photospectroscopy
/ˌfəʊtə(ʊ)spɛkˈtrɒskəpi/noun
Spectroscopy in which photographic images are obtained of the spectra produced.
Origin
Late 19th century; earliest use found in William de Wiveleslie Abney (1843–1920), civil servant and photographic scientist. From photo- + spectroscopy.