In this paper, a new calibration method for accurate long focal-length
measurements, based on Talbot
interferometry, is presented. Error analysis is derived in detail by the
numerical method, and an effective way to improve the accuracy is proposed. By
this method, the systematic errors that are the main factors effecting accuracy
are calibrated and reduced. Both simulation and experiments have been carried
out to prove the effectiveness and advantages of the proposed method as compared
to conventional approaches. The experimental results reveal that the relative
error is lower than 0.02%, and the repeatability is better than 0.05%. This
method is especially useful for measuring long focal-length lenses.
© 2012 Optical Society of America
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