Active optics and control architecture for a giant segmented mirror telescope

2003 ◽  
Author(s):  
George Z. Angeli ◽  
Myung K. Cho ◽  
Mark S. Whorton
Keyword(s):  
Control Architecture ◽  
Active Optics ◽  
Segmented Mirror ◽  
And Control ◽  
Mirror Telescope

scholarly journals A Tip–Tilt and Piston Detection Approach for Segmented Telescopes

Photonics ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 3
Author(s):  
Shun Qin ◽  
Wai Kin Chan
Keyword(s):  
Error Detection ◽  
Phase Retrieval ◽  
Dynamic Range ◽  
Detection Accuracy ◽  
Wavefront Sensing ◽  
Next Generation ◽  
Large Aperture ◽  
Detection Approach ◽  
Segmented Mirror ◽  
And Control

Accurate segmented mirror wavefront sensing and control is essential for next-generation large aperture telescope system design. In this paper, a direct tip–tilt and piston error detection technique based on model-based phase retrieval with multiple defocused images is proposed for segmented mirror wavefront sensing. In our technique, the tip–tilt and piston error are represented by a basis consisting of three basic plane functions with respect to the x, y, and z axis so that they can be parameterized by the coefficients of these bases; the coefficients then are solved by a non-linear optimization method with the defocus multi-images. Simulation results show that the proposed technique is capable of measuring high dynamic range wavefront error reaching 7λ, while resulting in high detection accuracy. The algorithm is demonstrated as robust to noise by introducing phase parameterization. In comparison, the proposed tip–tilt and piston error detection approach is much easier to implement than many existing methods, which usually introduce extra sensors and devices, as it is a technique based on multiple images. These characteristics make it promising for the application of wavefront sensing and control in next-generation large aperture telescopes.

Co phasing Experiment of Active Optics for Segmented Mirror

2018 ◽  
Vol 47 (2) ◽  
pp. 212003
Author(s):  
李斌 LI Bin ◽  
吴建 WU Jian ◽  
刘燕德 LIU Yan de ◽  
谢锋云 XIE Feng yun ◽  
陈莫 CHEN Mo ◽  
...  
Keyword(s):  
Active Optics ◽  
Segmented Mirror

A Plug-and-Play Monitoring and Control Architecture for Disturbance Compensation in Rolling Mills

2018 ◽  
Vol 23 (1) ◽  
pp. 200-210 ◽  
Author(s):  
Hao Luo ◽  
Xu Yang ◽  
Minjia Krueger ◽  
Steven X. Ding ◽  
Kaixiang Peng
Keyword(s):  
Control Architecture ◽  
Disturbance Compensation ◽  
Monitoring And Control ◽  
Plug And Play ◽  
Rolling Mills ◽  
And Control

Industrial Verification of Piezo Motors on a CubeSat Based Verification Platform

2006 ◽  
Author(s):  
Manuel Czech ◽  
Ulrich Walter
Keyword(s):  
Complex Systems ◽  
Low Complexity ◽  
Micro Electro Mechanical System ◽  
Mission Design ◽  
Technology Readiness ◽  
Key Technology ◽  
Mems Technology ◽  
Segmented Mirror ◽  
Mirror Telescope

Due to the classification of technologies in NASA’s and ESA’s technology readiness levels, newly developed components have to be space proven before they can be utilized in space missions. This space prove can be adduced by sending these technologies to orbit either as experiment on a piggyback flight or a dedicated mission. Over the last years the size of technologies and satellites has shifted to much smaller sizes. In this paper, the possibility of industrial verification of MEMS (Micro Electro Mechanical System) applications using dedicated pico-satellite missions is examined. Based on the CubeSat concept, a technology verification platform can be realized for verification of not only pico-satellite components, but also of components of complex systems and missions. Therefore a platform fulfilling the requirements for such industrial verification of components named MOVE (Munich Orbital Verification Experiment) is developed at the Institute of Astronautics (LRT). This platform enables professional verification of MEMS technology and techniques at overall mission costs of less than 100k€. As a first application of this approach, a mission called π-MOVE (π for piezo) will verify piezo motors on the developed platform. These piezo motors are representative for components of complex systems, as this motor concept is considered to be key technology for future segmented mirror telescope missions. In the mission design process for this platform, strong emphasis is put on the robustness of the design, low complexity and realizability within the institute’s environment. The advantages through access to both university and industry resources will be taken. The feasibility of professional technology verification is highly dependent on the test plans, which are developed in cooperation with the experienced industrial partners.

HLPR Chair: A Novel Indoor Mobility-Assist and Lift System

2007 ◽  
Author(s):  
Roger Bostelman ◽  
James Albus ◽  
Tommy Chang ◽  
Tsai Hong ◽  
Sunil K. Agrawal ◽  
...  
Keyword(s):  
Trajectory Planning ◽  
Control Architecture ◽  
Back Injury ◽  
Patient Mobility ◽  
Wheelchair Users ◽  
Planning And Control ◽  
Autonomous Planning ◽  
Autonomous Mobility ◽  
Mobility Device ◽  
And Control

This paper describes a novel Home Lift, Position, and Rehabilitation (HLPR) Chair, designed at National Institute of Standards and Technology (NIST), to provide independent patient mobility for indoor tasks, such as moving to and placing a person on a toilet or bed, and lift assistance for tasks, such as accessing kitchen or other tall shelves. These functionalities are currently out of reach of most wheelchair users. One of the design motivations of the HLPR Chair is to reduce back injury, typically, an important issue in the care of this group. The HLPR Chair is currently being extended to be an autonomous mobility device to assist cognition by route and trajectory planning. This paper describes the design of HLPR Chair, its control architecture, and algorithms for autonomous planning and control using its unique kinematics.

Integration of a Signal Processing and Control ASIC With the JPL Micro-Gyroscope

2002 ◽  
Author(s):  
Yen-Cheng Chen ◽  
Robert M’Closkey ◽  
Tuan Tran ◽  
Brent Blaes
Keyword(s):  
Signal Processing ◽  
Experimental Results ◽  
Control Architecture ◽  
Flexible Control ◽  
Rate Sensor ◽  
And Control ◽  
Flexible Control Architecture

This paper describes the integration of a vibratory rate sensor—the JPL microgyro—with a special purpose control ASIC developed at UCLA. The digital ASIC has a flexible control architecture that can be customized for individual sensors. We describe this process for one sensor prototype and include experimental results demonstrating the efficacy of the ASIC.

Design, development, and validation of a segment support actuator for the prototype segmented mirror telescope

2018 ◽  
Vol 4 (01) ◽  
pp. 1
Author(s):  
Prasanna Gajanan Deshmukh ◽  
Amaresh Mandal ◽  
Padmakar S. Parihar ◽  
Dayananda Nayak ◽  
Deepta Sundar Mishra
Keyword(s):  
Design Development ◽  
Segmented Mirror ◽  
Development And Validation ◽  
Mirror Telescope
Sign in / Sign up

Export Citation Format

Share Document