Radiometric Calibration for the MAIA Laser Receiver Stacey

  • Slides: 15
Download presentation
Radiometric Calibration for the MAIA Laser Receiver Stacey R. Sueoka Mentor: Robert Nolan Supervisor:

Radiometric Calibration for the MAIA Laser Receiver Stacey R. Sueoka Mentor: Robert Nolan Supervisor: Don Ruffatto Textron Systems

Outline Textron Systems MAIA • Importance Laser ranging Radiometric Measurements • Laser and receiver

Outline Textron Systems MAIA • Importance Laser ranging Radiometric Measurements • Laser and receiver system Radiometric Calibration • In lab calibration • Plan for absolute calibration Conclusion

Textron Systems Ohana Out of the 30 people working on Maui, one third were

Textron Systems Ohana 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 Image processing Mount control systems Laser radar projects • STSS • HI-CLASS

Textron Projects Image processing Mount control systems Laser radar projects • STSS • HI-CLASS • MAIA

MAIA Location Maui Space Surveillance Site (MSSS) http: //www. maui. afmc. af. mil/ Beam

MAIA Location Maui Space Surveillance Site (MSSS) http: //www. maui. afmc. af. mil/ Beam Director/Tracker Advanced Electro-Optical System

Importance of MAIA Customer - Air Force • Space Situational Awareness High repetition rate

Importance of MAIA Customer - Air Force • Space Situational Awareness High repetition rate laser ranging Radiometric measurements

Radiometry Measurement of the intensity of electromagnetic radiation Used to characterize the satellite Image

Radiometry Measurement of the intensity of electromagnetic radiation Used to characterize the satellite Image by Philip Ronan

MAIA Laser Receiver AEOS Telescope receives reflected light from object Integrated into the optical

MAIA Laser Receiver AEOS Telescope receives reflected light from object Integrated into the optical subsystem of AEOS (coude room 4) http: //www. maui. afmc. af. mil/

Receiver Box Intensified Photo-Diode detector Reference Detector

Receiver Box Intensified Photo-Diode detector Reference Detector

Step 1: In lab calibration of the IPD Optical table layout for calibration Responsivity

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 Responsivity = 1 ADU/ 50 Photons • Goal is 1

Energy read by IPD Responsivity = 1 ADU/ 50 Photons • Goal is 1 ADU/ 20 Photons • Efforts in progress to improve responsivity Using responsivity: • Divide IPD reading by responsivity to calculate energy

Step 2: Plan for star calibration How do we get there? • Select stars

Step 2: Plan for star calibration How do we get there? • Select stars

 Check online database for magnitudes Determine exoatmospheric irradiance at 1064 nm using a

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 Recap – What was accomplished : • Learned about MAIA laser and receiver

Conclusion 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 Gained insight on astronomy and radiometry

Acknowledgements Textron Systems • • • Robert Nolan Don Ruffatto Curtis Krupp Timothy Georges

Acknowledgements Textron Systems • • • 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 Maui Community College Institute for Astronomy Center for Adaptive Optics • • Lisa Hunter Scott Seagroves Hilary O’Bryan Short Course Instructors: 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.