Venus in a box – High temperature NIR emissivity ... · High temperature NIR emissivity measurements of Venus analogs ... Mario D‘Amore, Sue Smrekar ... Slide 14 Planetary Emissivity

Venus in a box – High temperature NIR emissivity measurements of Venus analogs

Jörn Helbert, Sabrina Ferrari, Alessandro Maturilli, Dennis Wendler, Darby Dyar, Lindy Elkins-Tanton, Jean-Michel Reese, Thomas Widemann, Mario D‘Amore, Sue Smrekar And many many many more...

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Planetary Emissivity Laboratory

Layout of the Planetary Spectroscopy Laboratory (Status Summer 2015)

Sample preparation and characterisation

Sample conditioning Bulk Sample

collection

Spectroscopy laboratory

Sensitive Sample

collection

•  Whole tract is climatized http://goo.gl/srdibP

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MIT Lunch talk 2009 – Jörn Helbert ([email protected])

Reflectance and transmission 0.2 to 50 µm

vacuum

Reflectance and transmission 1 to 100 µm

vacuum Emission 1 to 100 µm 35°-1000°C

Vacuum/nitrogen/air

Reflectance 1 to 16 µm

vacuum XRD

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> Lecture > Author • Document > Date

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We are operating in the „no signal“ area...

Using anMCT/InSb sandwich detector

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First try, 2.5 years ago, carbonatite

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Lessons we learned from first try

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Lessons we learned from first try

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Lessons we learned from second try - Oxygen fugacity is not your friend

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First very small

sample set

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Very first measurement of NIR emissivity at 450°C

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Band ratios – Even three bands are good for basic mineralogy

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Using VEM test board to test the chamber  Sensor type: OmniVision OV5647 Color CMOS QSXGA (5-megapixel)  Using commercial telecentric and relay optics  IFOV=0,05° (assuming we integrate 10 pixel) Implementing 4 filters on a wheel

g

d

Mini-VEM

Venus simulation chamber

Sample cup (hot sample inside)

KRS5 window

Sketch of the setup – not to scale!

Pre-test using standard optics

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The cups are glowing beautifully at 1µm

450°C

Obtained with VEM lab model

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Obtained with VEM lab model

So lets get rid of the cups and use slabs for now

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14 hours(!)

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After several hours stuff still gets hot – So lets see how to keep it cooler

~100°C

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Upcoming extension of the lab

We won this summer an European Union grant to establish high temperature emissivity down to 700nm Upcoming upgrades are:

InGaAs detector  CaF2 beam splitter  Update of the spectrometer electronics Redesigned baffling  Additional cameras in the chamber for monitoring And some more goodies...

 This facility will be open for the community in 2 years as Transnational Access Facility in the EuroPlanet Research initiative

 http://www.europlanet-2020-ri.eu/

Dr. Jörn Helbert ([email protected]) - VEXAG 2015

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As a special treat for VEXAG: Very first measurements of komatiite sample at 850 and 905 nm using an early VEM lab model


850nm ≈ 0.95 ± a lot 905nm ≈ 0.93 ± a lot

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Conclusions

We have successfully obtained the first measurements of NIR emissivity at Venus surface temperatures We identified the main issues that prevent us from doing these measurements routinely We have identified the necessary upgrades that we need to perform

And we have the funding to do them! We have been successfully using the VEM breadboard to obtain first measurements They actually help us improving the setup


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Planetary Emissivity Laboratory US visitors under the EuroPlanet Research Infrastructure

Just to confirm that US visitors are eligible to come to the facilities (and receive funding) providing they are: They are members of a user group/team with at least half of the users working in Member States or Associate countries. OR They are members of a user group with a majority of users not working in a EU or associated country but the total quantity of access given under the grant to such user groups is less than 20% of the total quantity of access provided under the grant


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Venus in a box – High temperature NIR emissivity ... · High temperature NIR emissivity measurements of Venus analogs ... Mario D‘Amore, Sue Smrekar ... Slide 14 Planetary Emissivity