논문 해외 국제전문학술지(SCI급) Verification of wide-angle beam steering based on two- dimensional translation of objective lens, and design of relay optics to improve optical performances
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-09
- 저자명 T. Kim, S. Heo, W. Kim* and N. Park**
- 학술지명 Optics & Laser Technology
- 발행처명 ELSEVIER SCI LTD
- 발행국가 해외
- 논문언어 외국어
홈페이지논문 초록 (Abstract)
Studies on light detection and ranging (LiDAR) sensors that minimize the movement of the driving unit and facilitate the realization of a wider field of view (FoV) have been actively developed. This study first confirmed possibility of a beam steering angle above 175° being achieved through the biaxial movement of the objective lens via static optical experiments using a commercial fisheye lens with an image diameter of 4 mm in an optical setup without a relay optical system. In addition, the detection possibility of a signal from an object, either a reflector or a scattering object, using the same light path as the beam steering optical path was verified. Thereafter, an attempt was made to design relay optics capable of reducing divergence angle and deviation in light transmission efficiency over the entire range of beam steering angles. The proposed design with an FoV of 170°, resulted in a reduction of the divergence angles and deviation in light transmission efficiency less than 0.05° and 1 %, respectively. Finally, using the designed optical system, a non-sequential ray-tracing-based return signal strength simulation was performed to verify the ability of the designed optics in properly detecting shape and object distance of a vehicle model placed 100 m ahead of the sensor, over the entire range of beam steering angles.