An Implementation of Non-contact Optical Fiber Displacement Sensor Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator

被引：0

作者：

Kim, Hyeon-Ho ^{[1
,2
]}

Choi, Sang-Jin ^{[1
,2
]}

Jeon, Keum-Soo ^{[3
]}

Pan, Jae-Kyung ^{[1
,2
]}

机构：

[1] Chonbuk Natl Univ, Dept EE, Jeonju, South Korea

[2] Chonbuk Natl Univ, Smart Grid Res Ctr, Jeonju, South Korea

[3] Wind Valley Co Ltd, Sunchon, South Korea

来源：

FIFTH ASIA-PACIFIC OPTICAL SENSORS CONFERENCE | 2015年 / 9655卷

关键词：

non-contact; displacement sensor; MZ-EOM; FSR;

D O I：

10.1117/12.2184397

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We propose and demonstrate experimentally a non-contact optical fiber displacement sensor based on bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM), which consists mainly of a tunable laser, MZ-EOM, optical collimator, specular object, and photodetector. The relationship between the free spectral range (FSR) and the displacement variation for the proposed scheme is given. The FSR is determined by the dip frequencies with the transfer function of the bidirectional modulation of an MZ-EOM and depends on the travel time. As a result, the FSRs according to the displacement variation are presented via both simulation and experiments. The experimental results for the several displacements using micro-stage and piezo-stack in the frequency range of 100 MHz to 300 MHz show a good agreement with the theoretical analysis. The measured sensitivities for the proposed scheme by using the FSR and the dip frequency shift show 437 kHz/mm and 1203 kHz/mm, respectively.

引用

页数：4

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