提出一种新的二元条码设计方法，可用于绝对式光电位置编码。传统的光电编码器主要基于莫尔光栅条纹技术，把位移量变为电脉冲，结构简单，但由于增量式相对测量方式，从而使得光电编码器的应用受到了限制。本文提出的二元条码设计方法，在单码道上设计了包含三种频率信息的光栅，采用二元脉冲编码调制和误差扩散的方法形成二元条码标尺。在光电位置编码器中，标尺上某一段的条码就成像在线阵CCD 上。对CCD 获取的该段条码信息进行傅里叶变换，滤波和逆傅里叶变换，得到三种频率光栅的相位信息，采用小数重合法得到该段条码的绝对相位分布，从而得到绝对位置信息。新的方法保留了单码道光栅莫尔技术结构简单的优点，同时又能像多码道光栅编码器一样实现绝对位置测量。文中给出了编码方法的详细描述，条码信息处理方法，计算机仿真实验结果，最后给出了绝对式光电位置测量的实验结果。本文提出的方法在绝对式光电位置编码器和数字水准仪等领域具有一定的应用前景。

A new design method for binary barcode was proposed, which was suitable for the photoelectric location coding of absolute style. The traditional photoelectric coder was mainly based on the technology of Moiré fringe grating, the coder was simply structured and could convert the displacement measurement into the electric impulse. However, the application of photoelectric coder was restricted because of the relative measurement style. The new method for the binary code of this dissertation, designed a grating which included three different types of frequency information in the single code channel, and had constructed a new binary barcode by the binary impulse encode modulation and method of the error diffusion. Part of the photoelectric location barcode was imaged on the CCD, and the code information was captured by the CCD simultaneously. By using of the FFT, filter and IFFT, we will found the phase information of the three frequency grating. By using the Excess Fraction Method (EFM), we can get the absolute phase distribution so we can get the information of the absolute position. The new method has preserved the advantage of the simple structure of the single code channel Moiré fringe grating. At the same time, we can let the absolute position measurement come true just like the multi-code channel grating coder. This paper introduces the detailed description of the coding method, the processing method for code information and experimental data of the computer simulation. The new method proposed has a broader application in absolute photoelectric position coder and the digital level.