针对由器件光谱特性引起的光栅光谱仪测量误差问题, 提出了一种误差校正方法, 并对该技术中的理论模型、数值提取算法和精度、误差校正精度进行了研究。首先, 在深入剖析光栅光谱仪工作原理的基础上, 建立了光谱误差校正的理论模型; 其次, 在研究光栅、探测器、反射镜等核心器件光谱特性曲线典型特征的基础上, 提出了器件光谱响应参数提取算法, 并对该算法的精度进行了实验研究; 最后利用本文所建立的理论模型和数值提取算法对光栅光谱仪测得的溴钨灯光谱进行了校正, 并将校正后的结果与溴钨灯标准谱线进行了比较。实验结果表明, 本文所提出的数值提取算法的平均误差为039%, 校正后的光谱曲线与溴钨灯标准光谱曲线一致, 说明本文所提出的校正技术能够有效消除器件光谱特性引入的误差。

Aiming at the big measuring error from grating spectrometer caused by the devices′ spectral characterics, an error correction method is brought forward and validated. Firstly, the grating spectrometer′s principle is analyzed deeply and the theoretical model of error correction is built. Then, the spectral characteristics of key devices, such as grating, detector, mirror etc., are studied and the algorithm of numerical extraction is brought forward to acquire the value of each point on the spectral curve. Finally, the theoretical model and the method of numerical algorithm are used to correct the bromine-tungsten lamp′s spectrum which is obtained by the grating spectrometer. The result of the experiment shows that the mean error of the numerical extraction algorithm is only 039%, and the corrected spectrum is very close to the standard spectrum, which certifies that the correction method brought forward in this paper can eliminate the errors brought by the devices′ spectral characteristics.