Computer-controlled figuring and testing

Tapio K. Korhonen; Timo Lappalainen

doi:10.1117/12.19236

1 July 1990 Computer-controlled figuring and testing

Tapio K. Korhonen, Timo Lappalainen

Author Affiliations +

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19236
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

Technology developed for computer-controlled mirror manufacturing is described. The polishing tool is equipped with electromagnetic force actuators to regulate the local polishing forces according to the measured mirror errors. Optical testing with the interferometric modification of the Hartmann test and a CCD-camera as a detector allow accurate and fast measurement with high sampling frequency. Air turbulence and vibration effects are minimized in the workshop which is blasted into the bedrock and equipped with good thermal insulation.

Citation Download Citation

Tapio K. Korhonen and Timo Lappalainen "Computer-controlled figuring and testing", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19236

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