From Glossary of Meteorology
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A photometer that measures the intensity of radiation as a function of frequency (or wavelength) of the radiation.

In one design, radiation enters the spectrophotometer through a slit and is dispersed by means of a prism. A bolometer having a fixed aperture scans the dispersed radiation so that the intensity over a narrow wave band is obtained as a function of frequency.
See Dobson spectrophotometer.