基于多项式拟合残差法的光纤光谱仪的波长定标方法研究

光纤光谱仪在各个领域都有着重要的应用,它采用光纤作为信号耦合器件,体积小,信号传输效果好,可以灵活搭建光谱采集系统。评价一台光谱仪的性能有许多重要指标,但受气压、温度、使用环境、使用年限等外部因素的影响,光纤光谱仪中重要部件的参数会发生偏移,例如光纤的发散角、光栅的衍射能力和探测器的探测效率等,所以,定期对光纤光谱仪进行波长校正是非常有必要的。通过利用HG-1汞-氩校准光源,应用多项式拟合残差法对E820光纤光谱仪进行波长定标实验,并将定标前后的光谱数据进行对比,研究了波长定标方程对波长准确度的影响,最后说明了波长定标在分析光谱仪性能中的重要作用。

Wavelength Calibration of the Fiber Optic Spectrometer Based on the Polynomial Fitting Residual Error Method

Fiber optic spectrometer has important application in each domain, it uses fiber as signal coupling compo-nent, and it has small size, good signal transmission effect, also can build a flexible spectral acquisition system. To evaluate the performance of a spectrometer has many important index, because of the pressure, temperature, environ-ment,fixed number of year and the impact of external factors etc.,the parameters of the important components in opti-cal fiber spectrometer will occur, such as the divergence angle of the fiber and grating diffraction capability and the probe detection efficiency,etc.,so making a regular wavelength calibration in the fiber optic spectrometer is very neces-sary,this paper mainly talking about using HG-1 mercury-argon calibration sources for wavelength calibration,and ap-plying the polynomial fitting method into this measurement in order to test E820 fiber optic spectrometer. We also stud-ied influence of wavelength calibration equation on wavelength accuracy. At the last, we talk about the importance of wavelength calibration in the evaluation of fiber optic spectrometer.