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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, EASY TO CALCULATE

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.
 

Simple CaliBall Instructions

CaliBallTM is a 25.4 mm diameter, silicon nitride ball and kinematic mount used to calibrate phase-measuring interferometers by determining the errors in the transmission sphere reference surface.


The CaliBallTM is located with its center at the focus of the interferometer transmission sphere and aligned to better than one fringe.


A measurement of the ball is taken, the ball picked up, arbitrarily rotated and replaced in its mount.


The center of the ball will return to its original position due to the kinematic mount. Another measurement of the ball is then taken.


This process is repeated about a dozen times and the interferograms averaged.


The average represents the errors in the transmission sphere and interferometer because the ball is extremely round and the small, uncorrelated imperfections of the ball average to zero.


The calibration can be done in as little as 10 minutes and the results are difficult to dispute.

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.

PURCHASE PRODUCT

CALIBALL™ II

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

PURCHASE PRODUCT

Scroll down to bottom for a bibliography of archival CaliBall papers.


 

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Case Studies & Testimonials

  • "You are always responsive and give us lots of useful information!!"

    Dr. Shaojie Chen
    Dunlap Institute for Astronomy and Astrophysics
    University of Toronto

     

  • "As always we are very much loving the instrument, I personally love the camera upgrade from what I'm used to!"

    Weslin Pullen
    Hart Scientific Consulting International, LLC
    Tucson, Arizona

     

  • The PSM is an ideal tool for finding the center of curvature of a ball or the axis of a cylinder. The question is for how small a ball or cylinder can the PSM do this?

    The smallest article that was readily available was a piece of monofilament 8 pound test fishing line that was 290 μm in diameter. There was no problem finding the axis of the fishline, and separating the Cat’s eye reflection from the surface from the confocal reflection of the axis. The experiment was done with a 5x objective, and the result would have been even more definitive using a 10x objective.

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Worldwide Representatives

FOR SALES IN CHINA PLEASE CONTACT:

FOR SALES IN CHINA PLEASE CONTACT:
OPTurn Company Ltd
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Beijing, China
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FOR SALES IN ALL OTHER ASIAN COUNTRIES PLEASE CONTACT:

FOR SALES IN ALL OTHER ASIAN COUNTRIES PLEASE CONTACT:

清 原 耕 輔   Kosuke Kiyohara
清原光学 営業部   Kiyohara Optics / Sales
+81-3-5918-8501
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Kiyohara Optics Inc.
3-28-10 Funado Itabashi-Ku Tokyo, Japan 174-0041

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Armstrong Optical

+44(0) 1604 654220

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