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English Afrikaans Albanian Arabic Armenian Azerbaijani Basque Belarusian Bulgarian Catalan Chinese (Simplified) Croatian Czech Danish Dutch Filipino Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Irish Italian Japanese Korean Latvian Lithuanian Macedonian Malay Maltese Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swahili Swedish Thai Turkish Ukrainian Urdu Vietnamese

CaliBall I & II

CaliBall, a calibration artifact and mount for use in the Random Ball Test

Interferometric optical test precision is primarily limited by the interferometer transmission sphere quality. The CaliBall is a means of in-house transmission sphere calibration using the Random Ball Test. The CaliBall is designed so that it can be used immediately before or after a critical test of an optic without changing anything in the test setup other than inserting or removing the CaliBall itself.
Transmission spheres are factory calibrated, but shipping, handling, thermal and other environmental effects degrade the factory calibration precision. The CaliBall eliminates these uncertainties by calibrating the transmission sphere in the test set up, an assurance that the interferometric test results are precise.

 

SIMPLE TO USE

The CaliBall uses averaging of random patches of the CaliBall to calibrate transmission spheres exactly the same way surface roughness interferometers are calibrated by averaging random patches of a plane surface.

PRECISION EASY TO CALCULATE

The calibration procedure is simple and the precision of the results are easily calculated. See "A Practical Implementation of the Random Ball Test"

Other papers about the Random Ball Test and the use of the CaliBall are listed under “Technical Library”.

CALIBALL COMES IN TWO MODELS

Both CaliBall models are available directly from Optical Perspectives Group.

CALIBALL™ I

CALIBALL™ I
CALIBALL™ I is for either horizontal or vertical interferometer set ups but it requires an x-y-z stage to position the CaliBall center at the transmission sphere focus.

MORE INFO

CALIBALL™ II

CALIBALL™ II
CALIBALL™ II is for horizontal set ups which bayonet mounts into a typical Zygo or ESDI 4″ mount.

MORE INFO


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Caliball Users

CaliBall users include OptiMax, Edmund Optics, IOM, Fisba Optik, Zeeko, Goddard Space Flight Center, The Aerospace Corporation and others.

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OPG Customers