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

Transcription

1 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...

2 Layout of the Planetary Spectroscopy Laboratory (Status Summer 2015) Whole tract is climatized Sample preparation and characterisation Bulk Sample collection Sample conditioning Sensitive Sample collection Spectroscopy laboratory Slide 2

3 Reflectance and transmission 0.2 to 50 µm vacuum Reflectance and transmission 1 to 100 µm vacuum Reflectance 1 to 16 µm vacuum Emission 1 to 100 µm C Vacuum/nitrogen/air XRD Slide 3 MIT Lunch talk 2009 Jörn Helbert (joern.helbert@dlr.de)

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5 Slide 5 > Lecture > Author Document > Date

6 We are operating in the no signal area... Using anmct/insb sandwich detector Slide 6

7 First try, 2.5 years ago, carbonatite Slide 7

8 Lessons we learned from first try Slide 8

9 Lessons we learned from first try Slide 9

10 Lessons we learned from second try - Oxygen fugacity is not your friend Slide 10 > Lecture > Author Document > Date

11 First very small sample set Slide 11 > Lecture > Author Document > Date

12 Very first measurement of NIR emissivity at 450 C Slide 12 > Lecture > Author Document > Date

13 Band ratios Even three bands are good for basic mineralogy Slide 13 > Lecture > Author Document > Date

14 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 Pre-test using standard optics Mini- VEM g d KRS5 window Venus simulation chamber Sample cup (hot sample inside) Sketch of the setup not to scale! Slide 14

15 The cups are glowing beautifully at 1µm 450 C Obtained with VEM lab model Slide 15 > Lecture > Author Document > Date

16 So lets get rid of the cups and use slabs for now Obtained with VEM lab model Slide 16 > Lecture > Author Document > Date

17 14 hours(!) Slide 17 > Lecture > Author Document > Date

18 After several hours stuff still gets hot So lets see how to keep it cooler ~100 C Slide 18

19 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 Slide 19 Dr. Jörn Helbert (joern.helbert@dlr.de) - VEXAG 2015

20 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 Slide 20 Dr. Jörn Helbert (joern.helbert@dlr.de) - VEXAG 2015

21 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 Slide 21 Dr. Jörn Helbert - VEXAG 2015

22 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 Slide 22 Dr. Jörn Helbert (joern.helbert@dlr.de) - VEXAG 2015