l8_optics_3

l8_optics_3 - Chart: 1 Adaptive Reconnaissance Golay...

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Unformatted text preview: Chart: 1 Adaptive Reconnaissance Golay Adaptive Reconnaissance Golay-3 Optical Satellite 3 Optical Satellite (ARGOS) (ARGOS) Prof David W. Miller Prof David W. Miller Chart: 2 ARGOS Overview ARGOS Overview ISS Moon Frictionless Air Bearing RWA Surrogate Ground Station M.I.T. Angular Resolution at =550 nm: 0.35 arcsec Wavelength Regime: 400-700 nm FOR (Field-of-Regard): 120 (full cone) FOV (Field-of-View)-min: 3 x 3 arcmin SNR 100 (Min) Pointing Accuracy: +/- 10 arcsec Autonomous Operation: > 1 hour Angular Resolution at =550 nm: 0.35 arcsec Wavelength Regime: 400-700 nm FOR (Field-of-Regard): 120 (full cone) FOV (Field-of-View)-min: 3 x 3 arcmin SNR 100 (Min) Pointing Accuracy: +/- 10 arcsec Autonomous Operation: > 1 hour Wireless COMM Station First field operation in May First field operation in May Goal : Demonstrate the feasibility of Interferometry technology Goal : Demonstrate the feasibility of Interferometry technology Chart: 3 Full Structure Full Structure Chart: 4 Sub Sub-- Aperture Manufacturing Aperture Manufacturing TAKAHASHI 8-inch High Precision (RMS WF errors 1/20 ) Telescope Final Design Designed optimized achromatic doublet to convert a focal telescope to afocal with Magnification m=10 FK51/BaK2 CTE 5.3 0.0027 RMS Error Some sensitivity to thermal shock -Manufacturable tolerances FK51/BaK2 CTE 5.3 0.0027 RMS Error Some sensitivity to thermal shock -Manufacturable tolerances FK51 BaK2 Chart: 5 Relay Optics Design Relay Optics Design 1. Sub Aperture 2. Collimator 3. FSM+ODL 4. Pyramidal Mirror 5. Beam Combiner 6. CCD 1 2 3 4 5 6 The Advantages of Two Mirror Design the cost, the controller complexity, less reflectance loss, smaller possible misalignment errors, compactness The Advantages of Two Mirror Design the cost, the controller complexity, less reflectance loss, smaller possible misalignment errors, compactness Chart: 6 Allowable Structural Allowable Structural Misalignments Misalignments B= FSM rotation A B 45-B 45-A+B = 45- B 2B=A B= 0.5 *A *10 = 5 A. In reality, a factor of 6.4 works well up to 0.01 degree Telescope Tilt [Deg] [arcsec] FSM Comp [Deg] Max 0.034 degree FSM OPD [mm] Strehl Ratio Aberrated SR restored 0.0001 0.36-0.00064 0.687 0.982 0.001 3.6-0.0064 0.016 0.979 0.005 18-0.032 0.192 0.907 0.01 36-0.064 0.064 0.604 0.01 36-0.064 0.0002 0.189 0.859 Magnification m=10 Chart: 7 Passive/Active Actuators Passive/Active Actuators 1 2 3 4 5 6 FSM+ODL Angular Range +/- 600 rad Angular Res. +/- 0.05 rad Linear Range 12 m Linear Res. 0.2 nm FSM+ODL Angular Range +/- 600 rad Angular Res. +/- 0.05 rad Linear Range 12 m Linear Res. 0.2 nm FSM MOUNT Angular Range +/- 7 Angular Res. +/- 0.0008 (14 rad) Linear Range 1 cm Linear Res. 1 m FSM MOUNT Angular Range +/- 7 Angular Res. +/- 0.0008 (14 rad) Linear Range 1 cm Linear Res. 1 m 7 600 rad 0.05 rad FSM 14 rad Mount...
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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l8_optics_3 - Chart: 1 Adaptive Reconnaissance Golay...

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