公开(公告)号：US20210302577A1

公开(公告)日：2021-09-30

申请号：US16839277

申请日：2020-04-03

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyo-Hoon PARK ,  Hyeonho YOON ,  Nam-Hyun KWON ,  Kyeongjin HAN ,  Hyun-Woo RHEE ,  Geum-Bong KANG

IPC: G01S17/32 ,  G01S7/481 ,  G01S7/4913

Abstract: A silicon phased array based LiDAR device that measures a distance using a quasi-frequency modulation is disclosed. A LiDAR device according to an exemplary embodiment of the inventive concept includes a light source that generates an optical signal, an optical modulator that generates a first optical signal having a quasi-frequency whose a modulation frequency constantly varies with time by modulating a light intensity of the optical signal, an optical splitter that splits optical power of the first optical signal into a reference optical signal and a transmit (Tx) optical signal, an optical transmitter that receives and emits the Tx optical signal toward an object, an optical receiver that receives a receive (Rx) optical signal reflected from the object and transfers the Rx optical signal, an optical coupler that mixes the reference optical signal and the Rx optical signal, a balanced photodetector that detects an intermediate frequency from the optical signal transferred from the optical coupler and a distance calculator that obtains distance information by measuring the intermediate frequency.

公开(公告)号：US20210293959A1

公开(公告)日：2021-09-23

申请号：US16830869

申请日：2020-03-26

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyo-Hoon PARK ,  Hyeonho YOON ,  Nam-Hyun KWON ,  Kyeongjin HAN

IPC: G01S17/26 ,  G01S7/487 ,  G01S7/481

Abstract: A LiDAR device is disclosed that measures a distance based on self-heterodyne detection using coherence. According to an embodiment, the LiDAR device includes a light generator that generates a coherent transmission light source having a first frequency at a specific interval and delivers a time when frequency modulation into the first frequency is performed to a distance measurement circuit, an optical transmitter that delivers the transmission light source, delivered from the light generator, to an optical heterodyne detector and radiates the transmission light source to an object of the free space, an optical receiver that receives a reception light source where the transmission light source is reflected from the object, the optical heterodyne detector that outputs an electrical signal of a beat frequency based on the transmission light source delivered from the light generator and the reception light source delivered from the optical receiver, and the distance measurement circuit that measures a distance to the object based on the electrical signal of the beat frequency delivered from the optical heterodyne detector and the frequency modulation time delivered from the light generator.