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Gated viewing and high-accuracy three-dimensional laser radar.
Jens Busck1, Henning Heiselberg
1Electro-Optical Section, Danish Defense Research Establishment, Ryvangs Alle 1, DK-2100 Copenhagen O, Denmark. jb@ddre.dk
Applied Optics
|September 9, 2004
Summary
We developed a fast 3-D imaging laser radar system achieving sub-millimeter accuracy for many pixels in under a second. This advanced technique utilizes range-gating segmentation for high-precision 3-D imaging.
Area of Science:
- Optics and Photonics
- Imaging Technology
- Laser Systems
Background:
- Traditional 3-D imaging techniques often face limitations in speed and accuracy.
- Developing high-resolution, rapid 3-D imaging systems is crucial for various scientific and industrial applications.
Purpose of the Study:
- To present a novel, fast, and high-accuracy three-dimensional (3-D) imaging laser radar system.
- To demonstrate the effectiveness of range-gating segmentation for advanced 3-D imaging.
Main Methods:
- Utilized a picosecond Q-switched Nd:YAG laser (532 nm, 32-kHz PRF) and an ultrafast camera with a highly sensitive CCD (582 x 752 pixels).
- Employed narrow laser pulse widths (~200 ps), high pulse repetition frequency (PRF), and short camera gate times (down to 200 ps) with fine delay steps (down to 100 ps).
- Implemented range-gating segmentation combined with gated viewing and automatic gain control to suppress backscatter.
Main Results:
- Achieved better than 1-mm range accuracy for over half a million pixels in less than 1 second.
- Demonstrated rapid production of high-accuracy 3-D images.
- Successfully suppressed foreground backscatter through gated viewing with automatic gain control.
Conclusions:
- The developed laser radar system offers a significant advancement in fast and accurate 3-D imaging.
- The range-gating segmentation technique provides a robust method for high-performance 3-D data acquisition.
- Future improvements are planned to further enhance system capabilities.