Black surfaces for infrared, aerospace, and cryogenic applications

Králı́k, Tomáš; Katsir, Dina

doi:10.1117/12.819277

Cited by 14 publications

(15 citation statements)

References 4 publications

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“…Similar to black coatings produced by vapor and electrolytic deposition 41 the structure is consistent with the lowoutgassing the demands of vacuum, cryogenic, and spaceflight applications. [42][43][44] The observed broadband absorptance can be essentially rendered independent of temperature through material selection and the structure is fully cryogenically compatible with silicon-based micromachined structures.…”

Section: Discussionmentioning

confidence: 99%

A broadband micro-machined far-infrared absorber

Wollack

Datesman

Jhabvala

et al. 2016

Review of Scientific Instruments

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The experimental investigation of a broadband far-infrared meta-material absorber is described. The observed absorptance is > 0.95 from 1 − 20 THz (300 − 15 µm) over a temperature range spanning 5 − 300 K. The meta-material, realized from an array of tapers ≈ 100 µm in length, is largely insensitive to the detailed geometry of these elements and is cryogenically compatible with silicon-based micro-machined technologies. The electromagnetic response is in general agreement with a physically motivated transmission line model.

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Section: Discussionmentioning

confidence: 99%

A broadband micro-machined far-infrared absorber

Wollack

Datesman

Jhabvala

et al. 2016

Review of Scientific Instruments

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“…stiffness, dimensional stability) and thermal behavior (coefficient of thermal expansion (CTE), thermal conductivity) are important. On the other hand, the inner structure of the housing has to show reduced stray light behavior [8][9][10][11]. Achieving lowest stray light levels in optical systems does not only require optical components with lowest imperfections in particular in terms of defects and roughness in the relevant spatial frequency range.…”

Section: Introductionmentioning

confidence: 99%

Stray light reduction of silicon particle reinforced aluminum for optical systems

Kinast

Telle

Schröder

et al. 2019

International Conference on Space Optics — ICSO 2018

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Silicon particle reinforced aluminum containing 42 wt.% silicon (Al-42Si) offers higher specific stiffness, higher resistance to thermal gradients, and an athermal behavior combined with electroless nickel, in comparison to state-of-theart aluminum alloys (e.g. Al6061). Nevertheless, typical surface modifications (e.g. black anodization) lead to a nonsufficient optical stray light suppression due to the high amount of silicon particles on the surface. Therefore, a coating technique is required that fulfils the optical and the mechanical (e.g. adhesive strength) specifications for stray light reduction on Al-42Si. Different components like housings and barrels made of Al-42Si were coated with amorphous NiP and with Fractal Black™ by Acktar Ltd. The optical performance is analyzed by angle-resolved light scattering (ARS) at two different wavelengths (532 nm and 1064 nm). Fractal Black™ offers a total scattering level of lower than 2 % at 532 nm and 1064 nm. Fractal Black™ has been proven as a suitable coating for components made of Al-42Si.

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“…The emissivity of typical high emissivity coatings are ranging from 0.85 ≤ ε 0 ≤ 0.97 in the spectral range 5 µm ≤ λ ≤ 40 . Prominent examples are summarized by [6,7,8,9,10]. Since the instrument's performance requirements are in many cases above these values, a simple coating of the emitter surface is not sufficient.…”

Section: Blackbody Calibration Sourcesmentioning

confidence: 99%

Compact blackbody calibration sources for in-flight calibration of spaceborne infrared instruments

Scheiding

Driescher

Walter

et al. 2017

International Conference on Space Optics — ICSO 2014

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High-emissivity blackbodies are mandatory as calibration sources in infrared radiometers. Besides the requirements on the high spectral emissivity and low reflectance, constraints regarding energy consumption, installation space and mass must be considered during instrument design. Cavity radiators provide an outstanding spectral emissivity to the price of installation space and mass of the calibration source. Surface radiation sources are mainly limited by the spectral emissivity of the functional coating and the homogeneity of the temperature distribution. The effective emissivity of a "black" surface can be optimized, by structuring the substrate with the aim to enlarge the ratio of the surface to its projection.Based on the experiences of the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) calibration source MBB3, the results of the surface structuring on the effective emissivity are described analytically and compared to the experimental performance. Different geometries are analyzed and the production methods are discussed. The high-emissivity temperature calibration source features values of 0.99 for wavelength from 5 µm to 10 µm and emissivity larger than 0.95 for the spectral range from 10 µm to 40 µm.

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Black surfaces for infrared, aerospace, and cryogenic applications

Cited by 14 publications

References 4 publications

A broadband micro-machined far-infrared absorber

A broadband micro-machined far-infrared absorber

Stray light reduction of silicon particle reinforced aluminum for optical systems

Compact blackbody calibration sources for in-flight calibration of spaceborne infrared instruments

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