A Control Algorithm for Near-Infrared Spectra Detection System Based on Grating Light Modulators

Abstract

In this paper, a novel control algorithm for near-infrared spectra detection system based on grating light modulators is proposed. Firstly, the principle of this novel control algorithm is analyzed theoretically, and the encoding and decoding process of two scanning modes based on the control algorithm are obtained. Secondly, the numerical simulation is carried out to evaluate the effect of this control algorithm on the signal-to-noise ratio (SNR) of the spectra detection system. The difference between the SNR of the system under different scanning modes is acquired. When the number of pixels M in a unit becomes larger, the stage number of driven voltages is smaller. In the end, related experiments have been set up, and the feasibility of the control algorithm is validated. By using the novel control algorithm, the detected spectrum of 1340nm narrow band filter could be reconstructed well and the deviations of the peak wavelengths under both scanning modes based on this algorithm are less than 1nm. Furthermore, the novel Hadamard transforms scanning mode based on this control algorithm could not only decrease the complexity of the control circuit but also increase the SNR of the spectra detection system.