Patent ID: 7471391
Filing Date: 2008-12-30
Classification: G01J

Abstract:
1. A method for calibrating spectral characteristics of a spectral analyzer having an incident slit, a light sensor comprising multiple pixels, and a dispersing and imaging element producing a dispersed image of said incident slit on said sensor array, the method comprising: obtaining a measured pixel output by measuring a plurality of line spectra of known wavelengths; determining coefficients which define two functions respectively approximating a relation of differences of a center wavelength and a half bandwidth of each pixel in said light sensor from a center wavelength and a half bandwidth of standard spectral characteristics of the pixel to the pixel number; estimating spectral characteristics of each pixel based on said differences of the center wavelength and the half bandwidth of the pixel given by said functions with the coefficients determined respectively and said standard spectral characteristics of the pixel; and wherein said coefficients are determined so that a pixel output estimated based on said estimated spectral characteristics of each pixel and said known wavelengths of said line spectra matches said measured pixel output.