Jesper Schou Instrument Scientist

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Presentation transcript:

Jesper Schou Instrument Scientist jschou@solar.stanford.edu HMI00375 Calibration Jesper Schou Instrument Scientist jschou@solar.stanford.edu

Calibration – Overview Purpose and Philosophy Calibration components Test methods Subsystem calibrations Calibrations of integrated instrument Ground based sunlight tests On-orbit calibrations, characterization and trending Future steps

Purpose and Philosophy Enable calibration of data taken on orbit Meet science requirements Maximize science return Determine optimal observing sequences Actual performance determines optimal framelist Quantify performance versus requirements derived in Instrument Performance Document (IPD) Derive actual observables performance based on IPD derivations Canned procedures Rapid characterization Repeatable Coordinate with I&T

Calibration – Test Methods Calibration sources Tunable laser Map filter profiles Stimulus Telescope with test targets Reverse optical system Useful to measure optical distortions etc. Polarization calibration GSE Designed by High Altitude Observatory Based on system currently being developed The Sun Provides excellent wavelength reference Near realistic testing possible Use existing LMSAL setup

Calibration – Subsystems Some properties can only be measured before assembly Detailed filter transmission profiles Waveplate and polarizer properties Angular dependencies Etc. Different levels of assemblies Individual optical elements, e.g. Waveplates Beamsplitters Polarizers Filter sub elements Lyot elements Entire filters or other subsystems Assembled Lyot filter Each Michelson Telescope

Calibration – Integrated Instrument Sunlight and test sources Essential for instrument characterization Understand instrument before launch Minimize commissioning time Develop analysis algorithms Baseline for trending Sunlight tests of the integrated instrument are essential to optimize the use of the instrument on orbit.

Calibration – On Orbit Various time scales Trending Daily Calibration mode images Weekly to monthly Detunes for filter calibration Polarization tests Monthly to yearly Spacecraft rolls and off-points for distortion and flat field measurements Dark frames and light transfer curves Special opportunities Mercury transits and eclipses by the Moon to measure image scale Trending Filter drifts Throughput degradation Mechanism performance Closely related to spacecraft and instrument operations

Future Steps Calibration plan available by CDR Updated throughout mission Sunlight tests preferably scheduled for times with reliable weather