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介绍了一种基于Czerny-Turner光路结构并采用谐波电机直接驱动光栅的小型快速近红外光谱仪的设计、仿真及初步测试结果.为了减小多次反射及衍射产生的杂散光,运用Cary理论进行光路布局与设计,使用光学软件TracePro进行了仿真,结果显示改进之后的结构有效抑制了系统的杂散光.为了减小体积并提高扫描光谱速度,采用谐波电机直接驱动光栅代替传统的电机传动正弦丝杆再驱动光栅的结构,在近红外光波段对样机性能进行了初步测试,并对葡萄糖水溶液进行了定性测量.初步测试结果显示:波长范围800~1 500 nm,扫描速度达到75 nm/s,光谱分辨率6 nm,波长准确性±0.5 nm,重复性≤1 nm,信噪比为1 000∶3,吸光度重复性≤0.008 AU,基线稳定性0.000 5 A/h,简单葡萄糖水溶液的定性测试结果比较清晰地反映了样品的特性.
The design, simulation and preliminary test results of a small fast near-infrared spectrometer based on the Czerny-Turner optical path structure with direct drive of the grating by a harmonic motor are introduced.In order to reduce the stray light caused by multiple reflections and diffraction, Cary theory The optical path layout and design were simulated with the optical software TracePro and the results showed that the structure after the improvement effectively suppressed the system stray light.In order to reduce the volume and improve the scanning spectral speed, the harmonic motor was used to directly drive the grating instead of the traditional motor drive sine The structure of the grating was re-driven, and the performance of the prototype was tested in the near infrared band and the aqueous solution of glucose was qualitatively measured.The preliminary test results show that the wavelength range of 800 ~ 1 500 nm and the scanning speed of 75 nm / s , Spectral resolution 6 nm, wavelength accuracy ± 0.5 nm, repeatability ≤ 1 nm, signal to noise ratio 1 000: 3, absorbance repeatability ≤ 0.008 AU, baseline stability 0.000 5 A / h, qualitative determination of simple glucose aqueous solution Test results clearly reflect the characteristics of the sample.