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APS Formation Sensor

APS Formation Sensor MECHANICAL DESIGN Rodger Farley 15 March 2002 Requirements Survive launch loads, of course. Once on orbit, to keep the 6 optics stable relative to each other to

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APS Formation Sensor

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  1. APS Formation Sensor MECHANICAL DESIGN Rodger Farley 15 March 2002

  2. Requirements Survive launch loads, of course. Once on orbit, to keep the 6 optics stable relative to each other to 10 microns. With an aluminum housing, this translates to keeping the temperature steady to ~ 0.25 deg C. Provide re-closable lid Provide 3 element filter wheel and unfiltered path, not particularly sensitive to positional placement or repeatability. Agility of the wheel is not yet specified.

  3. General Arrangement

  4. General Arrangement

  5. Design Elements, Modules Total Mass ~ • Front Baffle Module • Baffle • Re-closable lid • Light ring • Telescope Tube Module • Outer tube, with proportional heater system • 2 optics sub modules • Isolation adapter module • Titanium thermal isolation housing • Filter wheel mechanism • Detector / camera module • Flexured base plate

  6. Front Baffle Module • Baffle • Motorized lid with labyrinth edge, ‘spectralon’ surface on lid back • Ring of lights

  7. Telescope Tube Module • Aluminum tube for good thermal conductivity, minimize gradients • Temperature controlled to room temp +/- 0.25 deg C with proportional thermal control system of heaters and sensors. • Optics aluminum sub modules with bonded glass elements on triangular shaped flexure blades. • Optical elements in sub modules are pre-metered for ease of integration, and have registration pads that can be lapped. • Sub modules are ‘muzzle loaded’ into the outer tube, and preloaded with compliance using a wave ring washer and threaded ring. The sub modules bear against their own registration pads and the outer tube registration surfaces.

  8. Telescope Tube Module

  9. Isolation Adaptor Module • Titanium housing, flexured from the telescope tube module • Filter wheel with 4 elements (one blank) • D.C. brushless motor with encoder

  10. Camera Module

  11. Flexured Base Plate • Titanium flexures • Honeycomb plate

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