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Calibration Package for PSM

OPG offers a NIST traceable square wave grating with 4 lp/mm spacing for use in calibrating the lateral scale of the PSM and other optical instruments.
Price / kg:

The package includes a 64 mm square glass substrate about 1 mm thick with a 25 mm square chrome square wave line pair pattern centered on the substrate, a Calibration Certificate from Applied Image showing traceability to NIST and a sheet with the actual Calibration data. The package is priced at $460 plus $40 shipping and handling. 

In the early days of the PSM, Optical Perspectives Group was able to specify the lateral scale of the video images produced by the PSM because we used a particular camera and a known set of objectives. As improvements have been made in pixel size in cameras and objectives from different manufacturers are used, the lateral scale is no longer simple and obvious. The square wave grating makes it possible to be sure the magnification is set correctly for crucial measurements.

Simply adjust the Calibration Factor in the PSM Align software to match the square wave pattern line pair spacing.


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Case Studies & Testimonials

  • How small can the PSM be used for centering on a cylindrical axis?

    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.

  • Why is proper alignment so important?

    Here is a case of a very happy customer due to better optics.

    A few days ago an astronomer friend of mine commented that he had gotten the optics of his telescope improved and the improvement reduced the time it took to get data by a factor of 3. For an astronomer this is a dramatic improvement since observing time on large telescopes can cost thousands of dollars an hour.

    My friend did not say how the optics had been improved, but the important point is that better optics, whether due to figure errors, mounting or alignment mean more productive optics. I generally think of better optics as a better product leaving the manufacturing facility without thinking about how much the better optics mean to the productivity of the customer.