Spectroradiometer.

摘要

Light having a wavelength equal to or less than the cut-off wavelength of a sharp-cut filter (12) is cut off so that an output of a photo-sensitive device (10) corresponds to a stray light component when a wavelength control device (11) sets the wavelength equal to or less than the cut-off wavelength of the sharp-cut filter (12). By subtracting the stray light component from the output of the photo-sensitive device (10) when the photo-sensitive device (10) is to be measured an intensity of light having a predetermined wavelength, the stray light component can be removed from dispersion outputs of the spectroradiometer.