A common non-destructive testing (NDT) technique for crack detection uses dye-penetrant.  In this method, dye remains in the cracks after cleaning, which is then observed when it fluoresces under ultra-violet light.

To suit this application, and others where ultra-violet light is required, Olympus offers a high power UV light source which is compatible with all light guide cables and fiberscopes.  Liquid light guide cables are recommended for best  UV results.  

The light source is capable of transmitting white light as well as UV and a selection switch allows the user to change the illumination mode.  

Specification:

Lamp type	200W mercury pressure lamp
Weight	7.5kg (16.5lb)
Dimensions	265x150x256mm (10.4x5.9x10.0")
Power supply	100-240V AC, 50-60Hz

UV Fiberscope  

Glass fibers used in borescopes and standard specification fiberscopes attenuate UV light and can only therefore be used to view the fluorescing images, not to transmit UV illumination.  In order to transmit ultra-violet illumination and view the images with one instrument, a special feature fiberscope is required.  

The IF11D4-20UV fiberscope is available with or without an internal channel and features a quartz fiber bundle for effective ultra-violet illumination.  The 11.3mm (0.44") diameter instrument is available in two lengths - 2.0m or 3.0m (6.6’ or 9.8’) and ,where specified, the internal channel can be used to introduce the dye and processing fluid necessary in this application.