Design of high speed miniature spectrometer based on FPGA

Abstract

In order to meet the demand for portable use of the spectrometer and improve the spectral acquisition rate, the driving circuit of the miniature fiber optic spectrometer was designed. The system uses Ibsen Photonic's FSV-101 miniature fiber optic spectrometer, which integrates the S11639-01 high sensitivity Complementary Metal-Oxide Semiconductor (CMOS) image sensor. The main control chip is Field-Programmable Gate Array (FPGA), and the analog-to-digital conversion of the CMOS output signal is performed by A/D conversion chip. The system uses FPGA to drive the CMOS timing and A/D conversion timing, and then communicates with the host computer through the serial port, transmits the spectral data to the host computer for dynamic display of the spectrum. In order to verify the overall performance of the system, laser light sources were used to conduct spectral acquisition experiments. The experimental results show that the system accurately outputs the spectral data of the light source, the spectral acquisition range is 200-1000nm, the frame rate is 111Hz, and the acquisition accuracy is 8bit, which has good practicability.