Combined Bending and Torsion Sensing by Induced Birefringence in Distributed Bragg Reflector Laser

Measurement of torque or twist angle and mechanical bending is important in several fields such as structural health monitoring, movement analysis, robotics instrumentation, and mechanical systems in general. Several optical fiber sensors have been already proposed to measure these parameters separa...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-02, Vol.37 (3), p.861-867
Main Authors: Diaz, Camilo A. R., Leal-Junior, Arnaldo Gomes, Marques, Carlos, Leitao, Catia, Andre, Paulo S. de Brito, Antunes, Paulo F. C., Pontes, Maria Jose, Frizera-Neto, Anselmo, Ribeiro, Moises R. N.
Format: Article
Language:English
Subjects:
Bend
Birefringence
Cavity resonators
DBR lasers
distributed Bragg reflector
Distributed Bragg reflectors
erbium doped fiber
fiber Bragg grating
Interrogation
Mechanical systems
Optical device fabrication
Optical fibers
Optical mixing
Optical polarization
Optical sensors
Questioning
Robotics
Sensitivity analysis
Sensitivity enhancement
Structural health monitoring
twist
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Summary:Measurement of torque or twist angle and mechanical bending is important in several fields such as structural health monitoring, movement analysis, robotics instrumentation, and mechanical systems in general. Several optical fiber sensors have been already proposed to measure these parameters separately. However, their high-cost interrogation systems are the main drawback for their large commercial application. Distributed Bragg reflector (DBR) allows to overcome this issue since its inherent heterodyne behavior leads to interrogation schemes in the frequency domain instead optical domain reducing significantly the interrogation systems cost. In this context, this paper presents a DBR to measure twist angle up to 180°. The enhancement of twist sensitivity by bending-induced birefringence is analytically and experimentally demonstrated achieving a value of -2.95 MHz/rad. With a constant bending angle of 20°, a twist sensitivity of -32.73 MHz/rad is achieved, which represents a enhancing sensitivity by a factor of \sim7, when compared to some DBR sensor configurations reported in the literature.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2882137