Magnetic Particle Fluorescence Intensity Measurement
Magnetic particle fluorescence intensity measurement quantifies pigment density under UV light to monitor test medium wetting and standardize process sensitivity.
Physical-Chemical Mechanism of Action
Magnetic particle fluorescence intensity measurement determines the intensity of light emitted by pigments under UV radiation. These pigments are contained in the testing agents and flow with the metal. The intensity of the fluorescent light is proportional to the density of pigments in the metal.
Metallurgical Relevance & Risks in Welding
This measurement is used to ensure that the testing agents are correctly and sufficiently incorporated into the metal. Too low an intensity can mean not enough testing agent is present, leading to inaccurate or missing results. Too high an intensity indicates overdosing and can cause chemical reactions in the metal.
Workshop Practice & Action Points
To perform the measurement, the metal is exposed to UV light and the intensity of the fluorescent light is measured. The recommended intensity is usually between 100 and 200 mV. If intensity is low, add more testing agent; if high, reduce the amounts. It is important to perform the measurement under consistent conditions to get repeatable results.