Integrated modeling tools for large ground-based optical telescopes

Optical system modeling is interdisciplinary by its very nature. Optics, thermal engineering, structural engineering, control systems, electrical engineering, and data analysis are among the disciplines required to perform such modeling. Each discipline tends to have various software tools at its disposal to perform the required design and analysis but the software tools have had only limited ability for interdisciplinary use. Optical design software can form the core for optical systems modeling in many instances but its capabilities must be extended, or it needs to be used in a nontraditional way, depending on the problem at hand. We have used optical design software to assist in or form the basis for solving a number of interdisciplinary optical systems modeling problems. As an example, we present our method of dynamic optical ray tracing here and show its application. We also mention an example of linking optical design software to external code to solve optical systems modeling problems. Although these modeling efforts were successful, they illustrate the associated difficulty and need for integrated software modeling tools.

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“…An integrated modeling effort that does use "live links" to optical ray tracing code has been reported by Angeli et al 12 .…”

Section: Integrated Modeling Effortsmentioning

confidence: 99%

Toward end-to-end optical system modeling and optimization: a step forward in optical design

Crowther

Wassom

2004

Novel Optical Systems Design and Optimization VII

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“…These tools have been used in various missions that include Space Interferometry Mission (SIM) [7], Next Generation Space Telescope (NGST) [8], Thirty Meter Telescope (TMT) [9] and Very Large Telescope Interferometer (VLTI) [10], Terrestrial Planet Finder (TPF) [11] and so on. In this paper, development of an integrated analysis framework has been introduced and it includes the on-board disturbance, structure and optical system model.…”

Section: Introductionmentioning

confidence: 99%

Development of Integrated Simulation Tool for Jitter Analysis

Lee¹,

Yoon²,

Han³

2012

International Journal of Aeronautical and Space Sciences

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Pointing stability of high precision observation satellites must satisfy the stringent requirements to perform at a designed level. As even a small vibrational disturbance can result in severe degradation of the optical performance, the effects of inorbit vibrational environment on the performance of optical payload must be predicted and analyzed in the design phase in order to ensure that the requirements imposed on the payload are fully met. In this paper, an integrated framework for the evaluation of the performance of optical payloads is developed. The developed simulation tool comprises of the reaction wheel induced disturbance model, state space model of a structure in modal form and Cassegrain reflector model. The performance degradation of the optical system due to jitter is expressed by using modulation transfer function (MTF) and image simulation. Moreover, vibration isolator model is also added to show the effectiveness of using a vibration isolator for the elimination of the effects of jitter in the acquisition of an image.

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“…11 rather than directly applying loads obtained from CFD or wind tunnel data as in Refs. 14,16,17. Maintaining sufficient computational simplicity to allow rapid iterations is also important.…”

Section: Introductionmentioning

confidence: 99%

Modeling wind-buffeting of the Thirty Meter Telescope

MacMynowski

Blaurock²,

Angeli³

et al. 2006

SPIE Proceedings

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The Thirty Meter Telescope project is designing a 30 m diameter ground-based optical telescope. Unsteady wind loads on the telescope structure due to turbulence inside the telescope enclosure impact the delivered image quality. A parametric model is described that predicts the optical performance due to wind with sufficient accuracy to inform relevant design decisions, including control bandwidths. The model is designed to be sufficiently computationally efficient to allow rapid exploration of the impact of design parameters or uncertain/variable input parameters, and includes (i) a parametric wind model, (ii) a detailed structural dynamic model derived from a finite element model, (iii) a linear optical response model, and (iv) a control model. Model predictions with the TMT structural design are presented, including the parametric variation of performance with external wind speed, desired wind speed across the primary mirror, and optical guide loop bandwidth. For the median mountaintop wind speed of 5.5 m/s, the combination of dome shielding, minimized cross-sectional area, and control results in acceptable image degradation.

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Integrated modeling tools for large ground-based optical telescopes

Cited by 16 publications

References 10 publications

Toward end-to-end optical system modeling and optimization: a step forward in optical design

Toward end-to-end optical system modeling and optimization: a step forward in optical design

Development of Integrated Simulation Tool for Jitter Analysis

Modeling wind-buffeting of the Thirty Meter Telescope

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