Precision measurement method of full-cycle torsion angle based on Moiré fringe
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
维普
万方数据
由于将莫尔条纹图进行快速傅里叶变换时会导致频谱泄露,导致无法实现 360°的全周精确测量,因此提出基于莫尔条纹的全周转角测量方法并搭建转角测量系统.以 1°为步距,利用CMOS相机采集不同宽度的莫尔条纹图像,采用快速傅里叶变换(fast Fourier transform,FFT)对条纹进行处理,得到光栅频谱信息.同时采用汉宁窗能量重心校正算法(Hanning-window energy centrobaric method,HnWECM)校正频谱,得到莫尔条纹图像表征转角的真实有效信息,实现全周精确测量.实验结果表明,该系统可快速精准地实现转角的全周测量,测量范围广,最大误差率为0.2433%.
Due to the leakage of frequency spectrum caused by applying fast Fourier transform to the Moiré fringe image,it becomes challenging to achieve accurate 360° full-cycle measurements.A measurement method of full-cycle torsion angle based on Moiré fringe was proposed and a set of torsion angle measurement system was built.The Moiré fringe images with different widths were acquired by a CMOS camera at 1° intervals,and then the grating frequency spectrum information could be obtained by adopting fast Fourier transform(FFT).In addition,the frequency spectrum was corrected by the Hanning-window energy centrobaric method(HnWECM),and the real and effective information of torsion angle represented by Moiré fringe image could be obtained to achieve precision measurement of full-cycle torsion angle.Experimental results show that the system can quickly and accurately realize the full-cycle measurement of the torsion angle with the advantage of wide measurement range,and its maximum error rate is 0.2433%.
torsion angle measurementMoiré fringefast Fourier transformHanning-window energy centrobaric method
维普
万方数据
