Cosine corrector DEF

Cosine Corrector

A cosine corrector is an optical diffuser, used to captures the light upon a surface over a 180 degree angle. The surface of cosine correctors responds in accordance with Lambert’s cosine law: the amount of light falling upon the cosine corrector is proportional to the cosine of the light beam’s incident angle.

At a 60 degree angle, only half the intensity is measured as opposed to 100% at a 0 degree angle. A typical application of a cosine corrector is the illuminance measurement of a lighting situation.

How are you measuring?


Consumers are used to enjoy top-quality displays in their mobile phones, tablets, laptops and even cars. Emerging technologies such as lighting surfaces for office and home illumination are expected to look equally perfect. Both displays and luminous surfaces are the main application areas for imaging colorimeters.