Measuring the quality of alignment of an assembled compound lens is often necessary. This raises the question of what axis to use as a reference axis for this measurement. We suggest that the reference axis should be the optical axis of the assembled system and that this axis is unique for each assembly.
A system of collection optics was designed and built to perform imaging spectroscopy on shock waves created in the
Electric Arc Shock Tube (EAST) at NASA Ames Research Center. This reflective system has four channels and collects
radiation wavelengths that span from the vacuum ultraviolet to the near-infrared (120-1700nm). A telecentric object
space minimizes blur along the direction of propagation of the shock wave. Additional fold mirrors preserve image
orientation and cause the system to be symmetric with respect to the spectrometer entrance slits. The aperture is
angularly segmented to allow more than one channel on each side of the shock tube. Optical/mechanical design trade
studies, photographs of the as-built system and sample data are presented.
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