A model-based design allows representing complex, multi-domain systems as interconnected functional blocks, yielding graphical, intuitive information about the overall project, besides simplifying simulation. This work proposes using the modular approach as an optical engineering design and educational tool for developing paraxial ray optics setups, providing further integration with mechatronics subsystems and control loops. An expanded version of the ABCD transfer matrix modeling is implemented in MATLAB Simulink environment to simultaneously perform ray tracing and dynamic simulations. The methodology is validated for different problems, including paraxial cloaking, transmission through a multimode optical fiber, a Fabry–Perot interferometer, and an optical pickup with automatic focus, yielding reliable results with prospective applications in optical engineering design and for creating virtual labs devoted to multiphysics and mechatronics engineering courses.

Model-Based Design and Simulation of Paraxial Ray Optics Systems

A large, segmented space telescope requires high precision and accuracy in its mirror shape to obtain clear images. The Structures, Propulsion, and Control Engineering (SPACE) telescope testbed at the NASA sponsored University Research Center must maintain a pointing control accuracy of 2 arc seconds. A Peripheral Pointing Architecture (PPA) has been designed to demonstrate the testbed pointing accuracy. A finite element model of the PPA is developed. Normal mode analysis is performed to establish the PPA's natural frequencies, mode shapes, mass and stiffness matrices. Utilizing H-infinity controllers developed for figure maintenance, the pointing control of the testbed structure is achieved.

An actuated platform FEA model used for precision pointing control

A large order flexible space structure, such as a segmented reflector space telescope, requires a high degree of precision and accuracy in order to maintain its nominal shape in order to form clear images. The tracking control for the pointing of such a large complex multiple-input multiple-output (MIMO) system requires a robust controller to maintain the telescope pointing accurately and reliably at it's target. The segmented space telescope testbed at the Structures, Propulsion, And Controls Engineering (SPACE) NASA University Research Center (URC) of Excellence at California State University, Los Angeles, utilizes a segmented primary mirror and a novel motorized laser platform for simulating the testbed's intended target and demonstrating the testbed's pointing accuracy. The motorized platform along with two sets of accessory mirrors comprises a Peripheral Pointing Architecture (PPA). In order to design a suitable controller, the highly nonlinear geometric model describing the laser paths from source to optical detector plane was linearized to produce an LTI state-space model for controller design.

Linearization of a nonlinear geometric system model for robust controller design

A large, segmented space telescope requires high precision and accuracy in its mirror shape to obtain clear images. The Structures, Propulsion, and Control Engineering (SPACE) telescope testbed at the NASA sponsored University Research Center of excellence must maintain a pointing control accuracy of 2 arc seconds. A Peripheral Pointing Architecture (PPA) has been designed to demonstrate the Testbed’s pointing accuracy. A Finite Element Analysis (FEA) model of the PPA is developed. Normal mode analysis is performed to establish the PPA’s natural frequencies, mode shapes, and the mass and stiffness matrices. Utilizing the H-infinity controllers developed to achieve figure maintenance, the pointing control of the Testbed structure is achieved.

Mechanical Modeling of an Actuated Platform for Precision Pointing Control - Via Finite-element Analysis and Normal Mode Analysis

Mechanical Modeling of an Actuated Platform for Precision Pointing Control - Via Finite-element Analysis and Normal Mode Analysis.

For deep space exploration, it is important for telescopes to have a high accuracy and precision in pointing at objects far in space. In addition, a large segmented space telescope requires high precision and accuracy in mirror shape. The Segmented Space Telescope Testbed at the Structures, Propulsion, and Control Engineering (SPACE) Laboratory at California State University, Los Angeles utilizes segmented mirror panels to mimic a parabolic mirror and a series of lasers and mirrors to demonstrate pointing control. This paper discusses a LabVIEW based visualization that is used for pointing simulation of the SPACE Testbed. The Visualization allows for simulation of the physical Precision Pointing Architecture (PPA) that allows for visual verification of pointing control.

Ray tracing visualization using LabVIEW for Precision Pointing Architecture of a segmented reflector testbed

A large, segmented space telescope requires high precision and accuracy in its mirror shape to obtain clear images. In order for control of such complex structures to be achieved to high precision and accuracy, it is important for sensing equipment involved in shape control to be constantly checked for deviations from their required calibration. The Segmented Space Telescope Testbed at the Structures, Propulsion, and Control Engineering (SPACE) Laboratory at California State University, Los Angeles, utilizes segmented mirror panels and a network of 42 sensors to mimic a monolithic paraboloid mirror shape to high accuracy and precision. For such a high precision system, regular checking of sensor calibration is crucial to performance. This paper describes a LabVIEW — based visualization subsystem that has been implemented and used for sensor calibration of the SPACE Testbed. The subsystem allows for linearity check for each sensor. In addition, the visualization subsystem provides a real-time means of system monitoring. The visualization also reduces the time to check all 42 sensors while at the same time improve the precision and accuracy of the measurements. By reducing the time required, it is easier to verify sensor linearity at regular interval.

LabVIEW calibration linearity visualization for precision sensors used in shaping control of a segmented reflector test bed

A large, segmented space telescope requires high precision and accuracy in its mirror shape to obtain clear images. In order for control of such complex structures to be achieved to high precision and accuracy, it is important for sensing equipment involved in shape control to be constantly checked for deviations from their required calibration. The Segmented Space Telescope Testbed at the Structures, Propulsion, and Control Engineering (SPACE) Laboratory at California State University, Los Angeles, utilizes segmented mirror panels and a network of 42 sensors to mimic a monolithic paraboloid mirror shape to high accuracy and precision. For such a high precision system, regular checking of sensor calibration is crucial to performance.

This paper describes a LabVIEW based visualization subsystem that has been implemented and used for sensor calibration of the SPACE Testbed. The subsystem allows for linearity check for each sensor. In addition, the visualization subsystem provides a real-time means of system monitoring. The visualization also reduces the time to check all 42 sensors while at the same time improve the precision and accuracy of the measurements. By reducing the time required, it is easier to verify sensor linearity at regular interval.

http://www.wseas.us/e-library/conferences/2011/Mexico/CISST/CISST-13.pdf

LabVIEW visualization for inductive sensors used in shaping control of a segmented reflector test bed

For deep space exploration, it is important for telescopes to have a high accuracy and precision in pointing at objects far in space. In addition, a large segmented space telescope requires high precision and accuracy in mirror shape. The Segmented Space Telescope Testbed at the Structures, Propulsion, and Control Engineering (SPACE) Laboratory at California State University, Los Angeles utilizes segmented mirror panels to mimic a parabolic mirror and a series of lasers and mirror to demonstrate pointing control.

This paper discusses a LabVIEW based visualization that is used for pointing simulation of the SPACE Testbed. The Visualizations allows for simulation of the physical Precision Pointing Architecture (PPA). This allows for visual verification of pointing control.

http://www.wseas.us/e-library/conferences/2011/Mexico/CISST/CISST-14.pdf

Ray tracing visualization for precision pointing architecture of a segmented reflector testbed using LabVIEW

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Ray tracing visualization using LabVIEW for Precision Pointing Architecture of a segmented reflector testbed

LabVIEW calibration linearity visualization for precision sensors used in shaping control of a segmented reflector test bed

LabVIEW visualization for inductive sensors used in shaping control of a segmented reflector test bed

Ray tracing visualization for precision pointing architecture of a segmented reflector testbed using LabVIEW