主题：什么是波长调制技术

1.光电倍增管接受光源信号的同时，也接收日光信号，也检测到火焰中分子发射信号。为了区分它们的差别，对空心阴极灯采用波长调制技术。
2.使用高频方波脉冲供电。
对否，请指教！

这是我看到的资料

波长调制由W.SNELLEMAN提出,并用波长调制技术解决了AAS分析中连续光源的不稳定和宽带背景吸收两大问题,在这个问题上波长调制技术是对某一波长的光谱线信号在+_&波长范围往返扫描并获得光谱线的轮廓.

这个文献上有介绍,谁能查到原文

An a.c. scanning method with increased sensitivity in atomic absorption analysis using a continuum primary source

W. Snelleman

Physics Laboratory, University of Utrecht, The Netherlands

Received 17 August 1967.  Available online 17 January 2002.




Abstract
An expression for detection limits in atomic absorption spectrometry, using a continuum primary source, is deduced from fluctuation principles. An experimental set-up which employs a high-pressure xenon lamp and a.c. scanning of a spectral line is described, which greatly reduces the effect of instabilities in the primary source. The measurements with this set-up on Cu (3247 Å) are in agreement with the calculations. An absorption of 0.03 % is measured, equivalent to a concentration of 4 × 109 atoms per cm3 in the flame.