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MAS Spectral Measurements Review

MAS Spectral Measurements Review. Period covered: March 2001 – March 2003 Deployments: Texas 2001 (3/15-4/5/01) CLAMS (7/9-8/2/01) CAMEX (8/15-9/26/01) CRYSTAL (7/1-7/30/02) Texas 2002 (11/19-12/12/02) THORPEX (2/1-4/10/03). Noteworthy Shifts During Deployments:.

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MAS Spectral Measurements Review

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  1. MAS Spectral Measurements Review Period covered: March 2001 – March 2003 Deployments: Texas 2001 (3/15-4/5/01) CLAMS (7/9-8/2/01) CAMEX (8/15-9/26/01) CRYSTAL (7/1-7/30/02) Texas 2002 (11/19-12/12/02) THORPEX (2/1-4/10/03)

  2. Noteworthy Shifts During Deployments: TX 01 : spectral shifts: p2=+8nm, p3=+10nm, p4=+20nm CLAMS : very small shifts but p2 out of spec going in CAMEX4: no shifts in ports 1, 2, and 4. uneven shift in port 3 (0nm in b26 to –30nm in b41) CRYSTAL: spectral shifts: p1=+1nm, p3=+25nm, p4=+3nm band 45 failed in the field – not available for post-deployment calibration TX 02: spectral shifts: p2=+2nm, p3=-1nm, p4=+5nm THORPEX : spectral shifts: p2=+1nm, p3=+1nm, p4=+16nm

  3. 30” Sphere Stability Measurement dates: May 2001 (John Cooper with 746/ISIC) June 2001 (Pavel Hajek with ASD September 2001 (Pavel Hajek with ASD) December 2001 (Pavel Hajek with ASD) April 2002 (Pavel Hajek with ASD) June 2002 (John Cooper with 746/ISIC, Pavel Hajek with ASD) September 2002 (Pavel Hajek with ASD) December 2002 (Pavel Hajek with ASD) March 2003 (Pavel Hajek with ASD)

  4. Cary 14 Spectrophotometer • Upgraded to modern computer controls (OLIS) • But is still large, heavy • But, has great optics (and we have it) • Options for use in calibration transfer: • 45° mirror • Transfer integrating sphere • Fiber-optic head

  5. Cary 14 Block Diagram

  6. Cary photo 1

  7. Cary photo 2

  8. Cary photo 3

  9. Cary photo 4

  10. New 30” Sphere • 12 lamps, 30W ea. • 2/3 of old sphere rad. • Vertical or horizontal orientation • Labview Controlled • Power supplies, metering mounted on unit

  11. Extended BB • Being rebuilt • Best Cal Method? • Automated data logging to be added

  12. Polarization Sensitivity Measurement Equipment: 30” integrating sphere VIS polarizer: extinction ratio > 99.9% in 400-700nm, size > sphere aperture NIR polarizer with mask: extinction ratio > 99.9% in 750-2000nm, size = 3*3 inches Procedure: Record sphere radiance for max and min positions of polarizer. Calculate percentage difference. Repeat for 15 and 20 degree MAS tilt

  13. Experiment Setup

  14. Silver: s,p reflectivity vs. angle 1.24 µ Rp Rs

  15. Silver: two-mirror throughput vs. angle Two mirrors, 45° incidence, with relative axial rotation 1.24 µ Normalized to 1 at 0°

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