FTS Test Definition Summary Kaley Walker Test Readiness
FTS Test Definition Summary Kaley Walker Test Readiness Review January 29, 2003 What Needs to be Done Performance testing of: Passive cooler / detectors Suntracker / co-registration Imagers
Spectrometer (ILS, FOV etc.) Passive Cooler Evaluate performance of passive cooler using He cooled target Monitor detector and target temperatures While cooling from room temperature During instrument temperature transitions Priority 1 Detector Temperature
Measure while cooling detector every 5 K from 110 70? K High resolution spectra + N2O gas cell Examine ILS vs. T and estimate NESR Retrieve temperature and pressure Low resolution spectra Bandpass characteristics Priority 1
Detector Non-linearity Measure while cooling detector every 5 K from 110 70? K Low resolution interferograms At 1750, 2250, 2750 K (+ 3273 K from previous) Ratio of centre burst to first side lobe to calculate 5800 K point measured on orbit Priority 1 Operational Cycling
Measure at 90 K and lowest achieved T Simulate normal operational power dissipation Cycle between SCIENCE and SLEEP mode as for nominal occultation Monitor detector temperature for any changes in cooling rate Priority 3 Detector Monitoring InSb Instability (Priority 1)
Monitor channel for recurrence of problem Contamination Monitoring (Priority 1) Measure low resolution spectra every 12 hours using 2273 K HBB Need criteria for when decontamination should be initiated Suntracker Sunscan exercise mode using typical scan for MAESTRO calibration (Priority 1)
Stability measure in closed loop with sunrise simulator (~50 s occultation) (Priority 2) Pointing characterize pointing over 1.5 range using leapfrog technique (Priority 2) + 80 mrad A. Setup suntracker mirror to point here.
B. Move collimator mirror to move image here Co-registration MAESTRO to VIS (Priority 2) On bench with 532 nm laser source and in TVac with Xe lamp and pinhole FTS to NIR (Priority 2) Combined QI / HBB source and pinhole
NIR to VIS Registration (Priority 3) relative orientation and pixel offset between arrays Imager Characterization Flat Field Bench Solar simulator to provides uniform illumination (Priority 2) Flat Field TVac Illuminate stepwise using
source (Priority 2) Non-linearity TVac Stepwise illumination and vary attenuation (Priority 2) QI Imager Charaterization Gain characterize imager settings (Priority 2) Dark Current measure versus instrument
temperature; perform prior to each test with imagers (Priority 2) Cropping test modes with sunrise simulator and attenuated source (Priority 3) Gas Cell Measurements Combined Measure NO2 and O3 with both FTS and MAESTRO (Priority 2) compare retrieved temperature and pressure values Additional N2O measurements with FTS at
instrument temperature plateaux (Priority 2) Examine ILS vs. T and estimate NESR Retrieve temperature and pressure Gas Cell Measurements Occultation Use suntracker to follow simulated occultation and measure FTS (and MAESTRO) spectra (Priority 3) Have to step through occultation to allow for time for sufficient coadds Suntracker pointing in closed-loop at fixed source
Somewhat unwieldy test that cannot provide test as we fly conditions FTS Tests IR FOV Move shutter stepwise across FOV and measure ZPD (Priority 2/3) Non-uniform FOV Illumination Use split attenuator to observe ILS effects (Priority 3) Modulation Efficiency To be done by Bomem (Priority 2)
Limit in Testing HBB cavity lifetime ~30-40 minutes at 3273 K and we only have 4 cavities Almost all tests done at max. temperature Priority 1 ~ 57 minutes Priority 2 ~ 65 minutes Priority 3 ~ 268 minutes Majority of # 3 is Occultation 223 minutes without it we should have enough HBB lifetime to complete testing program
Issues Detector Decontamination Need criteria for when this should be initiated Occultation test Significant drain on HBB lifetime Recommend deleting from test schedule
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