빔 확산각 최소화를 통한 장거리 측정용 ToF 레이저 거리센서 광학계 설계 연구

Abstract

In this paper, a study is conducted on the design of an optical system of a time-of-flight (TOF) laser distance sensor that can measure long distancesby minimizing beam divergence. When measuring a long distance, the amount of light on the object’s surface decreases as the distance increases, dueto the diffusion angle of the laser beam, and thus the beam at the sensor also decreases, causing measurement errors. In general, a cylindrical lens isused to reduce the divergence beam angle. However, an optical system using a cylindrical lens has the problem of degraded performance due to thedifficulty with assembly tolerance, as well as the problem of the increased size of the optical system, and thus the use of aspherical lenses has been increasing recently. Therefore, in this study, the optical efficiencies and assembly tolerances of optical systems using respectively a cylindrical lensand an aspherical lens are compared and analyzed.