C-T型棱镜透射式中阶梯光栅光谱仪谱图还原模型

发布时间：2018-12-25 14:59

【摘要】：中阶梯光栅光谱仪通过交叉色散形成的二维光谱图,无法直接对入射光的波长进行光谱标定。为此,建立了C-T型棱镜透射式中阶梯光栅光谱仪的谱图还原模型,分别分析了棱镜和光栅色散方向的色散规律以及棱镜与光栅之间的相互作用关系,并且建立了波长与像面坐标的关系表达式。根据该类中阶梯光栅光谱仪的光路结构特点,以及光束在各个光学元件的传输特性,校正各光学元件引入的坐标计算误差,最终精确计算出波长所对应的像面坐标,完成谱图还原模型的建立。通过该方法建立的模型可快速准确地对该类型中阶梯光栅光谱仪二维谱图进行谱图还原及波长标定,模型的计算误差小于一个像元。
[Abstract]:The middle step grating spectrometer can not directly calibrate the wavelength of incident light by two dimensional spectrogram formed by cross dispersion. For this reason, the spectral pattern reduction model of the C-T prism transmission medium step grating spectrometer is established. The dispersion law of the prism and the grating dispersion direction and the interaction between the prism and the grating are analyzed, respectively. The expression of the relationship between wavelength and image plane coordinate is established. According to the structure of the optical path of the stepped grating spectrometer and the transmission characteristics of the beam in each optical element, the coordinate calculation error introduced by each optical element is corrected, and the image plane coordinate corresponding to the wavelength is calculated accurately. The establishment of spectral reduction model is completed. The model established by this method can quickly and accurately restore the two-dimensional spectrum of the stepped grating spectrometer and calibrate the wavelength. The calculation error of the model is less than one pixel.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家973计划(2014CB049500) 国家自然科学基金(61505204) 国家重大科学仪器设备开发专项(2014YQ120351) 国家重大科研装备研制项目(ZDYZ2008-1) 吉林省科技发展计划项目(20140203011GX;20140204075GX)
【分类号】：TH744.1

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