#### Term Ulbricht Sphere

Term definition

Also known as an Integrating sphere. A hollow sphere coated internally with a white diffusing material and openings for an incident beam, a specimen, and detector. The sphere is used to measuring the diffuse reflectance or transmittance of objects.

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#### Term Ultraviolet (UV)

Term definition

Electromagnetic radiation with wavelengths shorter than visible light and longer than X-rays, and frequencies higher than visible light and less than X-rays. It has the range of wavelengths from 10 nm to 400 nm, where $1\text{\hspace{0.17em}}\text{nm}=1×{10}^{-9}\text{m}$ , and frequencies between , where 1 Hz (one hertz) is a one cycle per second.

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#### Term Unpolarized light

Term definition

Light in which the electric field vector is oriented in a random, unpredictable fashion.