Fast Fourier Spectrometer Signal Acquisition Technology Based On ZYNQ

In recent years,infrared spectroscopy has been greatly developed and has been widely used in bioengineering,atmospheric detection,pollution detection and military equipment.Fourier transform spectrometer has a great advantage in the field of infrared detection because of its multi-channel and high spectral resolution.And then,it also puts forward more urgent requirements for the real-time,miniaturization and portability of Fourier transform infrared spectroscopy instruments.Real-time data acquisition and processing system is one of the key technologies of Fourier transform infrared spectrometer.This paper comprehensively explains the working principle of Fourier transform spectrometer and the design of software and hardware system for spectral data acquisition based on the development of small fast Fourier transform spectrometer.This paper first investigates the development process and current situation of fast Fourier transform spectrometer and its signal acquisition technology,compares the product parameters of the same type of domestic and foreign manufacturers,and analyzes the development trend of Fourier transform spectrometer.Then the basic theories of Fourier transform spectrometer are introduced,including the principle of interferometry,equal optical path difference sampling,fast Fourier transform etc.List the basic composition and classification of Fourier transform spectrometer,and the advantages and disadvantages of interferometers with various spectroscopic methods are analyzed,which are also used as the basis for selection of corner mirror torsion pendulum interferometers in this paper.At the same time,the performance evaluation parameters of spectrometers are also introduced.According to the technical requirements of spectrometer signal acquisition,the noise of infrared detector and the frequency range of interference signal are analyzed.then determined the form of interference simulation circuit and the operational amplifier chip.A set of blackbody temperature measurement and temperature control circuits are also designed,which can perform real-time radiation correction in the field.According to the requirement of measurement precision,the analog-to-digital conversion chip is selected and the hardware circuit is designed.Choose ZYNQ as the main control chip to complete the control and drive of signal acquisition,and the design of the main control core hardware circuit is realized.By analyzing the characteristics of ZYNQ software system architecture and the functional requirements of acquisition and control system.The software function is divided into software and hardware.the FPGA is used as the realization of peripheral drive,FFT algorithm,PID algorithm and other functions.ARM is used for system core control and interaction with host computer.This paper introduces the function design and implementation of each module in FPGA part,and the software design of the dualcore cooperative working mode in the ARM part.Finally,the function modules of Fourier transform infrared spectrometer signal acquisition system are tested and the collected data are analyzed.Verifies the reliability and high precision requirements of the interference analog acquisition and the black body temperature control circuit,and the feasibility of the ZYNQ software and hardware system design.This research provides a new solution for the engineering of embedded Fourier transform infrared spectrometer signal acquisition and processing system.