AO_Opto-mechanical__and_RTC_Design_Status_and_Issues.ppt
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Transcript AO_Opto-mechanical__and_RTC_Design_Status_and_Issues.ppt
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AO Opto-mechanical Design Status
and Issues
Now carrying 100 mm 1st relay and pickoff switchyard as baseline
Optical prescription (zemax), throughput/emmisivity, and wavefront quality
characterization available
• Need to construct wfe budget in conjunction with instruments
DM’s identified, TT mechanisms out for ROM estimates
Opto-mechanical layout first-cut accomplished, proceeding to more detailed
drawings
• Interacting with LOWFS design team
Work remaining to do:
• Optical tolerance analysis
• Thermal, flexure, and vibration analysis of table / mounting system
• FRD update
• Design manual
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RTC Design Status and Issues
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Baseline architecture is massively parallel processing paradigm. Still looking
strong
Tomography algorithm: Iterative Fourier domain preconditioned back
projection tomography
Wavefront
Wavefront
Sensors
Wavefront
Sensors
Wavefront
Sensors
Sensors
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Processors
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Image
Processors
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Processors
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Processors
Processors
Centroid algorithm
r0, guidstar brightness,
Guidestar position
Tomography
Unit
Cn2 profile
Wavefront
Wavefront
Sensors
Wavefront
Sensors
DM
Sensors
Projection
DM conjugate
altitude
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Image
Processors
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Processors
DM
Processors
Fit
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Processors
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Processors
Deformable
Processors
Mirrors
Actuator
influence
function
– Board and processor count and costing methodology established
– On board and board to board communication bandwidths understood
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Software: The main wavefront reconstruction and tomography algorithms
have been evaluated for feasibility in mpp framework:
– Main exception is split-tomography algorithm to handle tip/tilt data
– Good news: radial voxel algorithm (which saves processors and $$) looks doable
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Work remaining to do:
– Code testing procedures definition
– Design document (in progress – outline and some content generated)
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