调频控制的 FMCW 激光雷达使用频率到电压转换器。

Frequency Modulation Control of an FMCW LiDAR Using a Frequency-to-Voltage Converter.

机构信息

Department of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.

出版信息

Sensors (Basel). 2023 May 22;23(10):4981. doi: 10.3390/s23104981.

DOI:10.3390/s23104981

PMID:37430893

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10223902/

Abstract

An FMCW LiDAR (frequency-modulated continuous-wave light detection and ranging) is a sensor that can measure distance using optical interference frequency (fb). This sensor has recently attracted interest because it is robust to harsh environmental conditions and sunlight due to the wave properties of the laser. Theoretically, when the frequency of the reference beam is linearly modulated, a constant fb is obtained with respect to the distance. However, when the frequency of the reference beam fails to be linearly modulated, the distance measurement is not accurate. In this work, linear frequency modulation control using frequency detection is proposed to improve the distance accuracy. The FVC (frequency to voltage converting) method is used to measure fb for high-speed frequency modulation control. The experimental results show that linear frequency modulation control using an FVC improves FMCW LiDAR performance in terms of control speed and frequency accuracy.

摘要

调频连续波激光雷达（frequency-modulated continuous-wave light detection and ranging）是一种可以通过光干涉频率（fb）测量距离的传感器。由于激光的波动性，这种传感器最近因其对恶劣环境条件和阳光的稳健性而受到关注。理论上，当参考光束的频率线性调制时，相对于距离，会得到一个恒定的 fb。然而，当参考光束的频率未能线性调制时，距离测量就不准确。在这项工作中，提出了使用频率检测的线性频率调制控制，以提高距离精度。使用 FVC（频率到电压转换）方法测量 fb，以实现高速频率调制控制。实验结果表明，使用 FVC 的线性频率调制控制可提高 FMCW 激光雷达的控制速度和频率精度。