Working-point control method for readout of dynamic phase changes in interferometric fiber-optic sensors by tuning the laser frequency

被引：7

作者：

Wang, Zefeng ^{[1
]}

Hu, Yongming ^{[1
]}

Meng, Zhou ^{[1
]}

Ni, Ming ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China

来源：

APPLIED OPTICS | 2008年 / 47卷 / 19期

关键词：

D O I：

10.1364/AO.47.003524

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A simple but reliable method, namely the working-point control by tuning the laser frequency, for the dynamic phase shift measurement in a passive homodyne interferometric fiber-optic sensor is proposed. A dc voltage calculated from the photodetector output is applied to the light source to control the interferometer at the condition of maximum sensitivity. Then the signal's phase shift can be obtained from the components of zero and fundamental frequencies. To test the method, an all polarization-maintaining Mach-Zehnder interferometer with a piezoelectric ceramic (PbZrTiO3, or PZT) cylinder in one arm is constructed. The experimental results show that the simulation signal's phase shift generated by the PZT cylinder can be read out correctly with the method. It has the advantages of simplicities of operation, no-active element in the sensing head, and large operating bandwidth. It can be used for readout of dynamic phase shifts in various interferometric fiber-optic sensors. (c) 2008 Optical Society of America.

引用

页码：3524 / 3529

页数：6

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