To compensate of the nonlinearity error of heterodyne interferometers in nanometer measurement, a method for reducing the first harmonic nonlinearity is proposed.
为了补偿激光外差干涉纳米测量中的非线性误差，提出了一种减小非线性误差的一次谐波方法。
Based on the measurement of the contact Angle of differently treated ITO, the surface energy and polarity were calculated using the harmonic mean method.
在测量ito接触角的基础上，应用调和平均法计算了不同表面处理ITO阳极的表面能和极性度。
Harmonic measure method is the key of the measurement. In this paper, the harmonic measure method which based on the multiple frequency rotate transform theory is researched and analyzed.
谐波测量方法是谐波测量的核心环节，本文对基于倍频旋转变换理论的谐波测量方法进行了研究分析。
Harmonic detection is the important part of harmonic issue and harmonic detection method is the key of harmonic measurement. This paper primarily studies the harmonic detection methods.
谐波测量方法是谐波测量的核心环节，本文对谐波测量方法进行了研究分析。
The errors of harmonic wave analysis and direct sampling in electric parameters measurement are analyzed. The method to minimize errors is presented.
分析了电力参数微机监测中的直接采样计算法与谐波分析法的误差，并提出了减小误差的方法。
The results of computer simulation and the application on the electrical power measurement instrument have shown that the method improves the accuracy of the harmonic analysis.
计算机仿真及实际的配电综合测控仪中的应用表明该方法能有效提高测量谐波的准确度。
After studying on the measurement principle of power system harmonic based on FFT theory, this paper presents a high-accuracy method based on phase difference correcting to measure the harmonic.
研究了基于FFT理论的电力谐波检测原理，提出一种基于相位差校正法的高精度电力谐波检测方法。
After studying on the measurement principle of power system harmonic based on FFT theory, this paper presents a high-accuracy method based on phase difference correcting to measure the harmonic.
研究了基于FFT理论的电力谐波检测原理，提出一种基于相位差校正法的高精度电力谐波检测方法。
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