Rapidly solidified aluminium for optical applications

Gubbels, G.; Venrooy, B. W. H.; Bosch, Albert J.; Senden, Roger

doi:10.1117/12.788766

Cited by 29 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Due to interferometric measurements and following correction loops the figure deviation of the M2 mirror is reduced to around 100 nm p.-v.. Due to the usage of a novel aluminium alloy with refined grain size the surface roughness is less than 4 nm RMS (measurement area 315 μm x 235 μm) [4].…”

Section: B On-axis Mirrorsmentioning

confidence: 99%

MERTIS: the thermal infrared imaging spectrometer onboard of the Mercury Planetary Orbiter

Zeh

Peter

Walter

et al. 2017

International Conference on Space Optics — ICSO 2012

View full text Add to dashboard Cite

-The MERTIS instrument is a thermal infrared imaging spectrometer onboard of ESA's cornerstone mission BepiColombo to Mercury. MERTIS has four goals: the study of Mercury's surface composition, identification of rock-forming minerals, mapping of the surface mineralogy, and the study of the surface temperature variations and thermal inertia. MERTIS will provide detailed information about the mineralogical composition of Mercury's surface layer by measuring the spectral emittance in the spectral range from 7-14 μm at high spatial and spectral resolution. Furthermore MERTIS will obtain radiometric measurements in the spectral range from 7-40 μm to study the thermo-physical properties of the surface material. The MERTIS detector is based on an uncooled micro-bolometer array providing spectral separation and spatial resolution according to its 2-dimensional shape. The operation principle is characterized by intermediate scanning of the planet surface and three different calibration targets -free space view and two on-board black body sources. In the current project phase, the MERTIS Qualification Model (QM) is under a rigorous testing program. Besides a general overview of the instrument principles, the papers addresses major aspects of the instrument design, manufacturing and verification.

show abstract

Section: B On-axis Mirrorsmentioning

confidence: 99%

MERTIS: the thermal infrared imaging spectrometer onboard of the Mercury Planetary Orbiter

Zeh

Peter

Walter

et al. 2017

International Conference on Space Optics — ICSO 2012

View full text Add to dashboard Cite

show abstract

“…10,48149 Münster, Germany (4) Fraunhofer-Institut für angewandte Optik und Feinmechanik, Albert-Einstein-Str. 7, 07745 Jena, Germany (5) Institute of Photonic Technology e.V., Albert-Einstein-Straße 9, 07745 Jena, Germany…”

Section: )unclassified

Section: On-axis Mirrorsmentioning

confidence: 99%

Thermal infrared spectrometer MERTIS for the BepiColumbo Mission to Mercury

Zeh

Kaiser

Lenfert

et al. 2017

International Conference on Space Optics — ICSO 2008

View full text Add to dashboard Cite

“…The main reason for this is that the infrared wavelength is long enough and not scatter too much on the diamond turned surface. To be applicable for the visual spectrum, surface roughness Rq needs to be in the order of 2 nm or less [5] to have less than 1% scattering. Looking at the mostly applied diamond turnable materials, these values only seem attainable in phosphorus nickel platings and special electrodeposited high purity aluminiums like Alumiplate [6].…”

Section: Surface Roughnessmentioning

confidence: 99%

“…Commercially available aluminium typically results in Rq roughness values >5 nm. New developments are rapidly solidified aluminium grades that result in surface roughness values Rq < 3 nm [5], [7], [8]. An example of such a diamond turned surface is shown in Figure 5.…”

Section: Surface Roughnessmentioning

confidence: 99%

Accuracy of freeform manufacturing processes

2009

View full text Add to dashboard Cite

The breakthrough of freeform optics is limited by manufacturing and metrology technology. However, today's manufacturing machines like polishing robots and diamond turning machines are accurate enough to produce good surface quality, so the question is how accurate can a freeform be produced. To investigate how accurate freeform optics can be diamond turned, measurable freeforms (e.g. an "off-axis" sphere) were diamond turned and they were compared to there on-axis equivalents. The results of this study are described in this paper. Furthermore, an overview of the accuracies of freeform optics that TNO diamond turned are presented. An indication of freeform accuracy for diamond turned optics is derived from this, which can be used for optical designers as a guideline in their design work.

show abstract

Rapidly solidified aluminium for optical applications

Cited by 29 publications

References 0 publications

MERTIS: the thermal infrared imaging spectrometer onboard of the Mercury Planetary Orbiter

MERTIS: the thermal infrared imaging spectrometer onboard of the Mercury Planetary Orbiter

Thermal infrared spectrometer MERTIS for the BepiColumbo Mission to Mercury

Accuracy of freeform manufacturing processes

Contact Info

Product

Resources

About