Infrared Telescope Technology Testbed primary mirror test results

Details Infrared Telescope Technology Testbed primary mirror test results Infrared Telescope Technology Testbed primary mirror test results

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356..727l&link_type=abstract

Proc. SPIE Vol. 3356, p. 727-734, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Computer Science

Performance

Scientific paper

An 85 cm aperture beryllium mirror was fabricated as part of the IR Telescope Technology Testbed (ITTT), a facility to which the SIRTF flight telescope will be traceable. The ITTT was developed to demonstrate that diffraction-limited performance at a wavelength of 6.5 micrometers is attainable from an ultra-lightweight meter-class beryllium telescope operating at a temperature of 5.5K. Cryo-null figuring was employed to meet the requirements for the shape of the primary mirror at its operating temperature over an aperture of 79cm. The results of this process will be presented, including the repeatability of the surface through cryogenic temperature cycling. Modeling of system performance using the residual figure error will be described. Image-based methods were used to characterize a turned up edge that is too steep to be measured with an interferometer.

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