Chirp-pulse-compression three-dimensional lidar imager with fiber optics
Pearson, GN, Ridley, KD and Willetts, DV 2005, 'Chirp-pulse-compression three-dimensional lidar imager with fiber optics ' , Applied Optics, 44 (2) , pp. 257-265.Full text not available from this repository.
A coherent three-dimensional (angle-angle-range) lidar imager using a master-oscillator-power-amplifier concept and operating at a wavelength of 1.5 μm with chirp-pulse compression is described. A fiber-optic delay line in the local oscillator path enables a single continuous-wave semiconductor laser source with a modulated drive waveform to generate both the constant-frequency local oscillator and the frequency chirp. A portion of this chirp is gated out and amplified by a two-stage fiber amplifier. The digitized return signal was compressed by cross correlating it with a sample of the outgoing pulse. In this way a 350-ns, 10-μJ pulse with a 250-MHz frequency sweep is compressed to a width of approximately 8 ns. With a 25-mm output aperture, the lidar has been used to produce three-dimensional images of hard targets out to a range of approximately 2 km with near-diffraction-limited angular resolution and submeter range resolution.
|Themes:||Subjects / Themes > T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication (Inc. www, lidar, radio, radar, phone, TV)|
Subjects outside of the University Themes
|Schools:||Colleges and Schools > College of Science & Technology > School of the Built Environment|
|Journal or Publication Title:||Applied Optics|
|Publisher:||Optical Society of America|
|Depositing User:||H Kenna|
|Date Deposited:||09 Oct 2007 15:32|
|Last Modified:||20 Aug 2013 16:50|
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