设计制作了一种基于线阵CCD和USB 2.0数据采集系统的高速便携式近红外光栅光谱仪。给出了该光谱仪的光学系统设计,分析了其测控系统的设计方案及特点,并给出了具体实现方法。分光系统采用平面光栅为分光元件,球面反射镜为成像物镜,实现了平谱面和较小的谱线弯曲(＜42%),利于CCD探测器接收。测控系统采用现场可编程门阵列(FPGA)和USB 2.0接口技术,不仅优化了硬件电路结构,而且大大提高了数据采集速度,最快可达2 MB/s。对测量结果进行分析,并给出了波长标定结果。实验结果表明,该光谱仪高速便携,波长精度可达1 nm。

A portable high speed near-infrared grating spectrometer is designed based on a linear CCD and a USB 2.0 data acquisition system. The optical system of the spectrometer is introduced and the design scheme of the measurement and control system is analyzed,then the concrete implementation methods are given. By taking a plan grating as a beam splitter and a spherical mirror as an imaging objective,the splitting system realizes a spectral plane and a small spectral band(＜42%),which is conductive to the signal receiving by a CCD detector. Moreover,a Field Programming Gate Array(FPGA) and the USB 2.0 technology are used in the measurement and control system to optimize the hardware structure,so the data acquistion speed has been improved to 2 Mb/s in the best. Finally,this paper analyzes measuring results,which shows that the portable spectrometer can offer the wavelength accuracy up to 1 nm.