What is black light in magnetic particle inspection?

Ultraviolet light, UV light, or black light is light in the electromagnetic magnetic spectrum with a wavelength between 1,000 to 4,000 Angstroms (100 to 400nm). Any light with a wavelength shorter than 4,000A is invisible to the human eye. UV light is categorized by wavelength into three classes: A, B, and C.

What is black light intensity?

Ultraviolet light or “black light” is light in the 1,000 to 4,000 Angstroms (100 to 400nm) wavelength range in the electromagnetic spectrum. It is a very energetic form of light that is invisible to the human eye. Wavelengths above 4,000A fall into the visible light spectrum and are seen as the color violet.

How do you test black light intensity?

Light intensity measurements are made using a radiometer. A radiometer is an instrument that translate light energy into an electrical current. Light striking a silicon photodiode detector causes a charge to build up between internal layers.

What is the correct unit of black light intensity according to ASTM 1444?

2 Black Lights—Inspection black lights shall meet the requirements of 7.3. 5. The minimum acceptable intensity is 1000 4W/cm(10 W/m²) at the surface being examined.

What is fill factor in MPI?

The fill factor is the ratio of the cross-sectional area of the test piece to the cross-sectional area of the coil. fill factor = cross-sect. area of test piece / (÷ by) cross-sect.

What is magnetic particle inspection used for?

Magnetic Particle Inspection (MPI) is a non-destructive testing method that can detect surface and subsurface flaws in ferromagnetic materials. Magnetic particle inspection is often carried out to help determine an item’s fitness for use or conformity.

What is the white light requirement for conducting visual testing?

The inspector will use visible light with adequate intensity (100 foot-candles or 1100 lux is typical) for visible dye penetrant.

What does a black light do?

Black lights emit long wave ultraviolet (UV) light that allows materials and substances invisible to the human eye under normal lighting to fluoresce and produce visible color and light.

What is the required black light intensity at the part surface for the above exam?

1000 µW/cm2
Black Light Level Control – Black light intensity, minimum of 1000 µW/cm2, should be measured on the surface being examined, with a suitable black light meter.

What is ASTM 709?

Magnetic particle examination may be applied to raw material, semifinished material (billets, blooms, castings, and forgings), finished material and welds, regardless of heat treatment or lack thereof. It is useful for preventive maintenance examination. 1.1.

What is the name of the equipment used to check penetrant on the Magnaflux machine?

Magnaflux magnetic particle inspection
Magnaflux magnetic particle inspection (MPI) testing equipment is designed to be fast, reliable and high-value. Versatile and durable for industrial environments, Magnaflux wet benches, magnetic yoke and power pack come in a range of outputs, including AC, half-wave DC and full-wave DC.

What is PV fill factor?

Fill factor (FF) is the ratio of the actual maximum obtainable power, represented by the dark blue box, to the product of short circuit current Is/c and open circuit voltage Vo/c, represented by the light blue box.