一种新型高精度绝对式光电编码器研制

Research and Development of a New High Accuracy Absolute Photoelectric Encoder

摘要: 介绍了多读数头消除角位移误差的原理。提出一种新的多读数头全量程数字量相加的处理方法，所构建的编码器，省去了传统的高精度绝对式光电编码器中设置的粗读数头，无精–粗校正范围的严格要求，提高了可靠性。使用游标编码，仅用三条码道构成了完整的绝对式代码系统，大大降低了编码器的径向尺寸。利用空间滤波技术，提高了光电信号的波形质量，实现了高插补系数细分。采用空间滤波、游标编码和多读数头全量程数字量相加所构建的绝对式光电编码器取得了高精度、高可靠性和小型化效果。给出了三种23位绝对式光电编码器的精度测试结果。已形成产品，并在相关领域获得较为广泛的应用。

Abstract: The principle of the eliminating angulate position deviation was introduced. A new handling method of adding digital quantities of multi-head reading in the total measurement range was proposed to construct a new absolute photoelectric encoder, coarse reading head of the conven-tional encoder was left out and the harsh requirements for “fine-coarse” correction range were moved and the encoders reliability had been improved. A complete absolute code system of the encoder with three nonius code tracks was constituted and the radial dimension of the encodes was dramatically decreased. The spatial filtering technology was used to improve the photoelectricity signal waveform quality and the high interpolation factor subdivision was realized. The spatial filtering, the nonius encoding and the adding digital quantities of multi-head reading in total measurement range were used to construct a new absolute photoelectric encoder, which had the advantages of high accuracy, high reliability and miniaturization. The testing accuracy of three kinds of 23 bit absolute photoelectronic encoders was given. The products have already been extensively used in relevant fields.