合波して光検出器に入射するヘテロダイン光学系と、IQ検出部と、演算処理部とを備える。IQ検出部は、光検出器から発生するビート信号の、同相成分Iと直交成分Qを検出し、演算処理部は、同相成分Iと直交成分Qから、ビート信号の位相と周波数を求め、周波数から対象物の速度を算出する演算、又は、位相から対象物までの距離を算出する演算の少なくともいずれかを実行する。
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