Spectral calibration of the real-time data gathering and spectrum rebuilding system based on FPGA

Based on the spectrum rebuilding technology of spatially modulated imaging spectrometer, a real-time data gathering and spectrum rebuilding system of all reflection Fourier Transform imaging spectrometer is built on FPGA. It integrates interferogram sampling, spectrum rebuilding, data restoring, VGA display and data transmission on a single chip of FPGA and can make them accomplished in real-time. This paper presents the key technology and the spectral calibration study of this system. Using a mercury lamp as the calibration source, the calibration experiments have been carried on this FPGA-based system. After analysis the experimental results, a function of pixel number-wave number has been established, and the wave number resolution has been got, which is same to the resolution got by a computer-based system.