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21 September 2007 JWST-MIRI spectrometer main optics alignment and tolerancing philosophy
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MIRI ('Mid Infrared Instrument') is the combined imager and integral field spectrometer for the 5-29 micron wavelength range under development for the JWST. The Spectrometer Main Optics (SMO) system has been designed on the basis of a 'no adjustments' philosophy. This means that the optical alignment precision depends strongly on the design, tolerance analysis and detailed knowledge of the manufacturing process. Because in principle no corrections are possible after assembly, continuous tracking of the alignment performance during the design and manufacturing phases is important. This is done by controlling the "alignment budget" which allows a detailed comparison of the required and achieved alignment from component to system level. This paper will describe the development of the SMO alignment budget, and how it is used to bring the alignment performance under control. In addition, we will discuss the results of the actual alignment measurements on the SMO hardware and the feedback of these results into the alignment budget.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gabby Kroes, Michael Meijers, Ad Oudenhuysen, and Jan Willem Pel "JWST-MIRI spectrometer main optics alignment and tolerancing philosophy", Proc. SPIE 6676, Optical System Alignment and Tolerancing, 66760J (21 September 2007);

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