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Large-aperture synthetic aperture imaging ladar
- Source :
- Optical Engineering. 57:1
- Publication Year :
- 2018
- Publisher :
- SPIE-Intl Soc Optical Eng, 2018.
-
Abstract
- A strip-mode side-looking large-aperture synthetic aperture imaging ladar (SAIL) based on free-space optics is designed to experimentally verify the key performances for further airborne application. The optical difficulties in the spatial domain, including optical antenna and imaging resolution for large-aperture SAIL, are considered systematically. The optical antenna consists of a circulated duplex including the tunable transmission and reception channels for the flexible wavefront control. An irradiating beam with a spatial quadratic phase-bias for the suitable and controlled phase history can be transmitted from the transmission channel, and the wavefront aberration in the reception channel resulted from the diffraction can be eliminated for the optimized heterodyne detection. The construction and 2-D imaging algorithm of the SAIL are also proposed. The performances, including wavefront, heterodyne efficiency, field of view, imaging resolution, and 2-D imaging algorithm, have been systemically verified in the short-distance of laboratory space. The well-focused 2-D SAIL imaging of a diffusely scattering target with submillimeter imaging resolution is given. The experimental results are in good agreement with the theoretical design. The results have the great significance for the future development of airborne large-aperture SAIL.
- Subjects :
- Diffraction
Heterodyne
Physics
Wavefront
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
General Engineering
Physics::Optics
Duplex (telecommunications)
Field of view
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
010309 optics
Lidar
Optics
0103 physical sciences
Heterodyne detection
0210 nano-technology
business
Image resolution
Subjects
Details
- ISSN :
- 00913286
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Optical Engineering
- Accession number :
- edsair.doi...........897738b55d893bbab01ab8204e0900fb