CN85106313A - 一种光栅莫尔条纹光电讯号的细分方法 - Google Patents

一种光栅莫尔条纹光电讯号的细分方法 Download PDF

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CN85106313A
CN85106313A CN 85106313 CN85106313A CN85106313A CN 85106313 A CN85106313 A CN 85106313A CN 85106313 CN85106313 CN 85106313 CN 85106313 A CN85106313 A CN 85106313A CN 85106313 A CN85106313 A CN 85106313A
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signal
divided method
moire fringe
potential drop
dividing potential
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邓树森
边强
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Institute of High Energy Physics of CAS
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Abstract

一种适于光栅莫尔条纹光电讯号的细分方法,它是将两路原始光电讯号分别进行全波整流。并将其中一路全波整流后的讯号按正余切规律分压,再去与另一路整流后的讯号比较。从而直接得出细分后的一串矩形波,经逻辑变换,变成相差90°的两路周期码,经取沿判向便可送入可逆计数器得到细分后的代码。本发明与现有细分方法比较,有体积小、细分精度高、成本低,可靠性高等优点。

Description

本发明属于光栅数字读数用电子学细分新方法。
光栅莫尔条纹技术已广泛应用于机床数控,各种数字式长度、角度测量仪器,计算机外部设备,雷达、火炮系统、跟踪经纬仪、天文望远镜等多种科学研究和军事设施上。
在应用光栅莫尔条纹技术进行角度和长度测量时,因为不可能把光栅刻线周期刻得过细,所以多采用将莫尔条纹光电讯号进行电子学细分来得到高分辨率、高精度测量结果。
通常使用的电子学细分方法有电阻链法和三角波幅值切割法。前者的缺点是电子线路体积大,结构复杂,精度较低,成本高。
针对目前采用的细分方法的缺点,本发明提供了一种新的细分方法。其主要原理是将原始讯号进行全波整流,处理成为U2=|UsinQ|2U2=|UcosQ|,然后用U2
Figure 85106313_IMG1
λQ1U2,λQ2U2……λQRU2(R为光电讯号八分之一周期内的细分数)与U1在电压比较器中进行比较,即把U2按一定规律分压,后再在U1近似线性区(nπ- (π)/4 ≤Q≤nπ+ (π)/4 )n为0,±1,±2,±3……)去比较,在比较点上可得到对应的相位的矩形波,同理,用U1,λQ1U1,λQ2U1……λQkU1与U2在区间(nπ+ (π)/4 ≤Q≤nπ+ (3π)/4 )进行比较,经比较后又可得一组矩形波。由上述的两组矩形波可得如图的阶梯码,再把它进行逻辑变换,变成相移90°的周期码X,y,经取沿、判向、计数便可得出细分后的代码。
由本发明所提供的细分方法而制作出的电路,与现有细分方法相比,可得到体积更小,细分精度高,成本大大降低,可靠性高等优点。
图中1表示前置放大器
2表示分压电阻
3表示固体电路

Claims (4)

1、一种适合光栅莫尔条纹光电讯号的细分方法。其特征在于它使用两路原始讯号的绝对值U1=┃USinQ┃及U2=┃UcosQ┃直接分压并相互比较,产生一组矩形波。
2、按权项1所述的方法,其特征在于U1、U2的分压规律为λQR=|ctgQ|。对应区间为(nπ- (π)/4 ≤Q≤nπ+ (π)/4 )及λQR=|tgQ|,对应区间为(nπ+ (π)/4 ≤Q≤nπ+ 3/4 π),并按上述规律得出分压值。
3、按权项1、2所述方法的电路,其特在于Ic1及Ic2组成的全波整流电路。
4、按权项3所述电路,其特征在于各比较器的输入讯号一路为U=|Usin|或U=|Ucos|,另一路为U=λQ|Ucos|或U=λQ|Usin|。
CN 85106313 1985-08-21 1985-08-21 一种光栅莫尔条纹光电讯号的细分方法 Pending CN85106313A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103604373A (zh) * 2013-11-20 2014-02-26 沈阳工业大学 光栅莫尔条纹小波细分方法及光栅位移测量装置
CN107255448A (zh) * 2017-06-01 2017-10-17 常州秦宁迈超电子科技有限公司 光栅莫尔条纹细分方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103604373A (zh) * 2013-11-20 2014-02-26 沈阳工业大学 光栅莫尔条纹小波细分方法及光栅位移测量装置
CN103604373B (zh) * 2013-11-20 2016-04-20 沈阳工业大学 光栅莫尔条纹小波细分方法及光栅位移测量装置
CN107255448A (zh) * 2017-06-01 2017-10-17 常州秦宁迈超电子科技有限公司 光栅莫尔条纹细分方法
CN107255448B (zh) * 2017-06-01 2019-09-27 常州秦宁迈超电子科技有限公司 光栅莫尔条纹细分方法

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