English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

In this paper, we investigate the feasibility of using subspace systemidentification techniques for estimating transient Structural-Thermal-OpticalPerformance (STOP) models of reflective optics. As a test case, we use aNewtonian telescope structure. This work is motivated by the need for thedevelopment of model-based data-driven techniques for prediction, estimation,and control of thermal effects and thermally-induced wavefront aberrations inoptical systems, such as ground and space telescopes, optical instrumentsoperating in harsh environments, optical lithography machines, and opticalcomponents of high-power laser systems. We estimate and validate a state-spacemodel of a transient STOP dynamics. First, we model the system in COMSOLMultiphysics. Then, we use LiveLink for MATLAB software module to export thewavefront aberrations data from COMSOL to MATLAB. This data is used to test thesubspace identification method that is implemented in Python. One of the mainchallenges in modeling and estimation of STOP models is that they areinherently large-dimensional. The large-scale nature of STOP models originatesfrom the coupling of optical, thermal, and structural phenomena and physicalprocesses. Our results show that large-dimensional STOP dynamics of theconsidered optical system can be accurately estimated by low-dimensionalstate-space models. Due to their low-dimensional nature and state-space forms,these models can effectively be used for the prediction, estimation, andcontrol of thermally-induced wavefront aberrations. The developed MATLAB,COMSOL, and Python codes are available online.

Subspace identification of low-dimensional Structural-Thermal-Optical-Performance (STOP) models of reflective optics