探测器光谱响应对光谱仪器波长标定中谱峰位置的影响  

The influence of detector spectral response on the peak position determination in the spectrometer wavelength calibration process

作　　者：黄星月[1] 杨怀栋[1] 何庆声[1] 田禾[2] 金国藩[1] 

机构地区：[1]清华大学精密测试技术与仪器国家重点实验室,北京100084 [2]北京普析通用仪器有限责任公司,北京100081

出　　处：《光学技术》2009年第3期323-325,共3页Optical Technique

基　　金：国家自然科学基金(60378016);国家自然科学基金(60578002);教育部科学技术研究重点项目(106014)

摘　　要：一般光电探测器的光谱响应是随波长变化的,这在光谱仪器进行波长标定的过程中,可能会改变标定谱线峰值所在的位置,从而影响标定结果的准确度。为此,针对采用阵列探测器的光谱仪器,建立了以高斯线型为标定谱线轮廓的模型,分析了谱线在探测器上经光谱响应调制及积分抽样后峰值位置发生移动的情况,给出了保证在峰值位置不偏移的情况下探测器光谱响应需满足的条件,特别给出了当仪器分光元件为光栅时,在该条件下结合仪器参数的表达式。为保证光谱仪器波长标定的准确度,在仪器设计阶段,可应用此条件选择适宜的探测器;在仪器应用阶段,亦可根据实际探测器参数,应用此条件选择适宜用于标定过程的谱线。The spectral response of a photoelectric detector varies with the light wavelength. This could change the spectral line shape and cause an offset when determining the peak position in the spectrometer wavelength calibration process. Considering the spectrometer with an array detector, a Gaussian-shaped calibration spectral line＇s integral sampling model is set up. The condition on which the peak position changes upon the impact of the detector spectral response is studied. And the limitation for the detector spectral response not to shift the peak position to another pixel is given. The limitation＇s mathematical expression for a spectrometer with a grating is deduced. To guarantee adequate wavelength calibration accuracy, in spectrometer design, this limitation could be applied to choose a proper detector. In spectrometer calibration, it could he used to choose suitable spectral lines for wavelength calibration.

关 键 词：光谱仪器 阵列探测器 光谱响应 波长标定 

分 类 号：O433[机械工程—光学工程]