Analysis of a Hadamard Transform Near-infrared Spectrometer Basedon Grating Light Modulator

摘要

This paper proposes a novel Hadamard Transform near-infrared spectrometer based on MOEMS(Opticalmicro-electro-mechanical system ) grating light modulator. A new method that grating light modulator combined with asingle near -infrared detector to detect spectrum is applied. The programmability of the grating light modulator lineararray is used to implement a Hadamard Transform encoding masks. Firstly, optics theory has been used to analyze theessential principle of the spectrometer and the optical principle of grating light modulator. Then, It is theoreticallyproved that the Hadamard Transform near-infrared spectrometer can reconstruct spectrum effectively and have a highsignal noise ratio. Finally, a new structure of the grating light modulator is given. Results of the software simulationshow that 5.5V maximum actuating voltage and 5 kHz response frequency are suitable for a miniature, portable,cost-efficient spectrometer.