Fiber-optic displacement sensor based on the DBR fiber laser

Guoyu Li,Mingsheng Liu,Kang Yang,Yan Li

doi:10.1007/s13320-013-0118-3

Guoyu Li, Mingsheng Liu + Show 2 more

Open Access

https://doi.org/10.1007/s13320-013-0118-3

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Journal: Photonic Sensors	Publication Date: Sep 17, 2013
Citations: 9	License type: CC BY 2.0

Affiliation: Handan College

Abstract

The fiber-optic displacement sensor based on the distributed Bragg reflector fiber laser is proposed, that is, the fiber laser cavity is attached to the measured object, when the measured object is stretched or contracted, and the length of the fiber laser cavity is also stretched or contracted accordingly. In view of the nonlinearity of the fiber-optic displacement sensor, the calibration based on piezoelectric ceramics is applied to improve the linearity of the displacement sensor. Experiment results show that the fiber-optic displacement sensor has a linear response with the nominal working distance of 90 μm.

Highlights

The displacement sensors are essential instruments in metrology [1,2,3]
The measured object was stretched from 0 to 90 μm in steps of 10μm, and the central wavelength of the distributed Bragg reflector (DBR) fiber laser was recorded by the optical spectrum analyzer (OSA)
The measured object was contracted from 90 μm to 0 in step s of 1 0μm, and the central wavelength of the fiber laser was recorded by the OSA

Summary

Introduction

The fiber-optic displacement sensors are more attractive because they have many advantages, such as light weight, compact size, good flexibility, electrical isolation, and capability of multiplexing [4]. All kinds of fiber-optic displacement sensors have been reported. The drawbacks of the intensity-based displacement sensors include nonlinear response, low accuracy, poor stability, and short measurement range. In the last two decades, extensive researches have been investigated for high performance DBR fiber laser sensor applications, including the measurement of transverse pressure [5, 6], lateral force [7, 8] and torsion, and high-frequency ultrasound detection [9, 10]. The fiber-optic displacement sensor based on the DBR fiber laser is proposed. The fiber laser cavity is attached to the measured object, which constitutes a fiber-optic displacement sensor. In view of the nonlinear problem of the fiber-optic displacement sensor, the piezoelectric ceramics (PZT) with closed-loop operation is applied to calibrate the fiber-optic displacement sensors, and it shows a good effect

DBR fiber laser fabrication

Experimental setup

Experimental results