Ultra-stable isostatic bonded optical mount design for harsh environments

Pijnenburg, Joep; Voert, M.J.A. te; Vreugd, J. de; Vosteen, Amir; Werkhoven, W. van; Mekking, J.; Nijland, B.A.H.

doi:10.1117/12.926155

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…An a-thermal design must be taken into consideration since critical components have a different Coefficient of Thermal Expansion (CTE). Usually, optical components have a low CTE compared to the mount, thus the a-thermal design is a critical aspect to the mount design [2]. Pijnenburg [2] studied two different a-thermalization methods: one matching the bond thickness, and the second by applying elastic elements in the mount.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, optical components have a low CTE compared to the mount, thus the a-thermal design is a critical aspect to the mount design [2]. Pijnenburg [2] studied two different a-thermalization methods: one matching the bond thickness, and the second by applying elastic elements in the mount. The first approach is to adapt the thickness of the adhesive to compensate for the expansion of the optics and mounts.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on the Isostatic Bipod Mounts for the HERA Mission LIDAR

Dias

Gordo

Onderwater³

et al. 2022

Applied Sciences

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The Light Detection and Ranging (LIDAR) is a time-of-flight altimeter instrument being developed for the HERA mission, designated as Planetary ALTimeter (PALT). PALT is positioned in the center of the top face of the HERA probe, and therefore, it cannot use radiators to stabilize its internal temperature. The contribution of this paper is the design of isostatic bipod mounts for the LIDAR primary mirror. The performance of PALT must be maintained over a wide operational range, from −60 °C to 80 °C. These temperature requirements imply that a careful isostatic mount structure design is critical to maintaining performance in all operational scenarios. The purpose of the instrument is to perform range measurements from 500 m to 14 km. The instrument will contribute to the detailed characterization of the asteroid’s topography, assist the probe navigation in operations such as fly-bys (including on the dark side of the asteroid) or landing. PALT has an emitter system that generates 2 ns, 100 µJ, 1535 nm laser pulses and a receiver system that collects the backscattered signal from the asteroid. The receiver system is composed of a 70 mm diameter Cassegrain telescope and a refractive system that focuses the signal on the sensor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis on the Isostatic Bipod Mounts for the HERA Mission LIDAR

Dias

Gordo

Onderwater³

et al. 2022

Applied Sciences

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“…This effect could be predicted [1], but requires detailed knowledge on the glue properties; adhesion/cohesion/viscosity/CTE etc. of the glue at the full temperature range.…”

Section: Bonding Lens and Holdermentioning

confidence: 99%

Opto-mechanical design for transmission optics in cryogenic space instrumentation

Kroes¹,

Venema²,

Navarro³

2017

International Conference on Space Optics — ICSO 2012

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NOVA is involved in the development and realization of various optical astronomical instruments for groundbased as well as space telescopes, with a focus on nearand mid-infrared instrumentation. NOVA has developed a suite of scientific instruments with cryogenic optics for the ESO VLT and VLTI instruments: VISIR, MIDI, the SPIFFI 2Kcamera for SINFONI, X-shooter and MATISSE. Other projects include the cryogenic optics for MIRI for the James Webb Space Telescope and several E-ELT instruments.Mounting optics is always a compromise between firmly fixing the optics and preventing stresses within the optics. The fixing should ensure mechanical stability and thus accurate positioning in various gravity orientations, temperature ranges, during launch, transport or earthquake. On the other hand, the fixings can induce deformations and sometimes birefringence in the optics and thus cause optical errors. Even cracking or breaking of the optics is a risk, especially when using brittle infrared optical materials at the cryogenic temperatures required in instruments for infrared astronomy, where differential expansion of various materials amounts easily to several millimeters per meter. Special kinematic mounts are therefore needed to ensure both accurate positioning and low stress. This paper concentrates on the opto-mechanical design of optics mountings, especially for large transmission optics in cryogenic circumstances in space instruments. It describes the development of temperature-invariant ("a-thermal") kinematic designs, their implementation in ground based instrumentation and ways to make them suitable for space instruments.

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“…The challenge of optomechanics lies in maintaining the position and shape of optical elements such that the image quality is guaranteed under all working environments (e.g. Giesen and Folgering 2003;Meijer et al 2008;Pijnenburg et al 2012). Therefore, optomechanical design is a tightly integrated process involving many disciplines such as thermal control, structural mechanics, motion control and optics.…”

mentioning

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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Ultra-stable isostatic bonded optical mount design for harsh environments

Cited by 7 publications

References 9 publications

Analysis on the Isostatic Bipod Mounts for the HERA Mission LIDAR

Analysis on the Isostatic Bipod Mounts for the HERA Mission LIDAR

Opto-mechanical design for transmission optics in cryogenic space instrumentation

Topology optimization of multicomponent optomechanical systems for improved optical performance

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