基于线阵探测器的单圈绝对轴角编码器

为了解决轴角编码器尺寸与角度分辨率之间的矛盾,同时提高编码器的响应频率,提出了一种基于线阵探测器的单圈绝对式光电轴角编码器.该编码器使用了一种新型单圈绝对式编码盘,整个码盘只有一个码道,粗码被直接刻在这个单圈的码道上,码盘图像经光学放大后被线阵探测器接收.利用FPGA控制电路将数据传送至计算机,并对数据进行译码处理,分别利用图像处理技术读取粗码和利用像素细分技术获得细码,两者相结合得到角度信息.通过该技术设计一个码盘直径为40 mm的绝对式轴角编码器,其分辨率为15位.

A Single-track Absolute Angular Encoder Using the Linear Detector

In order to solve the contradiction between the disc size and resolution, and to attain the high response speed, a new photoelectric absolute angular encoder is proposed based on a single-track coded disc and a linear detector. A new single-track absolute coded disc is used in the encoder. The encoded units are directly carved on one track. The image of coded disc is magnified by the imaging lens, and received by the linear detector. The FPGA control circuit sends the data of image to the computer for data processing. An integrated 7 bits binary code is obtained by image processing and the subdivision code unit is gained by pixel subdivision technique respectively, which are both contributed to the angular information. An absolute angular encoder, which contains a diameter of 40 millimeter code disc, is designed based on the technique. Its resolution can reach 15 bit.