单色仪与成像光谱仪的交互光谱定标

Cross-spectral calibration for monochromator and imaging spectrometer

为了提高成像光谱仪的光谱定标精度,降低定标过程的复杂度,本文基于单色仪扫描定标法的原理,提出了交互光谱定标的思想,设计了适用于单色仪与成像光谱仪的交互光谱定标系统.分别对单色仪与成像光谱仪进行了光谱定标实验,并对定标数据进行了处理分析.结果显示：单色仪光谱定标精度优于±0.1 nm;成像光谱仪的光谱区大于400～800 nm,光谱分辨率优于3 nm.该交互光谱定标系统避免了对单色仪和成像光谱仪分别定标需要两个探测器的弊端,定标过程中只需切换定标模式,简化了定标过程,能够同时保证单色仪与成像光谱仪的定标精度,具有复杂度低、通用性强、适用范围广及较高的定标精度等优点,可满足实际使用要求.

To improve the spectral calibration accuracy of an imaging spectrometer and to reduce the complicity of the calibration process, the idea of the cross-spectral calibration was proposed based on the calibration principle of monochromator scanning. Then, a cross-spectral calibration system was designed for a monochromator and an imaging spectrometer. The spectral calibration experiments for the monochromator and the imaging spectrometer were performed and the spectral calibration data were processed. The experimental results show that the accuracy of the spectral calibration for the monochromator is better than ±0. 1 nm , the spectral range of the imaging spectrometer is greater than 400--800 nm and its spectral resolution is better than 3 nm. The cross-spectral calibration sys- tem overcomes the defect that the spectral calibration for the monochromator and the imaging spec-trometer requires two detectors, and the calibration is implemented by switching the calibration modes only. It offers higher calibration accuracy for both the monochromator and the imaging spectrometer, and has the merits of low complexity, versatility, wider range and high calibration accuracy.