Spectrophotometer, also known as spectrometer, is a scientific instrument that decomposes light with complex components into spectral lines. The measurement range generally includes the visible light region with wavelengths ranging from 380 to 780 nm and the ultraviolet region with wavelengths ranging from 200 to 380 nm. Different light sources have their own unique emission spectrum, so different luminous bodies can be used as the light source of the instrument.