The American Society for Nondestructive Testing (www.asnt.org) defines NDT as the examination of an object with technology that does not affect the object’s future usefulness. The term NDT includes many methods that can:
- Detect internal or external imperfections
- Determine structure, composition or material properties
- Measure geometric characteristics
Liquid Penetrant Testing (Dye penetration Process or Fluorescent Penetrating Agent), Magnetic Particle Testing and Visual and Optical Testing are test methods used to detect defects in materials with the aid of optical radiation or light. The light levels used in these operations are critical to the integrity of the inspection process so radiometric and photometric measurements are made for quality control purposes. American Society for Testing and Materials (ASTM), MIL and DIN standard practices exist to help ensure uniformity in these examinations.
For highest sensitivity, a fluorescent dye is used as the penetration liquid and the test is carried out under UV-A ultraviolet "blacklight" light sources.
Gigahertz-Optik has developed the XD-9502 two-channel detector head (W/m2 and lx) for this application according to the DIN 5032, DIN 5031 and DIN EN 1956 requirements.
Additional information from our Products section:
Multi-Channel Illuminance/Irradiance Light Detector: XD-9502
Possible Optometer: X11, X98
Additional information from our Tutorials section: VI.9. Nondestructive testing
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