Journal ArticleDOI
Antenna parameters for incoherent backscatter heterodyne lidar
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The antenna and beam geometry of lidar systems employing heterodyne reception of incoherent backscatter signals are discussed, with particular emphasis on systems where the target extends uniformly across the transmitted beam using topographic targets or atmosphericBackscatter.Abstract:
The antenna and beam geometry of lidar systems employing heterodyne reception of incoherent backscatter signals are discussed. Particular emphasis is placed on systems where the target extends uniformly across the transmitted beam using topographic targets or atmospheric backscatter. The geometry is assumed to be circularly symmetrical, but otherwise arbitrary obscurations are permitted. The effects of atmospheric scintillation are neglected. Parameters are defined which characterize the system efficiency, and the conditions under which these parameters may be maximized are considered.read more
Citations
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Journal ArticleDOI
Coherent laser radar performance for general atmospheric refractive turbulence.
Rod Frehlich,Michael J. Kavaya +1 more
TL;DR: The signal-to-noise ratio (SNR) and heterodyne efficiency are investigated for coherent (heterodyne detection) laser radar under the Fresnel approximation and general conditions and the effects of atmospheric refractive turbulence are included by using the path-integral formulation.
Journal ArticleDOI
A Method for Estimating the Turbulent Kinetic Energy Dissipation Rate from a Vertically Pointing Doppler Lidar, and Independent Evaluation from Balloon-Borne In Situ Measurements
Ewan O'Connor,Ewan O'Connor,Anthony J. Illingworth,Ian M. Brooks,Chris Westbrook,Robin J. Hogan,Fay Davies,Barbara Brooks +7 more
TL;DR: In this paper, a method of estimating dissipation rates from a vertically pointing Doppler lidar with high temporal and spatial resolution has been evaluated by comparison with independent measurements derived from a balloon-borne sonic anemometer.
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Fiber coupling efficiency for random light and its applications to lidar
Peter J. Winzer,Walter R. Leeb +1 more
TL;DR: A specialization to the emerging fields of both incoherent and coherent fiber-based lidar applications shows that a maximum coupling efficiency of approximately 42% can be obtained for a monostatic system.
Journal ArticleDOI
Coherent Doppler lidar for measurements of wind fields
R.T. Menzies,R. M. Hardesty +1 more
TL;DR: The capability of coherent Doppler lidars for mapping wind fields over selected regions in the lower atmosphere and greatly enhancing the capability to visualize flow patterns in real time is discussed in this article.
Journal Article
The concept of degree of coherence and its application to optical problems
TL;DR: In this article, the maximum visibility of the interferences obtainable from two points in a wave field is defined as their degree of coherence γ, which depends only on the aperture of the illuminating cone.
References
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Journal ArticleDOI
Coherence Properties of Optical Fields
Leonard Mandel,Emil Wolf +1 more
TL;DR: In this paper, a review of coherence properties of electromagnetic fields and their measurements, with special emphasis on the optical region of the spectrum, is presented, based on both the classical and quantum theories.
The Coherence Properties of Optical Fields
TL;DR: In this paper, a review of coherence properties of electromagnetic fields and their measurements, with special emphasis on the optical region of the spectrum, is presented, based on both the classical and quantum theories.
Journal ArticleDOI
The concept of degree of coherence and its application to optical problems
TL;DR: In this article, the maximum visibility of the interferences obtainable from two points in a wave field is defined as their degree of coherence γ, which depends only on the aperture of the illuminating cone.
Journal ArticleDOI
Optical heterodyne detection of an atmospherically distorted signal wave front
TL;DR: In this article, the effect of atmospheric distortion on the performance of an optical heterodyne detection system is examined theoretically and an exact expression relating the distortion to the detector signal-to-noise ratio is derived.
Journal ArticleDOI
Some effects of target-induced scintillation on optical radar performance
TL;DR: In this paper, the statistical performance of pulsed optical radars that use energy detection is considered, and the physical factors influencing the number of observed correlation cells for the cases of partial and total interception of the transmitted beam are examined.
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