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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25220

Title: Spider: Mechanical Design of a Resealable Window
Authors: Martin, Taylor G.
Advisor: Bussmann, Markus
Keywords: resealable window
Spider balloon-borne telescope
Issue Date: 23-Nov-2010
Abstract: The Spider balloon-borne telescope is a cosmology experiment designed to measure polarization in Cosmic Microwave Background radiation. Central to the success of the experiment is the engineering design of a retractable window that protects the detectors while on the ground and during ascent and descent. The design process was a balance between trying to make the simplest mechanism and ensuring robust performance. Design focussed on four component groups: the linear guide rails, the rack and pinion system, the four-bar mechanism, and the o-rings. The rails consist of a custom aluminum frame that houses a pre-manufactured linear guide system from Pacific Bearings. MR12 rails were selected to withstand the front and back thick-window frame forces of 248 N and 154 N, respectively, in the lateral direction. The rack and pinion, with motor and gearbox, drive the window in and out to deploy and retract it. The rack and pinion selected are available from Atlanta Drive Systems and can easily withstand the 174 N force required of them. The four-bar mechanism includes the rails and provides the axial movement that creates the thick window’s seal. Movement of the four-bar mechanism is also driven by the rack and pinion gears and motor. The o-rings create the seal over the cryostat faceplate, protecting the astronomical instruments from large pressure differentials. Nitrile was selected as the o-ring material for its low temperature performance and good gas impermeability properties. The interaction of the four component groups was crucial in determining their respective properties, such as strength, motor torque, and dimensions.
URI: http://hdl.handle.net/1807/25220
Appears in Collections:Master of Engineering (M.Eng.) project reports

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