光谱学与光谱分析, 2012, 32 (4): 1127, 网络出版: 2012-04-16  

Czerny-Turner正交型光栅单色仪的波长校准

Wavelength Calibration Research on the Automatic Grating Monochromator for Orthogonal Czerny-Turner Structure
作者单位
1 中国科学院长春光学机密机械与物理研究所, 吉林 长春130033
2 中国科学院研究生院, 北京100049
摘要
研究了Czerny-Turner正交型光栅单色仪的波长校准技术。 结合单色仪的结构参数和特点, 提出以符合光栅方程的正弦曲线作为仪器出射波长的校准方程, 基于最小二乘法原理给出校准方程的拟合残差表达式, 由于校准方程的非线性, 应用二维Nelder-Mead单纯形法求解拟合残差的待定系数, 建立了波长与光栅转角的精确表达式, 并通过实验验证了该算法的准确性。 结果表明, 经过校准的单色仪波长定位精度小于0.1 nm, 比设计要求提高一个数量级。 该方法在Czerny-Turner正交型光栅单色仪的波长校准过程中, 应用简单, 容易实现, 只需稍加修改步进电机的控制程序, 即可完成对仪器出射波长的快速实时校准, 实用性强。
Abstract
The wavelength calibration research on the automatic grating monochromator for orthogonal Czerny-turner structure was investigated. Combined with the structure parameters and characteristic of this monochromator, the sinusoid that accords with the grating equation was proposed as the function of the wavelength calibration. Based on the principle of the least square method, the formula of the fitting residual error of the wavelength calibration was given. Using the Nelder-Mead simplex method, the undetermined coefficient of the fitting residual error was solved, which founded the precise formula between the wavelength and the grating turning angle. The accuracy of the method was verified through the experiment. The calibrated wavelength precision of the monochromator is less than 0.1 nm, which satisfies the application requirement. Applied in the wavelength calibration of the automatic grating monochromator with orthogonal Czerny-Turner structure, this method is simple to apply and easy for implementation. Using this method, the wavelength calibration can be realized quickly and real-timely, but it is only needed to modify the control program of the stepping motor slightly, which shows a better practicability.

寇婕婷, 巴音贺希格, 唐玉国, 齐向东, 于宏柱. Czerny-Turner正交型光栅单色仪的波长校准[J]. 光谱学与光谱分析, 2012, 32(4): 1127. KOU Jie-ting, Bayanheshig, TANG Yu-guo, QI Xiang-dong, YU Hong-zhu. Wavelength Calibration Research on the Automatic Grating Monochromator for Orthogonal Czerny-Turner Structure[J]. Spectroscopy and Spectral Analysis, 2012, 32(4): 1127.

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