Two-dimensional high-bandwidth Shack-Hartmann wavefront sensor: design guidelines and evaluation testing

2010 ◽  
Vol 49 (6) ◽  
pp. 064403 ◽  
Author(s):  
Shaddy Abado
Keyword(s):  
Design Guidelines ◽  
Wavefront Sensor ◽  
Sensor Design ◽  
Two Dimensional ◽  
High Bandwidth

scholarly journals Terahertz characterization of two-dimensional low-conductive layers enabled by metal gratings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Prashanth Gopalan ◽  
Yunshan Wang ◽  
Berardi Sensale-Rodriguez
Keyword(s):  
Optical Transmission ◽  
Terahertz Spectroscopy ◽  
Design Guidelines ◽  
Two Dimensional ◽  
Highly Sensitive ◽  
Transmission Measurements ◽  
Metal Gratings ◽  
Low Sensitivity ◽  
Non Destructive

AbstractWhile terahertz spectroscopy can provide valuable information regarding the charge transport properties in semiconductors, its application for the characterization of low-conductive two-dimensional layers, i.e., σs <  < 1 mS, remains elusive. This is primarily due to the low sensitivity of direct transmission measurements to such small sheet conductivity levels. In this work, we discuss harnessing the extraordinary optical transmission through gratings consisting of metallic stripes to characterize such low-conductive two-dimensional layers. We analyze the geometric tradeoffs in these structures and provide physical insights, ultimately leading to general design guidelines for experiments enabling non-contact, non-destructive, highly sensitive characterization of such layers.

The MAORY laser guide star wavefront sensor: design status

2018 ◽  
Author(s):  
Philippe Feautrier ◽  
Eric Stadler ◽  
Patrick Rabou ◽  
Jean-Jacques Correia ◽  
Sylvain Rochat ◽  
...  
Keyword(s):  
Wavefront Sensor ◽  
Sensor Design ◽  
Laser Guide Star ◽  
Guide Star ◽  
Laser Guide

A Two-Dimensional Model of the Fluid Dynamics of an Air Reverser

1998 ◽  
Vol 65 (1) ◽  
pp. 171-177 ◽  
Author(s):  
S. Mu¨ftu¨ ◽  
T. S. Lewis ◽  
K. A. Cole ◽  
R. C. Benson
Keyword(s):  
Design Guidelines ◽  
Dimensional Case ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Web Handling ◽  
One Dimensional ◽  
Air Supply ◽  
Two Dimensional Model ◽  
The One ◽  
The Web

A theoretical analysis of the fluid mechanics of the air cushion of the air reversers used in web-handling systems is presented. A two-dimensional model of the air flow is derived by averaging the equations of conservation of mass and momentum over the clearance between the web and the reverser. The resulting equations are Euler’s equations with nonlinear source terms representing the air supply holes in the surface of the reverser. The equations are solved analytically for the one-dimensional case and numerically for the two-dimensional case. Results are compared with an empirical formula and the one-dimensional airjet theory developed for hovercraft. Conditions that maximize the air pressure supporting the web are analyzed and design guidelines are deduced.

Analogies Between Coupled-Mode Gate Vibration and Coupled-Mode Flutter

2017 ◽  
pp. 565-592
Keyword(s):  
Design Guidelines ◽  
Frequency Mode ◽  
Suspension Bridges ◽  
Two Dimensional ◽  
Mode Instability ◽  
Dynamic Design ◽  
Coupled Mode ◽  
Dynamic Excitation ◽  
Bridge Failure ◽  
Tacoma Narrows Bridge

In this chapter the similarities between the Tacoma Narrows Bridge failure in 1940 and the Folsom Dam gate failure in 1995 are examined. In both cases, static design guidelines were followed in the design of the structure under the assumption that large, massive structures would not be susceptible to dynamic excitation. Fundamentals of two-dimensional coupled mode flutter are presented. The frequency mode coalescence that occurs in two-dimensional flutter is noted. It is seen to have some resemblance to the mode-coupling in the coupled-mode instability of Tainter gate. The need for development of dynamic design guidelines for Tainter gates is argued to be parallel to the need for dynamic design guidelines for suspension bridges in the wake of the Tacoma Narrows failure.

Compact multireference wavefront sensor design

2005 ◽  
Vol 30 (20) ◽  
pp. 2721 ◽  
Author(s):  
Alexander V. Goncharov ◽  
J. Christopher Dainty ◽  
Simone Esposito
Keyword(s):  
Wavefront Sensor ◽  
Sensor Design

Design of a High Bandwidth Non-Resonant Tertiary Motion Generator for Elliptical Vibration Texturing

2016 ◽  
Author(s):  
Keyu Chen ◽  
Ping Guo
Keyword(s):  
High Frequency ◽  
Resonant Mode ◽  
Two Dimensional ◽  
Amplification Ratio ◽  
Flexure Hinges ◽  
Element Simulation ◽  
Elliptical Vibration Texturing ◽  
High Bandwidth ◽  
Piezoelectric Stacks ◽  
Motion Generator

This paper presents the design and characteristics of a new two-dimensional non-resonant tertiary motion generator which is based on the flextensional structure. A tool holder connects two perpendicularly-placed flextensional actuators with flexure hinges which decouple the motion outputs from the two actuators. Piezoelectric stacks, which are preloaded through precision screws, are used to provide input displacements. By balancing the requirements of driving current, stiffness, and the displacement amplification ratio, the proposed design is targeted to operate at above 10 kHz with two-dimensional vibrations amplitude of 10 μm in each directions. Technical difficulties in driving a non-resonant mode piezoelectric actuator at a high frequency are discussed. The solutions and optimization procedures are presented in this paper. The design is optimized by finite element simulation; and the results are presented.

Fundamental and specific steps in Shack-Hartmann wavefront sensor design

2006 ◽  
Author(s):  
Costin Curatu ◽  
George Curatu ◽  
Jannick Rolland
Keyword(s):  
Wavefront Sensor ◽  
Sensor Design
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