Transcript Radiometric Calibration for the MAIA Laser Receiver

Radiometric Calibration
for the MAIA Laser
Receiver
Stacey R. Sueoka
Mentor: Robert Nolan
Supervisor: Don Ruffatto
Textron Systems
Outline
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Textron Systems
MAIA
• Importance
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Laser ranging
Radiometric Measurements
• Laser and receiver system
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Radiometric Calibration
• In lab calibration
• Plan for absolute calibration
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Conclusion
Textron Systems Ohana
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Out of the 30 people working on
Maui, one third were born and raised
here
Majority of Kauai Textron employees
were born and raised in Hawaii
Also provides opportunities for
students like me to gain insight on
future technical occupations in
Hawaii
Textron Projects
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Image processing
Mount control systems
Laser radar projects
• STSS
• HI-CLASS
• MAIA
MAIA Location
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Maui Space Surveillance Site (MSSS)
http://www.maui.afmc.af.mil/
Beam Director/Tracker
Advanced Electro-Optical
System
Importance of MAIA
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Customer - Air
Force
• Space Situational
Awareness
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High repetition rate
laser ranging
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Radiometric
measurements
Radiometry
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Measurement of the intensity of
electromagnetic radiation
Used to characterize the satellite
Image by Philip Ronan
MAIA Laser Receiver
AEOS
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Telescope receives
reflected light from
object
Integrated into the
optical subsystem
of AEOS (coude
room 4)
http://www.maui.afmc.af.mil/
Receiver Box
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Intensified Photo-Diode detector
Reference Detector
Step 1: In lab calibration of the IPD
Optical table layout for calibration
Responsivity =
average area
divided by energy
per pulse
Energy read by IPD
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Responsivity = 1 ADU/ 50 Photons
• Goal is 1 ADU/ 20 Photons
• Efforts in progress to improve
responsivity
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Using responsivity:
• Divide IPD reading by responsivity to
calculate energy
Step 2: Plan for star calibration
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How do we get there?
• Select stars
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Check online database for
magnitudes
Determine exoatmospheric irradiance
at 1064 nm using a technique refined
by NGST
Measure Stellar Signal at Several
Elevations (Air Masses)
• Determine extinction coefficient
• Calculate zero point
Conclusion
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Recap – What was accomplished :
• Learned about MAIA laser and receiver system
• Worked on determining the responsivity of the
receiver
• Created a procedure for the absolute
calibration using stars
• Supported the optical integration of the
receiver into MSSS
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Gained insight on astronomy and
radiometry
Acknowledgements
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Textron Systems
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Robert Nolan
Don Ruffatto
Curtis Krupp
Timothy Georges
Chris Matsuura
Bob Lercari
Nathan Kimura
Wes Ueoka
Kelly Kobayashi
Air Force Research
Laboratory
Maui Economic
Development Board
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Maui Community College
Institute for Astronomy
Center for Adaptive
Optics
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Lisa Hunter
Scott Seagroves
Hilary O’Bryan
Short Course
Instructors:
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Dave Harrington
Jess Johnson
Ryan Montgomery
Isar Mostafanezhad
This work has been supported by the National Science Foundation Science and
Technology Center for Adaptive Optics, managed by the University of California at
Santa Cruz under cooperative agreement No. AST - 9876783.