波长调制是通信用语，指利用外界作用改变光纤中光的波长的方法，通过检测光纤中光的波长的变化来测量各种物理量。
Wavelength modulation spectroscopy was performed to increase the signal-to-noise ratio. A sensitivity of 130 ppm was obtained with an integration time of 2 s. The discrepancy between the measured and the calculated value was less than 1%.
在以CO2为样例气体的测量实验中,使用中心发射波长为1578.7nm的VCSEL型二极管激光器获得了CO2的高分辨吸收光谱,通过应用波长调制光谱（WMS）技术显著提高了信噪比,采用2s的积分时间获得了130ppm的测量灵敏度,测量值与计算值的偏差小于1%。
参考来源 - 气体监测的可调谐多模二极管激光关联光谱技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
波长调制光谱(WMS)技术是TDLAS技术中一种重要技术。
Wavelength modulation spectroscopy (WMS) is an important technique of TDLAS.
分析表明波长调制反射谱的实质，是介电函数对能量的一级微商。
It is shown that the wavelength modulated reflective spectrum is essentially the first derivative of dielectric function with respect to the energy.
差分吸收检测和波长调制谐波检测是气体光吸收检测的两种基本方法。
Difference absorption measurement and wavelength modulation harmonic measurement are two fundamental approaches for gas light absorption detection.
应用推荐