Measurement Of Non-Optical Quality Mirror Surfaces With A 10.6 Micron Interferometer And Optimized Analysis Program

William F Hottmann; William B Lott; Joseph L. Hora; Patrick Woida

doi:10.1117/12.963570

20 August 1986 Measurement Of Non-Optical Quality Mirror Surfaces With A 10.6 Micron Interferometer And Optimized Analysis Program

William F Hottmann, William B Lott, Joseph L. Hora, Patrick Woida

Author Affiliations +

Proceedings Volume 0628, Advanced Technology Optical Telescopes III; (1986) https://doi.org/10.1117/12.963570
Event: 1986 Astronomy Conferences, 1986, Tucson, United States

Abstract

As part of a design study for a balloon-borne 3-m telescope for far-infrared and submillimeter astronomy, it has been necessary to test and evaluate the state-of-the-art for ultra lightweight primary mirror material candidates. In addition to being ultra lightweight (I0kg/m2), the primary mirror of this telescope must operate at -50°C with 300 diffraction limited performance. Evaluating the performance of mirror candidates has required cooling them in a low temperature test chamber while remotely monitoring the surface figure changes at several different temperatures. Some of the test panels were constructed with surfaces not smooth enough to provide recognizable 10p fringes suitable for analysis by standard Fringe techniques. To deal with this problem, we have successfully developed an analysis technique and software for a microcomputer which reliably generates surface maps from pathological interferograms. The programs operate rapidly and can provide a variety of outputs such as surface map averages, differences, Zernike polymonial coefficients, and RMS residuals during the tests. The system can also compensate for camera and test optics field distortions.

Citation Download Citation

William F Hottmann, William B Lott, Joseph L. Hora, and Patrick Woida "Measurement Of Non-Optical Quality Mirror Surfaces With A 10.6 Micron Interferometer And Optimized Analysis Program", Proc. SPIE 0628, Advanced Technology Optical Telescopes III, (20 August 1986); https://doi.org/10.1117/12.963570

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