HOME Ultraviolet Light (Black-Light) Principle of UV Light

UV Light radiates UV-A (center of wave distribution is 365 nm) and makes fluorescent materials in the flaw indication emit visible light. UV Light is used for fluorescent penetrant testing (PT) and fluorescent magnetic particle testing (MPT), and also used for contamination check and leak check by observing fluorescence emission from skin, fiber, resin, oil etc. on the object.

Observation under Ultraviolet (UV) Light
※ Click above illustration to view animation of Observation under UV light

Halation eliminated filter

Developed new halation filter that eliminates obstacle visible light (404 nm-414nm and 680nm-780nm).
This new filter realizes better observation of workpiece under UV light without halation.
Photograph below shows clear flaw indication with the new filter.


with conventional filter


with new filter