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针对莫尔条纹信号质量对高精度编码器细分误差的影响,提出了基于离散傅里叶变换分析莫尔条纹信号质量的方法。该方法利用信号重构和傅里叶变换算法得到信号参数,真实地反应了莫尔条纹信号质量,提高了细分误差测量的准确性。编码器转动时,采集相位差为π/2的两路精码正弦光电信号,通过对采样信号的重构得到信号波形,利用离散傅里叶变换算法分析重构波形,求解信号的直流分量、幅值、相位和谐波分量等各项参数。最后,根据信号参数与细分误差的关系得到光电编码器的细分误差值,并进行了实验验证。实验结果表明,对某24位绝对式光电轴角编码器细分误差进行测量,细分误差的峰值为+0.48“和-0.21”。相对于传统的细分误差测量方法,此方法测量速度快,测量精度高,适用于工作现场。
Aiming at the effect of moire fringe signal quality on high-precision encoder subdivision error, a method based on discrete Fourier transform for moire fringe signal quality is proposed. The method uses signal reconstruction and Fourier transform algorithm to obtain the signal parameters, which realistically reflects the moire fringe signal quality and improves the accuracy of the subdivision error measurement. When the encoder is rotated, two precise sinusoidal photoelectric signals with phase difference of π / 2 are collected, and the signal waveform is obtained by reconstructing the sampled signal. The discrete Fourier transform algorithm is used to analyze the reconstructed waveform to solve the DC component of the signal, Amplitude, phase and harmonic components and other parameters. Finally, according to the relationship between the signal parameters and the subdivision error, the subdivision error value of the photoelectric encoder is obtained and verified by experiments. The experimental results show that the subdivision error of a 24-bit absolute photoelectric optical encoder is +0.48 “and -0.21 ”. Compared with the traditional method of subdivision error measurement, this method has the advantages of fast measuring speed, high measuring accuracy and suitable for working site.