Integrated Couplers for OAM Fiber Modes using Compact Antennas and Circular Grating

2020 ◽  
Author(s):  
Hening A. de Andrade ◽  
Julián L. Pita ◽  
Giovanni B. de Farias ◽  
Lucas H. Gabrielli
Keyword(s):  
Compact Antennas ◽  
Circular Grating ◽  
Fiber Modes

scholarly journals Biaxial 360-degree scanning LIDAR using a liquid crystal control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seiji Nishiwaki
Keyword(s):  
Liquid Crystal ◽  
Laser Light ◽  
Side Surface ◽  
Parallel Beam ◽  
Grating Couplers ◽  
Autonomous Cars ◽  
Scanning Lidar ◽  
Center Axis ◽  
Circular Grating ◽  
Segmented Electrode

AbstractSophisticated non-mechanical technology for LIDARs is needed to realize safe autonomous cars. We have confirmed the operating principle of a non-mechanical LIDAR by combining concentric circular-grating couplers (CGCs) with a coaxially aligned rod lens. Laser light incident vertically on the center of the inner CGC along the center axis of the lens is radiated from the outer CGC and passes through the side surface of the lens. It is converted to a parallel beam that scans in two axes by applying voltages to two area-segmented electrode layers sandwiching the CGCs and a liquid crystal layer formed on the CGCs. We have demonstrated scanning whose motion ranges were 360 degrees horizontally and 10° vertically. A beam with a spread angle of 0.3° × 0.8° at a minimum swept vertically up to a frequency of 100 Hz and ten equally spaced beams scanned rotationally with a 6-degree cycle variation of spread of between 0.8° and 3.5°.

Use of a phase type elongated circular grating in Talbot moiré deflectometry

Optik ◽  
2004 ◽  
Vol 115 (3) ◽  
pp. 121-128 ◽  
Author(s):  
B.J. Kim ◽  
K.C. Yuk ◽  
S.I. Lee ◽  
S. Chang
Keyword(s):  
Phase Type ◽  
Circular Grating ◽  
Moiré Deflectometry

scholarly journals Circular Grating Resonators as Small Mode-Volume Microcavities for Switching

2009 ◽  
Vol 17 (8) ◽  
pp. 5953 ◽  
Author(s):  
Sophie Schönenberger ◽  
Nikolaj Moll ◽  
Thilo Stöferle ◽  
Rainer F. Mahrt ◽  
Bert J. Offrein ◽  
...  
Keyword(s):  
Circular Grating ◽  
Mode Volume

Signal Sampling and Accuracy Analysis of Large Gear’s Angular Displacement Measuring its Deviation On-Machine

2011 ◽  
Vol 189-193 ◽  
pp. 4201-4204
Author(s):  
Jia Qi Jin ◽  
Hui Li
Keyword(s):  
Measurement Accuracy ◽  
Angular Displacement ◽  
Total Error ◽  
Measuring Method ◽  
Displacement Measurement ◽  
Signal Acquisition ◽  
Accuracy Analysis ◽  
Friction Disc ◽  
Large Gear ◽  
Circular Grating

To solve the critical problem of large gear deviation on-machine: angle displacement measurement that is how to get signal acquisition and accuracy analysis of angle displacement. A new measuring method is proposed, which applies the dividing mechanism (it is composed of friction disc and circular grating) to ensure index and pick up signal of gear corner correctly and strictly according to the principle of angular displacement measurement. Furthermore, the main error which affects measurement accuracy is analyzed, and accuracy is analyzed with geometrical theory such as Fourier series and error synthesis principle etc. The experimental results indicate that angel dividing and signal samplings are easier and more efficient by the dividing mechanism, furthermore, the accuracy is in the range of total error that is permitted by verification, and the mechanism can also meet the requirement of high accuracy, so the method is significance that assessing transmission accuracy of involutes gear.

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