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

Zhang, Chao; Set, Sze Yun; Yamashita, Shinji

doi:10.1109/tim.2020.3011768

IEEE Trans. Instrum. Meas.

2021

DOI: 10.1109/tim.2020.3011768

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

Chao Zhang

Sze Yun Set

Shinji Yamashita

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Cited by 6 publications

(1 citation statement)

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“…However, the DTSL cannot be applied for long-distance ranging applications such as frequencymodulated continuous-wave (FMCW) LiDAR [26], [27], [53]- [55], due to its relatively short coherence length of typically a few millimeters. Additionally, the inherent amplitude-modulated output which has a chirped characteristic, rendering it unsuitable for conventional amplitude-modulated continuous-wave (AMCW) LiDAR [56]- [61].…”

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Overall Non-Mechanical Spectrally Steered LiDAR Using Chirped Amplitude-Modulated Phase-Shift Method

Zhang

Shirahata

et al. 2022

J. Lightwave Technol.

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We propose and demonstrate an overall nonmechanical spectrally steered laser rangefinder using the dispersion-tuned swept laser (DTSL) and a passive diffractive element. The DTSL has no mechanical moving parts, making it possible to achieve an inertial-free high wavelength sweeping speed. The inherent intensity-modulation characteristic of the DTSL allows the modulation phase-shift method to be applied, similar to that used for an amplitude-modulated continuous-wave (AMCW) rangefinder. Since the pulse repetition rate of the DTSL is chirped, standard signal processing techniques for AMCW are not applicable. In this paper, we propose a novel chirped amplitude-modulated phase-shift (CAMPS) method with a signal processing technique to obtain the phase-shift information from a chirped amplitude-modulated signal. As a proof of concept, we demonstrated the CAMPS LiDAR with an axial ranging resolution of ~50 μm at a scanning speed of 10 kHz. I. INTRODUCTIONLaser detection and ranging (LiDAR) is a laser-based technology for distance measurement with the reflected light from the object under measurement [1], [2]. In recent years, with the advent of Industry 4.0, LiDAR that can measure the distance as well as the surface shape of the objects has attracted significant research interests as a promising technology for emerging 3D imaging applications such as autonomous driving [3]-[6], intelligent mobile robot navigation [7]-[9], and smart factory [10], [11]. Amongst the demanding requirements on the range, spatial resolution, compactness, and cost, the LiDAR beam scanner is an essential part of expanding a single-point range-finding measurement to a multi-dimensional mapping by steering the beam to the direction of interests. Most of the current LiDAR systems are based on optical elements driven by electromechanical devices, such as galvo scanners [12], polygon mirrors [13], Risley prisms [14], [15], or Microelectromechanical systems (MEMS) [16], [17]. These mechanical devices have limited steering speeds due to inertia, and are usually costly, bulky,

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confidence: 99%

Overall Non-Mechanical Spectrally Steered LiDAR Using Chirped Amplitude-Modulated Phase-Shift Method

Zhang

Shirahata

et al. 2022

J. Lightwave Technol.

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Pilot demonstration of correlation-domain LiDAR for high-speed vibration detection

et al. 2021

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Light detection and ranging (LiDAR) technology has recently been attracting considerable attention, but it is still difficult to achieve distributed reflectivity sensing and vibration detection simultaneously at high speed. To tackle this issue, we develop a new LiDAR configuration by extending fiber-optic correlation-domain reflectometry to the spatial system and demonstrate its fundamental operations. We experimentally show that the random accessibility unique to this configuration enables high-speed measurement of the vibration frequency and the position of a mirror oscillating at up to 100 kHz. This LiDAR may be applicable to visualization of flow velocity distributions, especially to distributed detection of turbulence, which induces vibration of dust particles in air.

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Analog Front-End Circuits With Input Current Attenuation and Heterodyne Techniques for Low-Cost Phase-Shift LADAR Receiver

Zheng

Guo

2021

IEEE Sensors J.

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

Cited by 6 publications

References 46 publications

Overall Non-Mechanical Spectrally Steered LiDAR Using Chirped Amplitude-Modulated Phase-Shift Method

Overall Non-Mechanical Spectrally Steered LiDAR Using Chirped Amplitude-Modulated Phase-Shift Method

Pilot demonstration of correlation-domain LiDAR for high-speed vibration detection

Analog Front-End Circuits With Input Current Attenuation and Heterodyne Techniques for Low-Cost Phase-Shift LADAR Receiver

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