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Active Occulter Roy Coulter Institute for Astronomy/ UH

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Active Occulter. Roy Coulter Institute for Astronomy/ UH. Design Parameters. Near limb observations with minimal scattered light Moving edge centered on optical axis for good occulting Radial motion and rotating assembly Must fit within 13mm field stop volume - PowerPoint PPT Presentation

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Page 1: Active Occulter

Active Occulter

Roy Coulter

Institute for Astronomy/ UH

Page 2: Active Occulter

Design Parameters

• Near limb observations with minimal scattered light

• Moving edge centered on optical axis for good occulting

• Radial motion and rotating assembly• Must fit within 13mm field stop volume• Radial slit sensing with offset bias for limb

position adjustment• Motion requirement – a ‘few’ arc seconds,

+100 hz• Thermal control via heat pipe technology• Manual switching between observing modes

Page 3: Active Occulter

Active Occulter Concept

PI piezo electric bender, 60 V200+ Hz @ ±5 arc-sec

Thermal control:3mm heat pipes + copperstrap for occulting edge

Permanent drive system,insert bolted in place andstored on heat stop

Single photo sensor Rotation and limb position set visually by observer

Page 4: Active Occulter

Active Occulter Concept (cont.)

5mm x 5mm stopFOV = 128” x 128”

Irradiance = 2.5 W/mm2 .375 W/mm2 @ 85% refl.Thermal loads:Limb image - 24 W0.1 mm gap - 1 WOcculter - 0.7 W ave.Tracker slit - ~100 mW

max


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