Griesmann, U.
and Burke, J.
(2012),
Calibrating the sag due to gravity of horizontal interferometer reference flats, Interferometry XVI: Techniques and Analysis, Monterey, CA, [online], https://doi.org/10.1117/12.929968
(Accessed October 10, 2025)
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Calibrating the sag due to gravity of horizontal interferometer reference flats
Published
Author(s)
, Jan Burke
Abstract
We describe a method for measuring the deflection due to gravity (sag) of horizontally mounted reference flats of phase shifting interferometers. The planarity of a test flat can be measured sag- free while supporting it iso-statically on a suitable visco-elastic polymer foam. A sag map is obtained when the sag-free flatness error is subtracted from the flatness error of the same flat held at its edge.Proceedings Title
Interferometry XVI: Techniques and Analysis
Volume
8493
Conference Dates
August 13-15, 2012
Conference Location
Monterey, CA
Conference Title
SPIE Optics & Photonics 2012
Pub Type
Conferences
Download Paper
Keywords
Optical interferometry, Reference flat calibration, Sag
Citation
Issues
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Created September 13, 2012, Updated June 23, 2020