Wavelength Calibration of Optical Multichannel Detectors in Combination with Single- and Double-Grating Monochromators

Abstract

For the measurement of a spectrum with an optical multichannel detector (OMCD), the relation N = N(λ) or λ = λ( N) between the channel number N and the wavelength λ must be known. For an ideal OMCD, N(λ) and λ( N) are completely defined by the physical parameters of the monochromator and the channel spacing of the OMCD. Series expansions N = N 0 + Σ k A k (λ – λ 0 ) k and λ = λ 0 + Σ k B k ( N – N 0 ) k are given for single-grating monochromators ( k = 1, 2, 3) and double-grating monochromators ( k = 1, 2). The validity of the series expansions has been checked experimentally and numerically for a double monochromator.