visual photometer


Also found in: Dictionary, Thesaurus, Medical.

visual photometer

[′vizh·ə·wəl fə′täm·əd·ər]
(optics)
A photometer in which the luminance of two surfaces is compared by human vision; it usually utilizes the Lummer-Brodhun sightbox or some adaptation of its principles.

photometer

Any instrument that measures photometric quantities such as luminance, luminous intensity, luminous flux, and illumination.