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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.

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fts test definition summary

FTS Test Definition Summary

Kaley Walker

Test Readiness Review

January 29, 2003

what needs to be done
What Needs to be Done
  • Performance testing of:
    • Passive cooler / detectors
    • Suntracker / co-registration
    • Imagers
    • Spectrometer (ILS, FOV etc.)
passive cooler
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
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
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
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
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

80 mrad

+

A. Setup suntracker mirror to point here.

B. Move collimator mirror to move image here

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)
co registration
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
Imager Characterization
  • Flat Field Bench
    • Solar simulator to provides uniform illumination (Priority 2)
  • Flat Field TVac
    • Illuminate stepwise using QI source (Priority 2)
  • Non-linearity TVac
    • Stepwise illumination and vary attenuation (Priority 2)
imager charaterization
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
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 measurements1
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
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
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
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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