摘要
介绍了一种基于现场可编程门阵列(field-programmable gate array,FDGA)的红外光谱信号采集系统实现方案,采用Altera公司的EP2C35系列的FPGA为控制核心,完成多路模拟开关切换、A/D转换、数据存取等功能,实现对64路红外光谱信号的采集.同时针对光谱仪输出的微弱直流信号,设计信号调理电路来抑制噪声,最后通过串口通信将数据传给上位机;简介了各功能模块的实现方案,并进行了实验验证,结果表明该系统的精度和可靠性高,并且最小可检测到0.23μV的微弱直流信号,实际信噪比达到45 dB.
An acquisition system of infrared spectrum signal based on field-programmable gate array（FPGA） is introduced. It is designed to implement data acquisition of 64-channel infrared spectrum signal. Altera＇s EP2C35 family chip is used as the control unit to realize the analog multiplexers switching, A/D conversion, data access. For weak DC signal of infrared spectrometer, a signal conditioning circuit is designed to restrain noise. Finally, the data is transmitted to upper computer by serial port. A brief introduction is given about every sub modules. By testing, the system has been validated to be reliability, which can detect minimal 0.23 μV weak DC signal and the actual signal to noise ratio can reach 45 dB.
出处
《大气与环境光学学报》
CAS
CSCD
2016年第4期313-320,共8页
Journal of Atmospheric and Environmental Optics
关键词
现场可编程门阵列
红外光谱
信号采集
多路模拟开关
field-programmable gate array
infrared spectrum
signal acquisition
analog multiplexers
