CAJ | 학술논문

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。
침대막이조문신호질량대고정도편마기세분오차적영향，제출료기우리산부리협변환분석막이조문신호질량적방법。해방법이용신호중구화부리협변환산법득도신호삼수，진실지반응료막이조문신호질량，제고료세분오차측량적준학성。편마기전동시，채집상위차위π/2적량로정마정현광전신호，통과대채양신호적중구득도신호파형，이용리산부리협변환산법분석중구파형，구해신호적직류분량、폭치、상위화해파분량등각항삼수。최후，근거신호삼수여세분오차적관계득도광전편마기적세분오차치，병진행료실험험증。실험결과표명，대모24위절대식광전축각편마기세분오차진행측량，세분오차적봉치위+0.48"화-0.21"。상대우전통적세분오차측량방법，차방법측량속도쾌，측량정도고，괄용우공작현장。
Aiming at the affection of Morié fringe signal quality for high- precision encoder interpolation error,a method of analysis based on quality of morié fringe signals for high precision optical encoder was presented. The signal parameters were obtained with using signal reconstruction and Fourier transform algorithm, which reflects the real Morié signal quality. The accuracy of interpolation error of measurement was improved. While the encoder is motion, the data acquisition card samplings two photoelectric signal with a phase difference of π/2. The signal waveform was got by reconstruction algorithm of sampling the signal. Through the discrete Fourier transform algorithm analyzing reconstruction waveform, the parameters like DC component, amplitude, phase, and harmonic component were solved. Finally, dynamic interpolation error is obtained based on relationship between the signal parameters and interpolation error by experimental verification. Experimental results show that, the interpolation error of a 24- bit absolute rotary optical encoder was measured . Interpolation extreme errors are+0.48" and - 0.21". Compared with traditional method of interpolation error measurement, this method measures quickly . It is applicable to real- time detection of encoder dynamic interpolation error at the actual work site .