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Design of Indirect Time-of-Flight Based Lidar for Precise Three-Dimensional Measurement Under Various Reflection Conditions

Authors:
Junhwan Jang
Sungui Hwang
Kyihwan Park

Keywords: Time-of-flight, Lidar, Intensity control

Abstract:
In the indirect TOF method, the distance traveled by light can be obtained on the basis of the phase difference between the reference signal and the measured signal. To utilize the lidar as a distance measurement sensor, measuring distance, resolution, and accuracy of the lidar should be considered most importantly. Optical system of the lidar should be optimally designed since a high intensity of measured signal increases the measuring distance and accuracy. Furthermore, electronic circuit design is also considered importantly in addition to the optical system design because the varying signal of the photoelectric current for the measuring distance can cause an inaccurate result of distance measurement. Different amplitudes of the signals due to different distance and object reflectivity cause additional electronic phase delays in the demodulation circuit in addition to the phase delay corresponding to the distance to be measured because of a constant gain bandwidth product limitation. In this study, optical system design, signal processing, and intensity control method are proposed, which can be applied to the lidar to achieve high resolution and linearity performance.

Pages: 25 to 29

Copyright: Copyright (c) IARIA, 2013

Publication date: August 25, 2013

Published in: conference

ISSN: 2308-3514

ISBN: 978-1-61208-297-4

Location: Barcelona, Spain

Dates: from August 25, 2013 to August 31, 2013