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Wavelength Effects on Performance

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Wavelength Effects on Performance

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  • Author: Gregory Hollows, Nicholas James
Different wavelengths bend at different angles as light passes through a medium (glass, water, air, etc.). This is commonly observed when sunlight passes through a prism and creates a rainbow effect; shorter wavelengths are bent more than longer ones. This same effect creates problems when trying to resolve details and gain information in imaging systems. To avoid this issue, imaging and machine vision systems commonly use monochromatic illumination, which involves only single wavelengths or narrow bands of the spectrum. Monochromatic illumination, e.g. from a 660nm LED, practically eliminates what are known as chromatic aberrations in an imaging system.

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