论文部分内容阅读
为提高光谱仪在光谱分析中样品浓度预测的准确性和精确度,结合闪耀光栅分光原理,对光栅分光光路进行优化,设计出应用双光栅代替原有单光栅进行分光的光路结构,并进行了理论分析和实验验证。对使用波段为200~800nm的光谱仪分光光路进行改进,应用使用波段为200~400nm,400~800nm的两光栅代替原有单光栅分光。根据地表水环境质量标准,实验中配置了煤油、0#柴油、97#汽油的CCl4样品溶液,分别应用光路改进前后的光谱仪对其进行实验扫描,取得样品溶液的激发、发射光谱图,并根据所得三维荧光光谱数据对样品进行定性定量分析。实验结果显示,单光栅光谱仪对样品浓度预测误差为0.014mg/L,双光栅光谱仪对样品浓度预测误差为0.008mg/L,即应用改进后的双光栅光谱仪所分析的实验结果误差比常规仪器误差小一倍,精确度提高了近一倍。这表明应用双光栅进行分光的光路优化设计可直接提高光栅光谱仪在光谱分析中的准确性和精确度。
In order to improve the accuracy and accuracy of the spectrometer in the prediction of the sample concentration in spectroscopic analysis, the grating optical path is optimized by combining the principle of blazed grating, the optical structure of the grating is designed by using double grating instead of single grating, and the theory Analysis and experimental verification. The spectrometer using the wavelength band of 200 ~ 800nm spectrometer optical path improvement, the use of the band 200 ~ 400nm, 400 ~ 800nm two grating instead of the original single grating spectroscopy. According to the standard of surface water quality, CCl4 sample solution of kerosene, 0 # diesel oil and 97 # gasoline was arranged in the experiment, and the samples were respectively scanned by using the spectrometer before and after the optical path improvement. The excitation and emission spectra of the sample solution were obtained. The resulting three-dimensional fluorescence spectroscopy data for qualitative and quantitative analysis of the sample. The experimental results show that the prediction error of the single-grating spectrometer is 0.014mg / L for the sample concentration and 0.008mg / L for the dual-grating spectrometer, that is, the error of the experimental results analyzed by the improved double grating spectrometer is lower than that of the conventional instrument Small doubling accuracy has nearly doubled. This shows that the optical path optimization using dual grating for spectral splitting directly improves the accuracy and precision of the grating spectrometer in spectral analysis.