200 liner per mm version of Ronchi Rulings

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Pyser-SGI has added to its range of Ronchi rulings with the introduction of a 200 liner per mm version.

This 200 line-pairs per mm all glass slide can be used with microscope or camera systems to check for resolution and distortion.

The Pyser-SGI range of transmission gratings are produced in various sizes as a vacuum deposited chrome image on glass, or as a photographic image on film, to give very precise line patterns, and are available with a variety of pitches to suit the measurement precision required.

The use of two different pitch gratings superimposed and aligned will produce a Moiré fringe pattern. Changes to this pattern provide a means of measuring stress or distortion. Typical applications include distortion analysis, weld stress analysis, focal stability, surface flatness and optical conformance.