Laser Feedback Frequency-Modulated Continuous-Wave LiDAR and 3-D Imaging

Wang, Yifan; Hua, Ziyu; Shi, Jia-Chen; Dai, Zongren; Wang, Jiagang; Shao, Liyang; Tan, Yidong

doi:10.1109/tim.2023.3249246

Cited by 6 publications

(5 citation statements)

References 47 publications

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“…Notably, one major constraint of current LiDAR systems lies in their echo-signal sensitivity. Demand for a new generation of industrial measurement has evolved from cooperative targets toward diffuse surface objects . Considering that the targets to be detected are typically noncooperative, efficient detection of the scattering light is imperative.…”

Section: Introductionmentioning

confidence: 99%

“…Demand for a new generation of industrial measurement has evolved from cooperative targets toward diffuse surface objects. 16 Considering that the targets to be detected are typically noncooperative, efficient detection of the scattering light is imperative. Particularly when distant objects are detected, the echo signal tends to be weak and fails to provide the needed high SNR.…”

Section: ■ Introductionmentioning

confidence: 99%

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Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

Li,

Tian,

Lin

et al. 2024

ACS Photonics

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Frequency-modulated continuous-wave laser detection and ranging (FMCW LiDAR) is a useful technology with various applications. However, numerous existing FMCW LiDAR systems are bulky, restricting their applicability in scenarios where minimizing the form factor is essential. Another major limitation is their echo-signal sensitivity. Considering that the detected targets are typically noncooperative, efficient detection of scattered light is imperative. Based on that, a microcavity Raman laser-based FMCW LiDAR is proposed combined with laser feedback technique. In the laser feedback regime, weak echo signals from targets participate in the stimulated radiation of the laser and are enhanced spontaneously when the measurement signal resonates with the laser relaxation oscillation. Without extra optical amplifiers, the laser cavity functions as an intrinsic amplifier and provides an improved signal-to-noise ratio of over 30 dB compared with conventional frequency swept interference methods. The response optical power limit can be down to 7.92 fW in the experiment. The standard deviation in 10 measurements is about 217 μm when targeting an aluminum block. By combining the proposed system with a 2-axis galvanometer scanner, 3D imaging of actual scenes can also be effectively reconstructed. This study illustrates a microcavity Raman laser-based device for conducting FMCW ranging measurements. It employs an extremely low-power near-infrared laser for detection, effectively addressing the issue of laser active detection equipment being easily detected.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

Li,

Tian,

Lin

et al. 2024

ACS Photonics

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Section: Introductionmentioning

confidence: 99%

“…Within a 5 m measurement range, the standard deviation of the measurement results was 4.64 µm. In 2022, Wang et al [21] efficiently eliminated the nonlinearity of a frequency-modulated fiber laser using equifrequency resampling techniques. They achieved a measurement standard deviation of less than 0.07 mm at an output power below 1 mW for distances up to 152 m. It can be observed that the current ranging systems using FSI still face challenges such as bulky interference optical paths composed of lens systems, inconvenience in portability, the need for improvement in measurement accuracy, and high costs.…”

Section: Introductionmentioning

confidence: 99%

Research on Fiber-Optic Optical Coherence Ranging System Based on Laser Frequency Scanning Interferometry

Zhou,

Yuan,

2024

Sensors

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In this paper, a system for absolute distance measurement is proposed based on laser frequency scanning interferometry (FSI). The system utilizes a digitally tunable laser as the light source and employs synchronized pulses to drive an analog-to-digital converter (ADC) for interference signal acquisition. The frequency domain demodulation for absolute distance measurement is achieved through a three-spectrum line interpolation method based on the Hanning window. The system takes advantage of the spatial filtering characteristics of a single-mode optical fiber and the diffuse reflection properties of light to achieve a high integration of the prism system that forms the interference optical path. The resulting integrated fiber-optic probe is capable of measuring the distance to a non-cooperative target even when oriented at a certain angle with the target. We designed and fabricated a portable prototype. Experimental validation demonstrated that the maximum measurement distance of the system is 73.51 mm with a standard deviation of less than 0.19 μm for optimal measurement results. Even when there is an offset angle, the system maintains good measurement repeatability.

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“…The current mainstream solution for autonomous driving is to use Lidar and vision cameras for fusion [3], Lidar (Light Detection And Ranging) which is short for Lidar. The main Lidar ranging principles are: time-offlight (TOF) method [4], laser triangulation [5], and continuous wave frequency modulation (FMCW) [6], which is a noncontact active ranging sensor [7] [8]. Vision cameras can be further divided into monocular cameras, binocular cameras [39], and depth cameras [10].…”

Section: Introductionmentioning

confidence: 99%

LIDAR and camera fusion method based on detection frame overlap

Wu,

Ding

2023

International Conference on Automation Control, Algorithm, and Intelligent Bionics (ACAIB 2023)

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The target detection by fusion of LiDAR and camera can effectively improve the accuracy of target detection and recognition. The current fusion algorithm mainly stays in feature-level fusion, and the real-time performance is poor to be deployed in mobile, this paper proposes a target-level fusion scheme to fuse the target frames detected by two sensors based on the overlap, and the experiments show that the method can effectively improve the detection rate and classification correct rate.

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Laser Feedback Frequency-Modulated Continuous-Wave LiDAR and 3-D Imaging

Cited by 6 publications

References 47 publications

Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

Research on Fiber-Optic Optical Coherence Ranging System Based on Laser Frequency Scanning Interferometry

LIDAR and camera fusion method based on detection frame overlap

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