Editing Spectrophotometry (section)

{{Short description|Branch of spectroscopy}}

[[File:Spektrofotometri.jpg|thumb|Table-top spectrophotometer]]
[[File:Beckman Ir-1 Spectrophotometer, ca. 1941.jpg|thumb|Beckman IR-1 Spectrophotometer, {{Circa|1941}}]]
[[File:Beckman model db n009w2543.tiff|thumb|right | Beckman Model DB Spectrophotometer (a double beam model), 1960]]
[[File:Spectrophotometer-in-use.jpg|thumb|Hand-held spectrophotometer used in graphic industry<ref name="ISO12647-2">{{cite book
|title= ISO 12647-2: Graphic technology — Process control for the production of halftone colour separations, proof and production prints — Part 2: Offset lithographic processes
|location= Geneva
|publisher= [[International Organization for Standardization]]
|date= 2013
|page= 13
|language= en }}</ref>]]

'''Spectrophotometry''' is a branch of [[electromagnetic spectroscopy]] concerned with the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength.<ref name=":1">{{Cite web|url=https://www.nist.gov/programs-projects/spectrophotometry|title=Spectrophotometry|last1=Allen|first1=DW|last2=Cooksey|first2=C|date=Nov 13, 2009|website=[[National Institute of Standards and Technology|NIST]]|access-date=Dec 23, 2018|last3=Tsai|first3=BK}}</ref> Spectrophotometry uses [[photometer]]s, known as spectrophotometers, that can measure the intensity of a light beam at different wavelengths. Although spectrophotometry is most commonly applied to ultraviolet, [[Visible spectrum|visible]], and [[infrared]] radiation, modern spectrophotometers can interrogate wide swaths of the [[electromagnetic spectrum]], including [[x-ray]], [[ultraviolet]], [[Visible spectrum|visible]], [[infrared]], or [[microwave]] wavelengths.