双激发波长拉曼光谱仪的双光路集成设计

Integrated design of dual optical path for dual excitation wavelength Raman spectrometer

为了提高高端探测器的利用率与增强拉曼光谱仪同时对不同物质检测的适用性,将多个波长激发的拉曼光谱仪集成设计成为一个光谱仪,将具有重要的应用价值。提出了一种基于CT结构双波长(532nm和785nm)激发的双通道拉曼光谱仪设计方法。所采用的这种设计方法基于探测器的工作特点为实现双光路结构同时工作创造了条件,从而最大程度的增加了光谱测量范围,同时该方法也实现了对探测器的有效感光面像元的充分利用并且最大程度地实现了高光谱分辨率。优化结果表明对于532nm的激发波长,分辨率为5cm^(-1)、光谱范围达到80~4200cm^(-1);对于785nm的激发波长,分辨率为3cm^(-1)、光谱范围达到200~2300cm^(-1)。

In order to improve the utilization rate of high-end detector and enhance the applicability of Raman spectrometer to detect different substances at the same time,the integrated design of multiple wavelength excitation Raman spectrometer into a spectrometer will have important application value.A design method of dual-channel Raman spectrometer based on CT structure dual wavelength excitation(532nm and 785nm)is proposed.Based on the working characteristics of the detector,the design method adopted creates conditions for the simultaneous operation of the dual optical path structure,thus maximally increasing the spectrum measurement range.At the same time,the method also realizes the full utilization of the effective photosensitive surface pixels of the detector and the maximum realization of the hyperspectral resolution.The optimized results show that the resolution is 5cm^(-1)and the spectral range is 80~4200cm^(-1)for 532nm excitation wavelength.For 785nm excitation wavelength,the resolution is 3cm^(-1)and the spectral range is 200~2300cm^(-1).