基于连续光谱光源的单色仪标定方法

发布时间：2018-10-17 09:43

【摘要】：单色仪在加工和安装过程中不可避免的存在误差,必须对其进行标定后才能使用。传统上采用汞灯的标定方法,波长数量有限,限制了单色仪的标定精度。在研究光栅单色仪原理的基础上,提出了一种基于连续光谱光源的单色仪标定方法,设计并搭建了标定实验系统,系统由宽波段光源、光源电源、滤光片、单色仪、光谱仪及计算机构成。采用卤钨灯作为光源,用光谱仪分别测量卤钨灯经单色仪后的辐射、直接测量卤钨灯的辐射,二者相比得到单色仪透过率函数,消除了卤钨灯辐射以及光谱仪响应函数的影响。在刻度盘的某一读数位置,获得单色仪透过率函数并进行归一化,并计算峰值波长,得到一组峰值波长和刻度盘读数的数据。该方法共采集了22组波长数据,用于单色仪的标定。分别采用8点、14点、18点、22点,采用线性拟合和二次拟合,得到了单色仪的波长与刻度盘读数的关系式。标定点数从8个(8点标定类似于汞灯特征谱标定)增加到22个,误差减小明显,将22点二次拟合的结果作为单色仪最终的标定结果。实验结果表明,采用连续光谱光源的单色仪标定方法获得的标定点数更多,标定结果优于传统的采用汞灯的标定方法。
[Abstract]:There are inevitable errors in the process of machining and installation of Monochromator, which must be calibrated before it can be used. Traditionally, the calibration method of mercury lamp is used, and the number of wavelengths is limited, which limits the calibration accuracy of Monochromator. On the basis of studying the principle of grating Monochromator, a calibration method of Monochromator based on continuous spectrum light source is proposed, and a calibration experiment system is designed and built. The system consists of wide band light source, filter, Monochromator, etc. Spectrometer and computer composition. Halogen tungsten lamp is used as light source, the radiation of halogen tungsten lamp is measured by spectrometer, and the radiation of halogen tungsten lamp is measured directly. Compared with halogen lamp, the transmittance function of monochromator is obtained, which eliminates the influence of the radiation of halogen tungsten lamp and the response function of spectrometer. At a certain reading position of the dial, the transmittance function of the monochromator is obtained and normalized, and the peak wavelength is calculated, and a set of data of the peak wavelength and the dial reading are obtained. A total of 22 sets of wavelength data were collected and used for calibration of Monochromator. By using linear fitting and quadratic fitting at 8, 14:00, 18:00 and 22:00 respectively, the relationship between the wavelength of Monochromator and the reading of dial is obtained. The calibration points are increased from 8 (8 points are similar to mercury lamp characteristic spectrum calibration) to 22, and the error is obviously reduced. The result of 22 points quadratic fitting is regarded as the final calibration result of Monochromator. The experimental results show that the calibration points obtained by the Monochromator with continuous spectral light source are more than those by the traditional calibration method using mercury lamp.
【作者单位】：哈尔滨工业大学;
【基金】：国家自然科学基金项目(61275095)资助
【分类号】：TH74

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