Ultra miniature absolute optical encoder based on eight-matrix coding

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Ultra miniature absolute optical encoder based on eight-matrix coding

Article | 更新时间：2020-08-12

- Ultra miniature absolute optical encoder based on eight-matrix coding
- Optics and Precision Engineering Vol. 18, Issue 2, Pages: 326-333(2010)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：08 December 2008，
  
  Revised：12 February 2009，
  
  Published Online：20 February 2010，
  
  Published：20 February 2010
- 稿件说明：
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刘长顺,王显军,韩旭东,盖竹秋,王增发. 八矩阵超小型绝对式光电编码器[J]. 光学精密工程, 2010,18(2):326-333

Ultra miniature absolute optical encoder based on eight-matrix coding[J]. Optics and precision engineering, 2010, 18(2): 326-333.
刘长顺,王显军,韩旭东,盖竹秋,王增发. 八矩阵超小型绝对式光电编码器[J]. 光学精密工程, 2010,18(2):326-333 DOI：

Ultra miniature absolute optical encoder based on eight-matrix coding[J]. Optics and precision engineering, 2010, 18(2): 326-333. DOI：

摘要

为了实现高精度、高可靠性绝对式光电编码器的小型化，对编码器的编码方式和读数头的结构等进行了研究。绝对式光电编码器小型化所采用的八象限矩阵码（八矩阵），区别于传统四象限矩阵码，它是通过两圈编码就可以实现10位自然二进制编码，优化了编码方法，缩小了绝对编码的结构尺寸，减小了原来因编码圈数多，而彼此之间的转换产生的位置误差。运用错位法获得圆光栅莫尔条纹，采用单头读数，减少发光元器件(光源)数量。实验结果表明，实现了Φ25mm×16mm的超小体积，分辨率经过电子细分可达16位，精度（1σ）达到30″。极高的可靠性可保证在极其苛刻条件下长期正常工作，在航空航天和军事等领域有广泛的应用前景。

Abstract

In order to realize miniaturization of absolute optical encoder with the character of greater accuracy and more reliability

a new coding mode and structure of reading head are investigated. The eight-matrix coding used in absolute optical encoder

is different from custom four-matrix coding. Eight-matrix coding which reduce dimension of encoder greatly is a bran-new coding technique. It can realize the function of 10-bit binary coding through only two grating tracks. With the optimizing coding

we reduce the position errors which are brought by signals getting from two grating tracks. The grating tracks are more the position error is bigger. Single reading-head is also good for reducing dimension of encoder

so the number of LED is smaller. Moiré fringe obtained by phase compensation is another new technique in this paper. Experimental results indicate that eight-matrix encoder has smaller size (Φ25mm×16mm)

lighter weight while higher resolution (resolution of 16-bit)and higher accuracy(30″). Also it can normally work in very hard condition for long time with more reliability. It can be widely applied to the field of modern military and aerospace.

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Related Institution

吉林大学电子科学与工程学院集成光电子学国家重点联合实验室

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安徽大学电子科学与技术学院

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