Structural optimization of a space mirror to selectively constrain optical aberrations

Sahu, Rupali; Patel, Vrushang; Singh, Sandeep; Munjal, B. S.

doi:10.1007/s00158-016-1616-x

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…Previously, topology optimization has shown its benefits in the design of mirror mounts for optical performance. For example the minimization of deformations of optical surfaces under static (Park et al 2005;Sahu et al 2017) and thermal loads (Kim et al 2005) and mass minimization while constraining deformations as well as the fundamental eigenfrequency (Hu et al 2017a). Furthermore, semi-kinematic flexible mirror mounts are topologically optimized by, Hu et al (2017b) who minimize surface form errors subjected to both static and thermal loads constrained by a minimum natural eigenfrequency, and Van der Kolk et al (2017), who achieve optimal damping characteristics at source frequencies.…”

Section: Approach: Simultaneous Multicomponent Multidisciplinary Topomentioning

confidence: 99%

Topology optimization of multicomponent optomechanical systems for improved optical performance

Koppen

Kolk

Kempen

et al. 2018

Struct Multidisc Optim

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The stringent and conflicting requirements imposed on optomechanical instruments and the ever-increasing need for higher resolution and quality imagery demands a tightly integrated system design approach. Our aim is to drive the thermomechanical design of multiple components through the optical performance of the complete system. To this end, we propose a new method combining structural-thermal-optical performance analysis and topology optimization while taking into account both component and system level constraints. A 2D two-mirror example demonstrates that the proposed approach is able to improve the system's spot size error by 95% compared to uncoupled system optimization while satisfying equivalent constraints. Keywords Topology optimization • Multidisciplinary design optimization • System optimization • Optical instrumentation • Optomechanics • Thermoelasticity • Structural-thermal-optical-performance analysis 1 Introduction 1.1 Optomechanical instruments Optomechanical instruments control light by means of optics and generally have to meet very stringent optical, mechanical and thermal requirements (e.g. Chin 1964; S. Koppen

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Section: Approach: Simultaneous Multicomponent Multidisciplinary Topomentioning

confidence: 99%

Topology optimization of multicomponent optomechanical systems for improved optical performance

Koppen

Kolk

Kempen

et al. 2018

Struct Multidisc Optim

View full text Add to dashboard Cite

show abstract

“…And the error is random, which is reflected in each product is not exactly the same, so it cannot be estimated accurately. Slight deviations of the mirror's dimensions result in a change of the center of gravity and inertial moments in the case of large optics [9]. Combined with assembly errors of the mirror, the mirror's surface error would not be minimized as expected.…”

Section: Introductionmentioning

confidence: 96%

Examination of the Blank Error on Mirror Accuracy of Lightweight SiC Mirror and a Compensation Method

Jiang

Zhou

2022

Photonics

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Due to excellent characteristics of specific stiffness and thermal stability, silicon carbide-based (SiC) material is commonly selected to construct large-scale lightweight mirror. In general, the fabrication process of SiC mirror is similar to the casting process. The blank error of SiC mirror is 0~1 mm. Due to the high hardness of SiC, only the mirror surface and some positioning surface will be milled. The mirror surface accuracy will be degraded due to the fact that the blank error can cause significant changes in weight distribution. In this paper, Monte Carlo analysis is firstly performed to examine the blank error on gravity center, stiffness and mirror accuracy of a SiC mirror. It is found that according to the designed mount location, the amount of degradation is more than 2.5 nm of which the probability is 40.3%. It is known that the error of gravity center can be compensated by optimizing the axial mount location. Then inverse modeling and testing of gravity center for the SiC mirror is carried out in order to determine the optimal axial mount location. Based on the proposed method, the mirror degradation introduced by the blank error has been eliminated to the greatest extend.

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“…Additive Manufacturing (AM) methods offer new concepts for production of metal optics that can overcome the speci c limitations of CNC technologies. Internal structures can be designed with a variety of con gurations, such as periodic structures [6], honeycomb cells [7,8], and topologically optimized structures [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication by Selective Laser Melting of a LIDAR reflective unit using Metal Matrix Composite material

Boschetto

Bottini

Macera

2022

Preprint

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The Selective Laser Melting is an Additive Manufacturing technology able to directly fabricate full dense metal part from a virtual model. The geometrical complexity degree of freedom allows the implementation to several industrial applications such as the Laser Imaging Detection and Ranging systems. A key component of this system is the reflective unit which must satisfy functional requirements and a weight reduction is advisable. Aim of this work is to reach these goals by using an integrated product/process methodology which considers all the fabrication steps. A complete redesign allowed to exploit the Additive Manufacturing advantages of a Metal Matrix Composite based on AA 2000 series combined with a high content of ceramic. The component was validated via Finite Element Method simulation focused on the most critical polishing operation. Results on static and dynamic analysis showed the lightened mirror satisfies the requirements. The testing on the physical prototype confirmed the enhanced mechanical properties and the interferometric measurement verified the mirror functionality. The work evidenced that particular care must be provided to the configuration used for the polishing and the assembly in this lightened component.

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Structural optimization of a space mirror to selectively constrain optical aberrations

Cited by 17 publications

References 13 publications

Topology optimization of multicomponent optomechanical systems for improved optical performance

Topology optimization of multicomponent optomechanical systems for improved optical performance

Examination of the Blank Error on Mirror Accuracy of Lightweight SiC Mirror and a Compensation Method

Design and fabrication by Selective Laser Melting of a LIDAR reflective unit using Metal Matrix Composite material

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