A spectrometer which enables the intensity of several spectral bands of radiation to be measured one after the other in time, i.e. sequentially.
PAC, 1995, 67, 1725. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)' on page 1729 (https://doi.org/10.1351/pac199567101725)