This paper improved the harmonic current detection method based on UPF (unity power factor), using the slipped window integral to replace the LPF (low pass filter).
本文对基于单位功率因数的谐波电流检测方法进行了改进，用移动窗积分法取代检测中常用的低通滤波器。
Using DFB LD as light source, the detection sensitivity has been greatly improved by light source modulation harmonic measurement.
采用分布反馈式半导体激光器作为光源，通过光源调制实现气体体积分数的谐波检测，显著提高了检测的灵敏度。
An improved adaptive harmonic detection method based on least squares algorithm was presented, its stability is proved by averaging theorem of dynamical system theory.
提出了一种基于最小二乘法的自适应谐波检测方法，并利用动力系统的均值理论证明了该方法的稳定性。
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