iris telescope camera kimberly bott institute for astronomy mentor: klaus hodapp home institution:...
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![Page 1: IRIS Telescope Camera Kimberly Bott Institute for Astronomy Mentor: Klaus Hodapp Home Institution: University of Hawaii at Hilo 2008 Center for Adaptive](https://reader036.vdocument.in/reader036/viewer/2022081504/56649da85503460f94a94896/html5/thumbnails/1.jpg)
IRIS Telescope Camera
Kimberly BottInstitute for AstronomyMentor: Klaus Hodapp
Home Institution: University of Hawaii at Hilo
2008 Center for Adaptive Optics Akamai Internship
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Introduction• Infrared Imaging Survey
System (near IR)• Telescope fabrication in
Germany• Camera fabrication in
US • IRIS site: Cerro
Armazones Observatory in Chile
• Telescope Goals– Occultation– Variations in reflection
nebulae
• Camera Goals– Effective IR camera– Correct for spherical
aberrations
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Infrared Camera• Cryostat interior to vacuum
– Why a cryostat?
• Three components– Designed mounting– Designed and fabricated
vacuum casing– Learned to fabricate on
cryostat piece– Goals
• Be lightweight, balanced and strong
• Allow extra volume for cryostat piece
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Infrared Camera• Cryostat interior to vacuum
– Why a cryostat?
• Three components– Designed mounting– Designed and fabricated
vacuum casing– Learned to fabricate on
cryostat piece– Goals
• Be lightweight, balanced and strong
• Allow extra volume for cryostat piece
![Page 5: IRIS Telescope Camera Kimberly Bott Institute for Astronomy Mentor: Klaus Hodapp Home Institution: University of Hawaii at Hilo 2008 Center for Adaptive](https://reader036.vdocument.in/reader036/viewer/2022081504/56649da85503460f94a94896/html5/thumbnails/5.jpg)
Infrared Camera• Cryostat interior to vacuum
– Why a cryostat?
• Three components– Designed mounting– Designed and fabricated
vacuum casing– Learned to fabricate on
cryostat piece– Goals
• Be lightweight, balanced and strong
• Allow extra volume for cryostat piece
![Page 6: IRIS Telescope Camera Kimberly Bott Institute for Astronomy Mentor: Klaus Hodapp Home Institution: University of Hawaii at Hilo 2008 Center for Adaptive](https://reader036.vdocument.in/reader036/viewer/2022081504/56649da85503460f94a94896/html5/thumbnails/6.jpg)
Infrared Camera• Cryostat interior to vacuum
– Why a cryostat?
• Three components– Designed mounting– Designed and fabricated
vacuum casing– Learned to fabricate on
cryostat piece– Goals
• Be lightweight, balanced and strong
• Allow extra volume for cryostat piece
![Page 7: IRIS Telescope Camera Kimberly Bott Institute for Astronomy Mentor: Klaus Hodapp Home Institution: University of Hawaii at Hilo 2008 Center for Adaptive](https://reader036.vdocument.in/reader036/viewer/2022081504/56649da85503460f94a94896/html5/thumbnails/7.jpg)
Testing the Camera’s Existing Cryostat
• Test vacuum• Inject liquid nitrogen
into cryostat – Monitored weight of
camera to determine holding time
– Improve holding time– Retest with new
pieces
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Design of Mounting Piece
• Designed as strong connection between camera and telescope
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Vacuum Casing Design
• AutoCAD drawing• Connection between
existing casing and large mounting piece
• Allowing for an effective vacuum– Smooth to reduce
dust/oil presence– Lower emissivity
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Fabricating the Part
• Used lathe to aid other intern with small cryostat piece
• Began work on own part– Required improvising
due to unusual size and an octagonal end
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Testing the Part
• Assembled• Achieved near
perfect vacuum
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Filter Wheel Electronics
• 7 IR filters on large gear
• Driven by stepper motor
• Located with a Hall Effect Sensor
• Controlled through computer (program in C)
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Electronics
• Replaced connections– Female electronics
to male– Female to the
stepper motor and the Hall Effect sensor
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Electronics Testing and Results
• Tested connections with multimeter
• Tested ensemble, ran program to begin locating filters– Did not align– Fixed number of
teeth in C program– Still an issue finding
the magnet
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Conclusions
Mounting piece: accurate design
Vacuum casing: effective vacuum which does hold
Filter wheel electronics: good connections but improper alignment not due to tooth number
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Acknowledgements and Sources
• The Akamai Internship Program, funded by the Center for Adaptive Optics through its National Science Foundation Science and Technology Center grant (#AST-987683)
• Institute for Astronomy • Dr. Klaus Hodapp• Richard Shelton
• “The Infrared Imaging Survey (IRIS) System”, Hodapp et al.• “Cryostat Design and Construction at the IRTF”, Toomey et al.• http://uigi.com/nitrogen.html
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Additional Links
• http://www.magnet.fsu.edu/education/tutorials/java/halleffect/index.html