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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 l.jpg

APS Formation Sensor

MECHANICAL DESIGN

Rodger Farley

15 March 2002


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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.




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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


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Front Baffle Module

  • Baffle

  • Motorized lid with labyrinth edge, ‘spectralon’ surface on lid back

  • Ring of lights


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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.



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Isolation Adaptor Module

  • Titanium housing, flexured from the telescope tube module

  • Filter wheel with 4 elements (one blank)

    • D.C. brushless motor with encoder



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Flexured Base Plate

  • Titanium flexures

  • Honeycomb plate


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