Removal of systematic distance error due to correlated stray light in laser scanning-based AMCW time-of-flight sensor

Wook Hyeon Kwon; Sung Hyun Lee; Yoon Seop Lim; Yong Hwa Park

doi:10.1117/12.2609458

1 March 2022 Removal of systematic distance error due to correlated stray light in laser scanning-based AMCW time-of-flight sensor

Wook Hyeon Kwon, Sung Hyun Lee, Yoon Seop Lim, Yong Hwa Park

Author Affiliations +

Proceedings Volume 12013, MOEMS and Miniaturized Systems XXI; 120130I (2022) https://doi.org/10.1117/12.2609458
Event: SPIE OPTO, 2022, San Francisco, California, United States

Conference Poster

Abstract

With the increasing demand for 3D depth information in various industrial applications, light detection and ranging (LiDAR) has been emerged as one of the solutions to measure the distance of objects. However, existing AMCW-based indirect ToF sensors have problems with measurement accuracy since the measured depth is sensitive to unwanted error sources such as ambient light, wide-band random noises, and stray light. In this paper, the effects of such stray light i.e. systematic error source are thoroughly analyzed in a cause-and-effect manner in terms of the signal’s amplitude and measured phase changes. Furthermore, a pre-compensation method to remove the effects of stray light is validated under various practical experimental conditions. According to the experimental results, the proposed pre-compensation method improves the measurement accuracy with mm-level depth error.

Conference Presentation

Citation Download Citation

Wook Hyeon Kwon, Sung Hyun Lee, Yoon Seop Lim, and Yong Hwa Park "Removal of systematic distance error due to correlated stray light in laser scanning-based AMCW time-of-flight sensor", Proc. SPIE 12013, MOEMS and Miniaturized Systems XXI, 120130I (1 March 2022); https://doi.org/10.1117/12.2609458

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