基于线阵CCD的小型光谱仪光度特性研究

基于线阵电荷耦合器件（CCD）的小型光谱仪具有便于携带和快速探测的优点，故特别适于现场检测应用。介绍一种自行研制的小型光栅光谱仪，它采用Czerny-Turner式光学结构，并用线阵CCD作为探测器。该光谱仪光度特性的实验检测结果证明：实验样机的光度精密度优于±0.04Abs，光度准确度为±0.04Abs（0Abs～1Abs）。实验分析了光谱仪的杂散光、光度噪声和基线平直度等指标对仪器光度准确度的影响。最后针对小型光谱仪的特点提出改善其光度特性的措施。

Photometric performance of miniature spectrometer-based on linear CCD

Miniature spectrometers based on linear charge couple devices (CCD) find wide applications in field detection because of their compact size and high-speed measurement.Photometric performances such as photometric reproducibility and photometric accuracy are most important specifications for a spectrometer. A self-developed miniature grating spectrometer was introduced,which incorporated the Czerny-Turner optical system and a lineaer CCD detector. The photometric performance of the prototype was tested in experiments according to the relevant standards in UV/Vis/NIR spectrophotometer. The results show that the photometric reproducibility of the spectrometer is better than ±0.04 Abs,and the photometric accuracy is ±0.04 Abs (0～1Abs). Moreover,the influence of stray light,photometric noise and baseline flatness of the spectrometer on photometric accuracy were analyzed with experiment results and theoretical calculation. Finally,the solutions to improve the photometric performance were discussed based on the characteristics of the miniature spectrometer.