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1. WO2022115250 - ACTIVE TEMPERATURE CONTROL FOR REDUCING BACKGROUND NOISE IN A LIDAR SYSTEM

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Publication Number WO/2022/115250
Publication Date 02.06.2022
International Application No. PCT/US2021/059163
International Filing Date 12.11.2021
IPC
G01S 7/497 2006.1
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
G01S 7/481 2006.1
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
481Constructional features, e.g. arrangements of optical elements
H01S 5/183 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
5Semiconductor lasers
10Construction or shape of the optical resonator
18Surface-emitting lasers
183having a vertical cavity
H01L 23/38 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
23Details of semiconductor or other solid state devices
34Arrangements for cooling, heating, ventilating or temperature compensation
38Cooling arrangements using the Peltier effect
CPC
F25B 21/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
21Machines, plant, or systems, using electric or magnetic effects
02using Peltier effect; using Nernst-Ettinghausen effect
F25B 2321/021
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2321Details of machines, plants, or systems, using electric or magnetic effects
02using Peltier effects; using Nernst-Ettinghausen effects
021Control thereof
F25B 2321/0212
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2321Details of machines, plants, or systems, using electric or magnetic effects
02using Peltier effects; using Nernst-Ettinghausen effects
021Control thereof
0212of electric power, current or voltage
F25B 2321/023
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2321Details of machines, plants, or systems, using electric or magnetic effects
02using Peltier effects; using Nernst-Ettinghausen effects
023Mounting details thereof
G01S 17/10
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
10using transmission of interrupted, pulse-modulated waves
G01S 17/89
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
88Lidar systems specially adapted for specific applications
89for mapping or imaging
Applicants
  • BEIJING VOYAGER TECHNOLOGY CO., LTD. [CN]/[CN]
  • YEH, Yu-Ching [US]/[US]
Inventors
  • YEH, Yu-Ching
  • LU, Yue
  • WANG, Youmin
Agents
  • EUREK, Justin
Priority Data
17/103,64624.11.2020US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) ACTIVE TEMPERATURE CONTROL FOR REDUCING BACKGROUND NOISE IN A LIDAR SYSTEM
(FR) RÉGULATION ACTIVE DE TEMPÉRATURE POUR RÉDUIRE LE BRUIT DE FOND D'UN SYSTÈME LIDAR
front page image
Abstract
(EN) An active temperature controlled laser for a LiDAR system is provided. The laser is heated to a minimum target temperature to narrow the ambient temperature range of operation. The heating can be done by a thermoelectric cooler (TEC) or a separate heating element, such as a heating resistor(s). The heater is deactivated when the temperature sensor reports an environment temperature greater than the minimum target temperature. In addition, a TEC controller is coupled to the TEC, and is configured to control the TEC so that the temperature output of the temperature measurement device stays within a designated temperature range. This limits temperature-induced variations in the wavelength of the laser beam to within a designated wavelength range, allowing the use of a narrow band pass filter to reduce environmental light noise and improve the signal-to-noise ratio of the detected signal.
(FR) L'invention concerne un laser actif à température régulée destiné à un système LiDAR. Le laser est chauffé à une température cible minimale pour réduire la plage ambiante de températures de fonctionnement. Le chauffage peut être réalisé par un refroidisseur thermoélectrique (TEC) ou par un élément chauffant séparé, tel qu'une ou plusieurs résistance(s) chauffante(s). Le dispositif de chauffage est désactivé lorsque le capteur de températures signale le dépassement de la température cible minimale par la température ambiante. De plus, un régulateur de TEC est couplé au TEC et conçu pour que, par régulation du TEC, la transmission de températures du dispositif de mesure de températures reste dans une plage désignée de températures. Cela limite les variations induites par les températures dans la longueur d'onde du faisceau laser à une plage désignée de longueurs d'onde, ce qui permet l'utilisation d'un filtre passe-bande étroit, pour réduire le bruit de lumière ambiante et pour améliorer le rapport signal sur bruit du signal détecté.
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