Cross-diffractive optical elements for wide angle geometric camera calibration

2011 ◽  
Vol 36 (24) ◽  
pp. 4770 ◽  
Author(s):  
Simon Thibault ◽  
Aymen Arfaoui ◽  
Pierre Desaulniers
Keyword(s):  
Camera Calibration ◽  
Wide Angle ◽  
Diffractive Optical Elements ◽  
Optical Elements

scholarly journals Inverse design and demonstration of high-performance wide-angle diffractive optical elements

2020 ◽  
Vol 28 (15) ◽  
pp. 22321 ◽  
Author(s):  
Dong Cheon Kim ◽  
Andreas Hermerschmidt ◽  
Pavel Dyachenko ◽  
Toralf Scharf
Keyword(s):  
High Performance ◽  
Inverse Design ◽  
Wide Angle ◽  
Diffractive Optical Elements ◽  
Optical Elements

scholarly journals Geometrical camera calibration with diffractive optical elements

2008 ◽  
Vol 16 (25) ◽  
pp. 20241 ◽  
Author(s):  
M. Bauer ◽  
D. Grießbach ◽  
A. Hermerschmidt ◽  
S. Krüger ◽  
M. Scheele ◽  
...  
Keyword(s):  
Camera Calibration ◽  
Diffractive Optical Elements ◽  
Optical Elements

Geometrical camera calibration using lasers and diffractive optical elements

Fringe 2009 ◽  
2009 ◽  
pp. 1-4
Author(s):  
M. Bauer ◽  
D. Grießbach ◽  
A. Hermerschmidt ◽  
S. Krüger ◽  
M. Scheele ◽  
...  
Keyword(s):  
Camera Calibration ◽  
Diffractive Optical Elements ◽  
Optical Elements

scholarly journals CALIBRATING PHOTOGRAMMETRIC AIRBORNE CAMERA SYSTEMS WITH DIFFRACTIVE OPTICAL ELEMENTS

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 1637-1642
Author(s):  
D. Dahlke ◽  
M. Geßner ◽  
H. Meißner ◽  
K. Stebner ◽  
D. Grießbach ◽  
...  
Keyword(s):  
Camera Calibration ◽  
Bundle Adjustment ◽  
Test Field ◽  
Diffractive Optical Elements ◽  
Camera Model ◽  
Camera System ◽  
Time Saving ◽  
Optical Elements ◽  
Camera Systems ◽  
Calibration Methods

<p><strong>Abstract.</strong> This paper presents a laboratory approach for geometric calibration of airborne camera systems. The setup uses an incoming laser beam, which is split by Diffractive Optical Elements (DOE) into a number of beams with precisely-known propagation directions. Each point of the diffraction pattern represents a point at infinity and is invariant against translation. A single image is sufficient to allow a complete camera calibration in accordance with classical camera calibration methods using the pinhole camera model and a distortion model. The presented method is time saving, since complex bundle adjustment procedures with several images are not necessary. It is well suited for the use with frame camera systems, but it works in principle also for pushbroom scanners. In order to prove the reliability, a conventional test field calibration is compared against the presented approach, showing that all estimated camera parameters are just insignificantly different. Furthermore a test flight over the Zeche Zollern reference target has been conducted. The aerotriangulation results shows that calibrating an airborne camera system with DOE is a feasible solution.</p>

scholarly journals Frequency Division Multiplexing of Terahertz Waves Realized by Diffractive Optical Elements

2021 ◽  
Vol 11 (14) ◽  
pp. 6246
Author(s):  
Paweł Komorowski ◽  
Patrycja Czerwińska ◽  
Mateusz Kaluza ◽  
Mateusz Surma ◽  
Przemysław Zagrajek ◽  
...  
Keyword(s):  
Frequency Division Multiplexing ◽  
Diffractive Optical Elements ◽  
Frequency Division ◽  
Terahertz Waves ◽  
Optical Elements ◽  
Telecommunication Systems ◽  
Wide Range ◽  
The Future ◽  
Wireless Telecommunication ◽  
Finite Distance

Recently, one of the most commonly discussed applications of terahertz radiation is wireless telecommunication. It is believed that the future 6G systems will utilize this frequency range. Although the exact technology of future telecommunication systems is not yet known, it is certain that methods for increasing their bandwidth should be investigated in advance. In this paper, we present the diffractive optical elements for the frequency division multiplexing of terahertz waves. The structures have been designed as a combination of a binary phase grating and a converging diffractive lens. The grating allows for differentiating the frequencies, while the lens assures separation and focusing at the finite distance. Designed structures have been manufactured from polyamide PA12 using the SLS 3D printer and verified experimentally. Simulations and experimental results are shown for different focal lengths. Moreover, parallel data transmission is shown for two channels of different carrier frequencies propagating in the same optical path. The designed structure allowed for detecting both signals independently without observable crosstalk. The proposed diffractive elements can work in a wide range of terahertz and sub-terahertz frequencies, depending on the design assumptions. Therefore, they can be considered as an appealing solution, regardless of the band finally used by the future telecommunication systems.

scholarly journals Nanooptical elements for visual verification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexander Goncharsky ◽  
Anton Goncharsky ◽  
Dmitry Melnik ◽  
Svyatoslav Durlevich
Keyword(s):  
Electron Beam ◽  
Electron Beam Lithography ◽  
Mass Production ◽  
Optical Element ◽  
Visual Image ◽  
Zero Order ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Standard Equipment ◽  
Diffractive Element

AbstractThis paper focuses on the development of flat diffractive optical elements (DOEs) for protecting banknotes, documents, plastic cards, and securities against counterfeiting. A DOE is a flat diffractive element whose microrelief, when illuminated by white light, forms a visual image consisting of several symbols (digits or letters), which move across the optical element when tilted. The images formed by these elements are asymmetric with respect to the zero order. To form these images, the microrelief of a DOE must itself be asymmetric. The microrelief has a depth of ~ 0.3 microns and is shaped with an accuracy of ~ 10–15 nm using electron-beam lithography. The DOEs developed in this work are securely protected against counterfeiting and can be replicated hundreds of millions of times using standard equipment meant for the mass production of relief holograms.

scholarly journals Mobile snapshot hyperspectral imaging device for skin evaluation using diffractive optical elements

2021 ◽  
Author(s):  
Christian Kern ◽  
Uwe Speck ◽  
Rainer Riesenberg ◽  
Carina Reble ◽  
Georg Khazaka ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Imaging Device
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