Monochromatic Light Unit (Monolight)

Product Description

 Monochromatic Light Unit:  In order to obtain precise measurement and contrasting fringe patterns when using optical flats to assess the flatness of processed components, the field of view must be illuminated with monochromatic light, that is, light in which the rays have virtually the same wavelength.

The Lapmaster Wolters monochromatic light units use a low pressure sodium light source which gives very economic running costs and a long operating life. The effective monochromatic wavelength is 5896A, so λ/2 is approximately 0.3 microns.
On the standard monochromatic light unit, in front of the lamp is an opalescent diffusing screen with a straight line engraved across its face. By suitable adjustment of the flat, work and eye position, the reflection of the engraved line provides a
straightness reference with which the bands can be compared.