Enhancement in Dynamic Range of Amplitude-Modulated Continuous-Wave Laser Scanner Having a Coaxial Configuration

A laser scanner is a powerful tool for 3-D geometry measurement. The amplitude-modulated continuous-wave (CW) laser scanner, which benefits from high accuracy measurement operating in the intermediate range, is suitable for high-precision 3-D industrial inspection. However, due to the limited dynami...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2021, Vol.70, p.1-10
Main Authors: Zhang, Chao, Set, Sze Yun, Yamashita, Shinji
Format: Article
Language:English
Subjects:
Amplitudes
Attenuation
Automatic control
Automatic gain control
Avalanche photodiodes
Continuous wave lasers
Data loss
Dynamic range
erbium-doped fiber amplifiers (EDFAs)
gain control
High definition
Inspection
isolators
laser radar
Lasers
Measurement by laser beam
Optical attenuators
optical reflection
Optical scanners
Optical sensors
Pellicle
Photodiodes
Receivers
Scanners
shape measurement
Three dimensional models
Three-dimensional displays
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Summary:A laser scanner is a powerful tool for 3-D geometry measurement. The amplitude-modulated continuous-wave (CW) laser scanner, which benefits from high accuracy measurement operating in the intermediate range, is suitable for high-precision 3-D industrial inspection. However, due to the limited dynamic range, laser scanners suffer from data loss and deterioration. This poses challenges for 3-D modeling, conversion of 3-D point cloud data to 3-D solid data, and so on. We chose the operation wavelength in the 1530-nm region. The dynamic range of an amplitude-modulated CW laser scanner was enhanced by the implementation of a combination of a low-noise and high-gain optical preamplifier and p-i-n photodiodes, a pellicle beamsplitter, and automatic gain control using a polarization-independent high-speed variable optical attenuator based on electrooptic ceramics in the receiver. In these manners, receiver sensitivity of -72 dBm was achieved and receiver dynamic range of around 37 dB was realized. We expect that our results contribute to high-definition industrial inspection for Industry 4.0.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2020.3011768