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Low-pixel-count imaging FMCW lidar
Applied Optics
|January 6, 2023
Summary
This study showcases a frequency modulated continuous wave (FMCW) lidar system capable of creating velocity and range images for targets. The fiber-bundle-based lidar achieves a 60 Hz imaging rate, demonstrating practical applications in target detection.
Area of Science:
- Optics and Photonics
- Sensing Technologies
- Lidar Systems
Background:
- Frequency Modulated Continuous Wave (FMCW) lidar offers advanced sensing capabilities.
- Fiber bundle technology enables compact and versatile lidar instrumentation.
- High-speed imaging is crucial for dynamic target tracking and analysis.
Purpose of the Study:
- To demonstrate the imaging capabilities of a novel FMCW lidar system utilizing a fiber bundle.
- To construct velocity and range images of hard targets at a high frame rate.
- To assess the practicality of a low-pixel-count lidar for enhanced scanning rates or direct imaging.
Main Methods:
- Development of an FMCW lidar system incorporating a fiber bundle.
- Implementation of custom electronics with seven parallel heterodyne receivers.
- Testing laser tuning linearity correction using a phase-locked loop.
Main Results:
- Successful construction of velocity and range images for hard targets at 60 Hz.
- Achieved a sensing range of up to 30 meters with 20 mW output power.
- Demonstrated image recovery on 6-pixel "pictures" of a spinning disk and a hovering drone.
Conclusions:
- The developed FMCW lidar system exhibits practical imaging capabilities for dynamic targets.
- The low-pixel-count system can enhance scanning rates of conventional lidars.
- Further upgrades in pixel count could enable direct target imaging applications.
