The present invention relates to the technical field of computational reconstructive spectrometers, and in particular, to a spectral segment computational
reconstruction method, a
spectrometer, and a device, which are used for performing
spectral reconstruction on an object under test, of which a
wavelength range falls within a set interval X. The spectral segment computational
reconstruction method comprises: performing, in order, computational reconstruction on spectral segments of set intervals x1, x2, …, xk, to respectively acquire spectral feature information sets y1, y2, …, yk of the object under test in corresponding
wavelength ranges; and performing splicing and reconstruction on the spectral feature information sets y1, y2, …, yk of the corresponding
wavelength ranges, to obtain complete spectral feature information Y of the
wavelength range of the object under test in the set interval X. The method can greatly reduce the computing power requirements on a computing device and reduce the bandwidth requirements on a single
light source, so that a spectral
sensing system can be further miniaturized and low in cost. In addition, customization and non-
continuous spectrum analysis are facilitated, and product
power consumption is reduced.