小型光电编码器的高分辨力细分技术

为了实现在不增加体积和重量的前提下提高小型光电编码器分辨力和细分精度，对光电编码器高分辨力细分技术进行了研究。首先，分析了影响小型光电编码器分辨力及细分精度的主要因素；其次，利用ADC841单片机对A/D转换的增益误差和失调误差进行修正；最后，优化电子学细分算法，设计出小型光电编码器高分辨力的信号处理电路。实验结果表明，该设计可以实现编码器精码信号的1 024细分，细分周期误差的峰峰值由163减小到70；将外径为40 mm的小型光电编码器分辨力提高4倍至4.98，精度提高至30。设计的编码器细分方法，电路结构简单、细分数高，可应用于对体积和重量有严格要求的绝对式和增量式光电编码器中。

High resolution interpolation techniques of small photoelectric encoder

In order to improve the resolution and interpolation precision of the small photoelectric encoder without increment of size and weight, some research has been carried out on the high-resolution interpolation method. Firstly, main factors which affected the resolution and interpolation precision of the small photoelectric encoder were analyzed, and then the analog-to-digital conversion gain error and imbalance error were calibrated by microcontroller of ADuC841. Finally, the electronic interpolation algorithm was optimized, and a small photoelectric encoder signal processing circuit with high interpolation precision was designed. Experimental results showed that precise code signal interpolation of 1 024 parts of the encoder could be realized with this design, and peak-to-peak value of the interpolation cycle error could be reduced from 163 to 70. The resolution of the small photoelectric encoder with an exterior diameter of 40 mm could be improved by 4 times up to 4.98, and its precision could be improved to 30. The method improves the resolution and interpolation precision of the encoder.Because of its simple circuit structure and high resolution interpolation the method could be applied to absolute and incremental photoelectric encoders with the limitation of size and weight.