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Related Concept Videos

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Related Experiment Video

Updated: Sep 28, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Video-rate high-precision time-frequency multiplexed 3D coherent ranging.

Ruobing Qian1, Kevin C Zhou1, Jingkai Zhang1

  • 1Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA.

Nature Communications
|March 30, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a high-speed Frequency-Modulated Continuous Wave (FMCW) Light Detection and Ranging (LiDAR) system for rapid 3D imaging. The new system achieves video-rate 3D imaging with submillimeter accuracy, overcoming previous speed limitations.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Robotics

Background:

  • Frequency-modulated continuous wave (FMCW) Light Detection and Ranging (LiDAR) offers high sensitivity and precision for 3D ranging.
  • Existing FMCW LiDAR systems face limitations in 3D frame rate due to digitizer bandwidth and mechanical beam steering, restricting real-time dynamic scene imaging.

Purpose of the Study:

  • To develop a high-speed FMCW-based 3D imaging system.
  • To overcome the low 3D frame rate limitations of conventional FMCW LiDAR systems.
  • To enable real-time 3D imaging of dynamic scenes with high accuracy and precision.

Main Methods:

  • Integration of a grating for beam steering with FMCW LiDAR.
  • Application of a compressed time-frequency analysis for depth retrieval.
  • Theoretical and experimental investigation of localization accuracy and precision.

Main Results:

  • Demonstration of 3D imaging for static and moving objects, including a flexing human hand.
  • Achieved submillimeter localization accuracy over a tens-of-centimeter imaging range.
  • Attained an overall depth voxel acquisition rate of 7.6 MHz, enabling video-rate 3D imaging.

Conclusions:

  • The developed high-speed FMCW LiDAR system successfully overcomes previous speed limitations.
  • The system enables densely sampled, real-time 3D imaging with high accuracy.
  • This advancement significantly broadens the application scope of FMCW LiDAR in dynamic environments.