Physics – Optics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26..774w&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 26, March 1, 1987, p. 774.
Physics
Optics
1
Calibrating, Refractivity, Rosat Mission, Silicon Dioxide, Ultraviolet Telescopes, Focusing, Lenses, Temperature Effects
Scientific paper
A device for calibrating the uniformity of the focal plane of a telescope is described. The device uses the 184.0 nm emission from a mercury lamp with an interference filter to remove unwanted mercury lines; it projects a rectangular array of illuminated spots through a system of six Spectrosil A lenses onto a detector. Changes in the absolute and relative position of these spots allow the axial alignment of the mirror system and linearity of response of the charge amplifiers on the detector to be monitored. The ability of this device to assess thermally induced defocusing effects is tested at 19.5 and 30 + or - 1 C, and an upper limit to the thermal coefficient of the refractive index of fused silica is computed. It is detected that there is no significant difference between the focal lengths measured at the two temperatures, and an upper limit of 880,000/C on dn/dT at 184.9 nm and 25 C to 95 percent confidence level is obtained.
Adams G. P.
Rochester G. K.
Sumner Timothy J.
Williams Rees O.
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