Fringe counting scheme with two directions and dual threshhold for Mach-Zehnder interferometer

CUI Hong-liang; LANG Jin-peng; CHANG Tian-ying; CHEN Jian-dong; YU Miao

doi:10.3788/OPE.20162413.0197

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Fringe counting scheme with two directions and dual threshhold for Mach-Zehnder interferometer

更新时间：2020-08-13

- Fringe counting scheme with two directions and dual threshhold for Mach-Zehnder interferometer
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 197-202(2016)
- 作者机构：
  
  吉林大学仪器科学与电气工程学院,吉林长春,130026
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0197
  CLC： TN253;TN763
- Received：04 June 2016，
  
  Revised：21 June 2016，
  
  Published：14 November 2016
- 稿件说明：
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崔洪亮, 郎金鹏, 常天英等. 用于Mach-Zehnder干涉仪的双向双阈值条纹计数方案[J]. 光学精密工程, 2016,24(10s): 197-202

CUI Hong-liang, LANG Jin-peng, CHANG Tian-ying etc. Fringe counting scheme with two directions and dual threshhold for Mach-Zehnder interferometer[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 197-202
崔洪亮, 郎金鹏, 常天英等. 用于Mach-Zehnder干涉仪的双向双阈值条纹计数方案[J]. 光学精密工程, 2016,24(10s): 197-202 DOI： 10.3788/OPE.20162413.0197.

CUI Hong-liang, LANG Jin-peng, CHANG Tian-ying etc. Fringe counting scheme with two directions and dual threshhold for Mach-Zehnder interferometer[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 197-202 DOI： 10.3788/OPE.20162413.0197.

摘要

为了精确测量干涉信号中相位改变量，建立了基于马赫增德尔干涉的光路结构，提出了一种高精度的条纹计数解调方案。首先，对马赫增德尔干涉的结构进行了介绍，对基于33耦合器的马赫增德尔干涉结构的输出信号进行了分析，并利用输出干涉信号与输入光强信号的关系，提出了抗光源扰动影响的数据处理方案。接着分析了传统的条纹计数解调方案，提出了一种高精度的解调方法，该方法将传统的过零检测法与阈值判别法结合，并将传统的单向判向计数更改为双向判向计数。最后，搭建了一种MZ干涉系统，并以光纤拉伸实验对改进的解调方案进行验证。实验和分析表明，改进的条纹计数解调方案相比于传统的条纹计数方案判向次数提高4倍，可以实现/4相位改变量的测量，相位解调精度为传统计数方案的4倍得到了明显的提高。

Abstract

To realize accurate measurement of phase shift of interference signals

an optical path structure based on Mach-Zehnder Interferometer was established. A fringe counting demodulation scheme with high accuracy was put forward. Firstly the structure of Mach-Zehnder Interferometer was introduced

and a data processing scheme for resisting light source interference was proposed base on the relationship between the input light intensity signal and output interference signal

which was from Mach-Zehnder Interferometer with 33 fiber coupler. Then due to the deficiency of conventional fringe counting demodulation

an improved demodulation with high accuracy was proposed by combining zero-cross detection with threshold method. This method changes the unidirectional counting single into bidirectional counting single. Finally

an interference system based on Mach-Zehnder Interferometer was established for the verification of the improved demodulation scheme through optical tensile experiment. The experiment result shows the direction judgment times of the improved demodulation scheme is 4 times as many as that of conventional scheme

and /4 phase change quantity can be realized. The demodulation accuracy of the improved demodulation scheme increases dramatically

for the total phase demodulation accuracy is improved to 4 times of the traditional count scheme.

关键词

Keywords

references

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