摘要
本文提出了一种新的莫尔条纹数字化细分技术 ,即采用新的数字信号处理方法 ,利用 CPU的信号处理能力 ,将读数头输出的两路正弦信号经过硬件辩向电路形成每四分之一周期的正反转中断信号 ,并在中断服务程序中进行角度的加减运算 ,实现莫尔条纹的四细分。同时对这两路信号进行新的构建 ,通过 CPU及 A/ D转换器 ,采用软件编程的方法形成一三角波线性函数 ,并采用新颖的细分算法进行二十细分 ,最终实现莫尔条纹的八十细分 ,角度测量的分辨力可达
A novel digital subdividing technique for Moiré fringes is put forward in this paper. The digital signal processing method and its software implementation is carried out in a single chip microprocessor. First, the two digitized sine signals from the two measuring channels are processed by the seuse finding circuit to generate a interrupt pulse signal whose frequency is four times as that of the sine signal. Then in the interrupt service routine, the measured angles are calculated to implement four folds Moiré fringes subdivision. At the same time, with the aid of CPU and A/D convertor, a triangular wave signal is calculated based on the two sine signals. Then a novel subdividing technique is utilized to realize twenty folds subdivision. Finally, eighty folds subdivision is applied to the Moiré fringes, and the angular measuring precision is up to 1″.
出处
《光学技术》
EI
CAS
CSCD
2000年第4期294-296,共3页
Optical Technique
关键词
光栅
莫尔条纹
单片机
细分
辩向
optical grating
Moiré fringes
single chip microprocessor
subdivision
seuse finding
