Which light source is most commonly used for fluorescent magnetic particle inspection?

The most commonly used light source for fluorescent magnetic particle inspection is ultraviolet (UV) light. In this method, magnetic particles that have been coated with a fluorescent dye are applied to the surface of the material being inspected. When exposed to UV light, the fluorescent dye glows brightly, making any defects visible against the darker background of the material being tested.

The use of UV light enhances the sensitivity of the inspection process, allowing for the detection of very fine cracks or surface irregularities that might not be visible under normal lighting conditions. The ability of the fluorescent particles to emit visible light when energized by UV radiation is what makes this method particularly effective for identifying defects in a wide range of materials.

Employing other light sources, such as infrared light or natural sunlight, would not provide the necessary contrast and visibility required to effectively inspect for flaws. Laser light, while powerful, is not typically utilized for this type of inspection due to its specific applications and properties that do not align with the needs of magnetic particle inspection. Thus, ultraviolet light is the standard and most effective choice for this procedure.