Ultraviolet light is electromagnetic radiation and is measured in units of energy per time. The UV wavelength between 320 nm and 400 nm causes maximum fluorescence of the penetrant dyes. The filter transmits ultraviolet between 320 nm and 400 nm for the inspection requirements. The filter is a special material that prevents the passage of short wavelength ultraviolet and long-wavelength visible light. Most UV light must be warmed up for at least 15 minutes before performing the inspection. The housing, which may be metal or plastic, hold the bulb and filter and prevent leakage of unwanted visible light.
A high pressure, mercury vapor, blacklight bulb, which is the common type used in NDT, requires a housing, filter, regulating ballast or transformer, and connecting cables or wires.
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These filters have to be free from cracks, chipped pieces, or any other defects. Nondestructive Testing Inspection Blacklight (UV-A Blacklight)īlacklight bulbs are operated with filters and should not be used without filters. The bulb emits various wavelengths however, the bulb filter allows ultraviolet light (320-400-nm wavelength) and a minor amount of visible light of the short wavelengths and suppresses the transmission of visible light of the longer wavelengths. The source of ultraviolet light is often a mercury arc bulb with a filter. Ultraviolet-C (UV-C), “C” band ultraviolet is a hard ultraviolet or short wavelength (4 to 270 nm) used in germicidal or sterilizing lamps.Ultraviolet-B (UV-B), “B” band ultraviolet is a medium wavelength (270 to 320 nm) used for examining minerals and in suntan lamps.Ultraviolet-A (UV-A), “A” band ultraviolet is a soft ultraviolet or long wavelength (320 to 400 nm), commonly called “blacklight.” UV-A has the smallest bandwidth of the ultraviolet range.The ultraviolet range is divided into three bands: Ultraviolet (UV-) light is electromagnetic radiation with a wavelength ranging between X-rays and visible light. When we turn on a blacklight bulb in a dark room, the bulb produces a purplish glow associated with ultraviolet light that we do not see. The blacklight bulb is the type of bulb that produces Ultraviolet-A light. However, we see its effects on our skin, such as sunburns and suntans. The light above violet is ultraviolet light. The human eyes can see visible light in the spectrum ranging from red to violet. They are used to excite fluorescent penetrant or magnetic particle solution in a range visible to the eye. Typical blacklight units used in nondestructive inspection provide an intensity of 1000 micro-watt/cm2 at 15 inches from the face of the blacklight filter. These lights are used in applications in which extraneous visible light must be minimized, mainly to observe fluorescence, the colored glow that many substances give off when exposed to UV light. Blacklight lamp emits long-wave UV ‑ A radiation and little visible light. Blacklight (or Ultraviolet Light “UV-Light”) is electromagnetic radiation with 320-400 nm wavelengths.
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