Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC

被引：6

作者：

Caldas, Paulo ^{[1
,2
]}

Rego, Gaspar ^{[1
,2
]}

机构：

[1] Inst Politecn Viana Castelo, ProMetheus, Rua Escola Ind & Comercial Nun Alvares, P-4900347 Viana Do Castelo, Portugal

[2] INESC TEC, Ctr Appl Photon, Rua Dr Roberto Frias, P-4200465 Porto, Portugal

来源：

SENSORS | 2021年 / 21卷 / 21期

关键词：

long period grating; optical fiber interferometric sensors; low-coherence interferometric; true pseudo-heterodyne technique; PHOTONIC CRYSTAL FIBER; SINGLE-MODE FIBERS; DEMODULATION; DEVICES; SCHEME; PAIR; COMPENSATION; ORIGIN;

D O I：

10.3390/s21217400

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach-Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.

引用

页数：22

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[1] Application of ELISA in determining the fate of tetracyclines in land-applied livestock wastes [J].