基于DMD的小型近红外光谱仪原理及优化分析

数字微镜器件小型近红外光谱仪器具有检测速度快、灵敏度高、无损伤检测、仪器小型化等优点，广泛应用于化学成分分析和质量检测。然而，作为仪器设计的前提，整个光谱范围的光学优化设计是系统的难点。文中研究了基于数字微镜器件小型近红外光谱仪的光谱成像系统的理论设计方法。该方法采用双配消像差透镜，结合几何像差理论，对小型数字微镜器件近红外光谱仪的设计进行了优化，以降低整个系统的像差。然后，利用光学仿真软件对准直接成像系统进行光学仿真。最终达到设计仿真要求。仿真结果表明，该分光计的整体尺寸小于150 mm×150 mm×150 mm，在工作波段1000~1700 nm范围内，其分辨率优于15 nm。因此，该方法能满足设计要求，在实际应用中具有广阔的应用前景。

Principle and optimum analysis of small near-infrared spectrometers based on digital micromirror device

The DMD small near-infrared spectroscopy instrument is widely used in chemical composition analysis and quality inspection for its advantages of fast detection speed, high sensitivity, no damage detection, and miniaturization of portable instruments. However, as the premise of instrument design, optical optimization design of the whole spectral range is the hard work of the system. In this paper, the theoretical design method of the spectroscopic imaging system based on the small near-infrared spectrometer of DMD was studied. The method was designed by using the double-dispensing anti-aberration lens and combining the geometric aberration theory to optimize the design of a small DMD near-infrared spectrometer to reduce the aberration of the entire system. Then, the optical simulation software was used to align the direct imaging system for optical simulation. And ultimately achieve the design simulation requirements. Simulation results indicate that the whole size of the spectrometer is less than 150 mm×150 mm×150 mm, and the resolution is better than 15 nm in the range of 1000-1700 nm in the working band. Therefore, the proposed method can meet the design requirements and has broad application prospects in practical applications.