Comprehensive ranging disambiguation for amplitude-modulated continuous-wave laser scanner

Chao Zhang; Sifan Liu; Zheyuan Zhang; Neisei Hayashi; Lei Jin; Sze Yun Set; Shinji Yamashita

doi:10.1117/12.2553482

1 April 2020 Comprehensive ranging disambiguation for amplitude-modulated continuous-wave laser scanner

Chao Zhang, Sifan Liu, Zheyuan Zhang, Neisei Hayashi, Lei Jin, Sze Yun Set, Shinji Yamashita

Proceedings Volume 11352, Optics and Photonics for Advanced Dimensional Metrology; 113521D (2020) https://doi.org/10.1117/12.2553482
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

Amplitude-modulated continuous-wave laser scanner with focusing optics can realize extremely high-precision 3D measurement. Since amplitude-modulated continuous-wave scheme employs periodical modulation, the longitudinal resolution and the maximum unambiguous range are in a trade-off. Our system utilizes dual-frequency modulation compromise such trade-off. However, such an attractive laser scanner suffers from ranging ambiguity due to aliasing, which is the systematic error inherent in amplitude-modulated continuous-wave scheme. We have removed the ranging ambiguity by aliasing synthesis. Secondly, the acquired 3D point clouds contain phase jumping at the maximum unambiguous range. With leveraging the relationship between the intensity and spatial information, the phase jumping was unwrapped to recover the spatial continuity. Thirdly, the 3D point clouds in the defocused region of the amplitude-modulated continuous-wave laser scanner distort since the depth-of-focus of focusing optics is generally cm order. The 3D point clouds in the defocused area are contaminated by aliasing which can also be regarded as a ranging ambiguity problem. We have experimentally restored the 3D point clouds by aliasing synthesis with the assistance of intensity information. The ranging area can be elongated by at least ten times of the depth-of-focus with such data processing. With the above-all mentioned configuration and data processing, we have compromised the ranging ambiguity inherent in the amplitude-modulated continuous-wave laser scanner comprehensively. We expect that our results contribute to high-precision industrial inspection for Industry 4.0.

Conference Presentation

Citation Download Citation

Chao Zhang, Sifan Liu, Zheyuan Zhang, Neisei Hayashi, Lei Jin, Sze Yun Set, and Shinji Yamashita "Comprehensive ranging disambiguation for amplitude-modulated continuous-wave laser scanner", Proc. SPIE 11352, Optics and Photonics for Advanced Dimensional Metrology, 113521D (1 April 2020); https://doi.org/10.1117/12.2553482

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available