For frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR), which is long-distance 4D measurement technology, fast Fourier transform (FFT) is necessary which requires high-performance computing devices. As the measurement target moves away, the measurable distance is limited by the increased beat frequency and coherence length of the light source. In this study, time-domain coherent LiDAR system was designed using chirped fiber Bragg grating (CFBG) at the reference arm. The proposed technology can measure distance without FFT and regardless of the coherence length of the light source. We acquired distance information and 3D images of targets over 10 meters.
KEYWORDS: LIDAR, Solid state electronics, Relays, Scanners, Solid state physics, Solid state lasers, Acousto-optics, 3D image processing, Wavelength tuning, Robotics
FMCW LiDAR is an optical measurement technology that is drawing attention in various industries. For 3D FMCW imaging, a proper beam scanning process is required. Since conventional mechanical beam scanners have limits in automotive FMCW LiDAR, active researches on solid-state beam scanners are ongoing. Despite advantages of solid-state beam scanners, there is a disadvantage in field of view (FOV) with current solid-state scanners. In this study, we conducted studies on extending the FOV of the solid-state FMCW LiDAR system. By applying a relay optical system, we achieved an extension in FOV of our system and 3D FMCW images are obtained.
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