Window calibration for harmonic analysis of Raman spectra

In this paper, a method for calibrating a Raman spectrum within a measured wavelength window is presented. In support of a novel method for Raman analysis based on a FFT, the main peak needs to remain in the same position within the window in order to produce a repeatable transformation. This calibration uses multi-modal switching to efficiently and accurately tune the starting wavelength value. Upon completion of the calibration the main spectrum peak is in the center of the window. The results of the performed simulations show the calibration centering and stabilizing the main peak in less than 15 Raman spectra measurements within ±10 μs from the true center, with a sampling rate of 100 kHz.