Calibration Package for PSM
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.
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.