Contributed Review: Advanced three-dimensional laser radar imaging with the airborne optical systems testbed

2018 ◽  
Vol 89 (10) ◽  
pp. 101502 ◽  
Author(s):  
Marius A. Albota ◽  
Rajan Gurjar ◽  
Anthony Mangognia ◽  
Daniel Dumanis ◽  
Brendan Edwards
Keyword(s):  
Three Dimensional ◽  
Radar Imaging ◽  
Optical Systems ◽  
Laser Radar

Atomic Resolution in Crystal Aperture Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 236-237
Author(s):  
J T Fourie
Keyword(s):  
Optical System ◽  
Spherical Aberration ◽  
Three Dimensional ◽  
Transmission Function ◽  
Optical Systems ◽  
Bragg Angle ◽  
Electron Optical System ◽  
Intimate Contact ◽  
Diffraction Effects ◽  
Design Aspect

The attempts at improvement of electron optical systems to date, have largely been directed towards the design aspect of magnetic lenses and towards the establishment of ideal lens combinations. In the present work the emphasis has been placed on the utilization of a unique three-dimensional crystal objective aperture within a standard electron optical system with the aim to reduce the spherical aberration without introducing diffraction effects. A brief summary of this work together with a description of results obtained recently, will be given.The concept of utilizing a crystal as aperture in an electron optical system was introduced by Fourie who employed a {111} crystal foil as a collector aperture, by mounting the sample directly on top of the foil and in intimate contact with the foil. In the present work the sample was mounted on the bottom of the foil so that the crystal would function as an objective or probe forming aperture. The transmission function of such a crystal aperture depends on the thickness, t, and the orientation of the foil. The expression for calculating the transmission function was derived by Hashimoto, Howie and Whelan on the basis of the electron equivalent of the Borrmann anomalous absorption effect in crystals. In Fig. 1 the functions for a g220 diffraction vector and t = 0.53 and 1.0 μm are shown. Here n= Θ‒ΘB, where Θ is the angle between the incident ray and the (hkl) planes, and ΘB is the Bragg angle.

Handheld Laser Scanner Research

2019 ◽  
Vol 952 (10) ◽  
pp. 47-54
Author(s):  
A.V. Komissarov ◽  
A.V. Remizov ◽  
M.M. Shlyakhova ◽  
K.K. Yambaev
Keyword(s):  
Point Cloud ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Test Site ◽  
Optical Systems ◽  
Advantages And Disadvantages ◽  
Site Survey ◽  
Laser Scanners ◽  
Three Dimensional Models ◽  
The Stability

The authors consider hand-held laser scanners, as a new photogrammetric tool for obtaining three-dimensional models of objects. The principle of their work and the newest optical systems based on various sensors measuring the depth of space are described in detail. The method of simultaneous navigation and mapping (SLAM) used for combining single scans into point cloud is outlined. The formulated tasks and methods for performing studies of the DotProduct (USA) hand-held laser scanner DPI?8X based on a test site survey are presented. The accuracy requirements for determining the coordinates of polygon points are given. The essence of the performed experimental research of the DPI?8X scanner is described, including scanning of a test object at various scanner distances, shooting a test polygon from various scanner positions and building point cloud, repeatedly shooting the same area of the polygon to check the stability of the scanner. The data on the assessment of accuracy and analysis of research results are given. Fields of applying hand-held laser scanners, their advantages and disadvantages are identified.

Low-cost laser radar imaging experiments

1992 ◽  
Author(s):  
Robert F. Dillon ◽  
Donald P. DeGloria ◽  
Frank M. Pagliughi ◽  
Jeffrey T. Muller ◽  
Michael G. Cheifetz ◽  
...  
Keyword(s):  
Low Cost ◽  
Radar Imaging ◽  
Laser Radar

Model of Moving Target Trajectory Detected Based on Airborne Laser Radar Imaging

2015 ◽  
Vol 52 (10) ◽  
pp. 101002
Author(s):  
寇添 Kou Tian ◽  
王海晏 Wang Haiyan ◽  
王芳 Wang Fang ◽  
吴学铭 Wu Xueming ◽  
王领 Wang Ling ◽  
...  
Keyword(s):  
Radar Imaging ◽  
Laser Radar ◽  
Moving Target ◽  
Target Trajectory ◽  
Airborne Laser

scholarly journals Correlation-matching multipath suppression algorithm in three-dimensional through-wall radar imaging

2019 ◽  
Vol 2019 (21) ◽  
pp. 7444-7448
Author(s):  
Cao Lingxiao ◽  
Cui Guolong ◽  
Song Yilin ◽  
Guo Shisheng ◽  
Kong Lingjiang
Keyword(s):  
Three Dimensional ◽  
Radar Imaging ◽  
Correlation Matching
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