Measurement of optical flatness using electronic levels

Julius Yellowhair; James Howard Burge

doi:10.1117/1.2831131

1 February 2008 Measurement of optical flatness using electronic levels

Julius Yellowhair, James Howard Burge

Author Affiliations +

Optical Engineering, Vol. 47, Issue 2, 023604 (February 2008). https://doi.org/10.1117/1.2831131

Abstract

Conventional measurement methods for large flat mirrors are generally difficult and expensive. In most cases, comparison with a master or a reference flat similar in size is required. Using gravity, as in modern pendulum-type electronic levels, takes advantage of a free reference to precisely measure inclination or surface slopes. We describe using two electronic levels to measure flatness of large mirrors. We provide measurement results on a 1.6-m-diameter flat mirror to an accuracy of 50 nm rms of low-order Zernike aberrations.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Julius Yellowhair and James Howard Burge "Measurement of optical flatness using electronic levels," Optical Engineering 47(2), 023604 (1 February 2008). https://doi.org/10.1117/1.2831131

Published: 1 February 2008

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