微型近红外光谱仪的光谱信号采集系统设计

基于工业、农业、医药检测以及航空航天领域对微型近红外光谱仪的便携化使用需求,本文针对微型近红外光谱仪的嵌入式系统开展设计研究。光谱信号采集系统是微型近红外光谱仪嵌入式系统的一个重要组成部分,包括数据采集、存储以及实时传输等部分。本文以现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)为主控芯片,同步动态随机存取存储器(Synchronous Dynamic Random Access Memory,SDRAM)为数据存储芯片,配合FPGA芯片内的先进先出存储器(First Input First output,FIFO)进行数据的读写缓存。相对于传统的光谱信号采集方案,本论文提高了数据的存储容量、减小了系统的硬件体积便于近红外光谱仪的微型化。同时,SDRAM作为数据存储芯片相对于传统方案来说价格更为低廉,因此整个系统的硬件成本大大降低。通过编写相应的功能测试文件对系统的控制逻辑进行了验证,结果表明光谱信号采集系统的时序控制逻辑可行,能够正确控制光谱信号采集、大容量存储和实时传输等操作。

Spectral signal acquisition system of miniature near infrared spectrometer

Based on the portability requirements of miniature near infrared spectrometers in the fields of industry,agriculture,medical testing and aerospace,the embedded system of miniature near infrared spectrometers is designed and studied in this paper. The spectral signal acquisition system is an important part of the embedded system of the miniature near infrared spectrometer,including data acquisition,storage and real time transmission. FPGA is used as the main control chip,and the SDRAM is the data storage chip,combining with the FIFO in the FPGA chip to read and write data. Compared with the traditional spectral signal acquisition scheme,it increases the data storage capacity,reduces the system hardware volume,and facilitates the miniaturization of the near infrared spectrometer. At the same time,SDRAM is relatively inexpensive compared to the traditional spectral signal acquisition scheme,which will reduce the hardware cost of the entire system. The control logic of the system is verified by writing the corresponding functional test files. The results show that the timing control logic of the spectral signal acquisition system is feasible,and can correctly control the spectral signal acquisition,achieve large capacity storage,and real time transmission.