Types of Lighting

Incandescent

produced by heating a thin wire filament (usually tungsten) w/ an electrical current until it glows

Which type of light source often results in warm, yellowish light?

Incandescent

Infrared (IR)

a type of invisible electromagnetic radiation w/ wavelength longer than visible red light but shorter than microwaves

Which type of light source is within the 700nm-1mm wavelength?

IR

What benefit could IR provide during serial number restoration?

helps to highlight restoration

What is the downside of using IR during serial number restoration efforts?

picks up additional background noise, light reflects off of the imperfections

Ultraviolet (UV)

a form of electromagnetic radiation w/ wavelengths shorter than visible light but longer than x-rays

Which type of light source is within the 100nm-400nm wavelength?

UV

Which light source is invisible to the human eye?

UV

Which type of light source can be particularly useful during magnetic particle inspection?

UV

Fluorescent

an energy-efficient, artificial lighting source that produces visible light by using electricity to excite mercury vapor w/n a gas-filled glass tube

Angle of Incidence

the angle between a ray incident on a surface & the line perpendicular to the surface at the point of incidence

True or False: different lighting & angle have no affect on the ability to visualize characters during serial number restoration

False