Patent ID: 8767206

Claim:
A spectral characteristic measuring device comprising a spectrometer and a control device, wherein said spectrometer includes, a light shielding body provided with an opening, a light receiving unit in which a plurality of light receiving elements are arrayed in a direction along one axis and that outputs a signal from each of said light receiving elements according to an irradiation light quantity, and an optical system that disperses the light passed through said opening according to a wavelength to form a dispersion image on said light receiving unit; and said control device includes, a storage unit for storing wavelength information indicating a correspondence relationship between said plurality of light receiving elements and wavelengths of piece of lights irradiated on said plurality of light receiving elements, an intensity distribution acquiring portion for acquiring a first intensity distribution related to a first dispersion image and a second intensity distribution related to a second dispersion image based on the signal outputted from each of said light receiving elements when a monochromatic light is passed through said opening and said first dispersion image related to a primary diffracted light and said second dispersion image related to a secondary diffracted light are formed on said light receiving unit, a first calculation portion for calculating an estimated intensity distribution related to said second dispersion image from said first intensity distribution according to a predetermined relational expression, a second calculation portion for calculating a change amount related to said wavelength information corresponding to a shift amount between said estimated intensity distribution and said second intensity distribution with respect to a direction along said one axis by a comparison of said estimated intensity distribution and said second intensity distribution while relatively moving at least one of said estimated intensity distribution and said second intensity distribution in a direction along an axis corresponding to a direction along said one axis, and a correction portion for correcting said wavelength information according to said change amount.