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Radiometric Calibration Radiometric Calibration for the MAIA Laser for the MAIA Laser
ReceiverReceiver
Stacey R. SueokaStacey R. SueokaMentor: Robert NolanMentor: Robert Nolan
Supervisor: Don RuffattoSupervisor: Don RuffattoTextron SystemsTextron Systems
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OutlineOutline
Textron Systems Textron Systems MAIAMAIA
• ImportanceImportance Laser rangingLaser ranging Radiometric MeasurementsRadiometric Measurements
• Laser and receiver systemLaser and receiver system Radiometric Calibration Radiometric Calibration
• In lab calibrationIn lab calibration• Plan for absolute calibrationPlan for absolute calibration
ConclusionConclusion
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Textron Systems OhanaTextron Systems Ohana
Out of the 30 people working on Out of the 30 people working on Maui, one third were born and raised Maui, one third were born and raised herehere
Majority of Kauai Textron employees Majority of Kauai Textron employees were born and raised in Hawaiiwere born and raised in Hawaii
Also provides opportunities for Also provides opportunities for students like me to gain insight on students like me to gain insight on future technical occupations in future technical occupations in HawaiiHawaii
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Textron ProjectsTextron Projects
Image processingImage processing Mount control systemsMount control systems Laser radar projectsLaser radar projects
• STSS STSS • HI-CLASSHI-CLASS• MAIAMAIA
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MAIA LocationMAIA Location Maui Space Surveillance Site (MSSS)Maui Space Surveillance Site (MSSS)
Beam Director/Tracker Advanced Electro-Optical System
http://www.maui.afmc.af.mil/
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Importance of MAIAImportance of MAIA
Customer - Air Customer - Air ForceForce• Space Situational Space Situational
Awareness Awareness
High repetition rate laser ranging
Radiometric measurements
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RadiometryRadiometry Measurement of the intensity of Measurement of the intensity of
electromagnetic radiation electromagnetic radiation Used to characterize the satelliteUsed to characterize the satellite
Image by Philip Ronan
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MAIA Laser ReceiverMAIA Laser Receiver
Telescope receives Telescope receives reflected light from reflected light from objectobject
Integrated into the Integrated into the optical subsystem optical subsystem of AEOS (coude of AEOS (coude room 4)room 4)
AEOS
http://www.maui.afmc.af.mil/
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Receiver BoxReceiver Box Intensified Photo-Diode detectorIntensified Photo-Diode detector Reference DetectorReference Detector
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Step 1: In lab calibration of the IPDStep 1: In lab calibration of the IPD
Optical table layout for calibration
Responsivity = Responsivity = average area average area divided by energy divided by energy per pulseper pulse
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Energy read by IPDEnergy read by IPD
Responsivity = 1 ADU/ 50 PhotonsResponsivity = 1 ADU/ 50 Photons• Goal is 1 ADU/ 20 PhotonsGoal is 1 ADU/ 20 Photons• Efforts in progress to improve Efforts in progress to improve
responsivityresponsivity Using responsivity:Using responsivity:
• Divide IPD reading by responsivity to Divide IPD reading by responsivity to calculate energycalculate energy
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Step 2: Plan for star calibrationStep 2: Plan for star calibration
How do we get there?How do we get there?• Select starsSelect stars
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Check online database for Check online database for magnitudesmagnitudes
Determine exoatmospheric Determine exoatmospheric irradiance at 1064 nm using a irradiance at 1064 nm using a technique refined by NGST technique refined by NGST
Measure Stellar Signal at Several Measure Stellar Signal at Several Elevations (Air Masses)Elevations (Air Masses)• Determine extinction coefficientDetermine extinction coefficient• Calculate zero pointCalculate zero point
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Conclusion Conclusion
Recap – What was accomplished :Recap – What was accomplished :• Learned about MAIA laser and receiver systemLearned about MAIA laser and receiver system• Worked on determining the responsivity of the Worked on determining the responsivity of the
receiverreceiver• Created a procedure for the absolute Created a procedure for the absolute
calibration using starscalibration using stars• Supported the optical integration of the Supported the optical integration of the
receiver into MSSSreceiver into MSSS Gained insight on astronomy and Gained insight on astronomy and
radiometryradiometry
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AcknowledgementsAcknowledgements Textron SystemsTextron Systems
• Robert NolanRobert Nolan• Don RuffattoDon Ruffatto• Curtis KruppCurtis Krupp• Timothy GeorgesTimothy Georges• Chris MatsuuraChris Matsuura• Bob LercariBob Lercari• Nathan KimuraNathan Kimura• Wes UeokaWes Ueoka• Kelly KobayashiKelly Kobayashi
Air Force Research Air Force Research LaboratoryLaboratory
Maui Economic Maui Economic Development BoardDevelopment Board
Maui Community CollegeMaui Community College Institute for AstronomyInstitute for Astronomy Center for Adaptive Center for Adaptive
OpticsOptics• Lisa HunterLisa Hunter• Scott SeagrovesScott Seagroves• Hilary O’BryanHilary O’Bryan• Short Course Short Course
Instructors:Instructors: Dave HarringtonDave Harrington Jess JohnsonJess Johnson Ryan MontgomeryRyan Montgomery Isar MostafanezhadIsar 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.