精确测定光谱线峰光强新途径的探索  

A new approach of precisely measuring peak intensities of spectral lines

作　　者：刘克玲[1] 黄图江[1] 黄亮 李东刚 

机构地区：[1]中国科学院化工冶金研究所,北京100080

出　　处：《现代科学仪器》1998年第4期23-26,共4页Modern Scientific Instruments

基　　金：科技部光谱仪升级改造经费;中国科学院设备更新专款资助

摘　　要：本文通过探索光谱仪出射光谱线峰位移与温度、波长及系统误差等因素的关系，发现了它们之间的规律性。运用这些规律性，利用传感器及计算机技术，发明了光栅单色仪的智能波长校正装置（IWC），该装置能准确地计算出光栅光谱仪的实时语线峰位移，光栅的驱动装置根据谱线峰位移值修正光栅的旋转，使每条光谱线峰位置准确、顺序地通过先谱仪出射狭缝。智能波长校正装置计算的峰位置与光谱线实时描迹峰位置之差小于0.005nm。将智能波长校正装置应用在扫描式ICP光谱仪上，开发了智能波长校正的扫描式ICP光谱仪，简称扫描式ICP－IWC光谱仪。实验表明，在谱线峰位置上采用定点测量模式，能提高扫描式ICP光谱仪测量谱线峰先强的精密度。扫描式ICP－IWC光谱仪的测量精度约1％，它具有结构简单、无需预热、操作简单、快速、安全可靠等特点。The nonlinear - functional relationships among temperature, wavelength and the Peak wavelength drift are measured,and expressed as two polynomial equations. Based on these equations, an intelligent wavelength - calibrating device (IWC) of a gratingmonochromator was designed. lWC device can calculate the calibrated wavelengihs of analytical lines very quickly. According to the cali-brated values, grating driver would modify the rotation of the grating precisely in order to guarantee that the peaks of the lines pass the ex-it slit of the monochromator accurately and sequentiaIly. The difference hetWeen a calihrated wavelength and a rea1 - time profiled peak isless than 0.005nm. The IWC device is successfully used with a sequential ICP - AES spectrometer,which is ahhreviated as a sequentialICP - IWC spectrometer.The precision of determinations by the sequential ICP - IWC spectrometer is ahout 1% .The experiments of the authors indicate thatthe determining mode of single element at fixed wavelength has the hest precision and accuracy.

关 键 词：光谱仪 波长校正 光谱线 峰光强 ICP光谱仪 

分 类 号：TH744.106[机械工程—光学工程]