noun
spectrophotometry
Technical term used in physics, chemistry, and related fields for measuring light intensity across wavelengths.
この実験では分光測光法を用いて溶液の濃度を測定した。
In this experiment, we measured the concentration of the solution using spectrophotometry.
Compound of 分光 (spectroscopy) and 測光 (photometry). The exact historical derivation is uncertain; the spelling is conventionally associated with the technical meaning.