Optical fiber temperature sensor with insensitive refractive index and strain based on phase demodulation

2020 ◽  
Vol 62 (12) ◽  
pp. 3733-3738
Author(s):  
Tong Nan ◽  
Bo Liu ◽  
Yongfeng Wu ◽  
Junfeng Wang ◽  
Yaya Mao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Temperature Sensor ◽  
Phase Demodulation

Refractive index and temperature sensor based on optical fiber Mach–Zehnder interferometer with trapezoid cone

2019 ◽  
Vol 58 (05) ◽  
pp. 1 ◽  
Author(s):  
Wenlin Gao ◽  
Weihua Zhang ◽  
Zhengrong Tong ◽  
Yimei Zhong ◽  
Juan Qin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Temperature Sensor ◽  
Zehnder Interferometer ◽  
Mach Zehnder Interferometer

scholarly journals Optical Fiber FP Sensor for Simultaneous Measurement of Refractive Index and Temperature Based on the Empirical Mode Decomposition Algorithm

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 664 ◽  
Author(s):  
Everardo Vargas-Rodriguez ◽  
Ana Dinora Guzman-Chavez ◽  
Roberto Baeza-Serrato ◽  
Mario Alberto Garcia-Ramirez
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Empirical Mode Decomposition ◽  
Temperature Sensor ◽  
Dynamic Measurement ◽  
Intrinsic Mode Functions ◽  
Interferometric Sensors ◽  
Mode Decomposition ◽  
The Mathematical Model ◽  
Proof Of Principle

In this work, a dual refractive index and temperature sensor based on an interferometric system and on the empirical mode decomposition (EMD) algorithm is presented. Here, it is shown that the EMD provides a comprehensive way to analyze and decompose complex reflection spectra produced by an interferometric filter build at the tip of an optical fiber. By applying the EMD algorithm, the spectrum can be decomposed into a set of intrinsic mode functions (IMF) from which the temperature and the refractive index can be easily extracted. Moreover, the proposed methodology provides a detailed insight of the behavior of this type of interferometric sensors and allows widening of the dynamic measurement ranges of both variables. Here, for proof of principle purposes, a filter based on a stack of three layers (two of them were thermo-sensitive) was fabricated. Finally, it is shown that the proposed methodology can decompose the experimental measured spectra and to determine the refractive index and the temperature, supporting the mathematical model.

scholarly journals Monitoring of Moisture in Transformer Oil Using Optical Fiber as Sensor

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
S. Laskar ◽  
S. Bordoloi
Keyword(s):  
Refractive Index ◽  
Moisture Content ◽  
Optical Fiber ◽  
Diode Laser ◽  
Temperature Sensor ◽  
Optical Fiber Sensor ◽  
Transformer Oil ◽  
Fiber Sensor ◽  
Laser Source ◽  
Sensor Probe

This paper describes an optical fiber sensor and temperature sensor-based instrumentation system to measure the moisture content in transformer oil. The sensor system consists of (i) Diode Laser Source, (ii) a bare and bent multimode fiber as sensor probe, (iii) an LDR as detector, (iv) LM35-based temperature sensor, and (v) microcontroller system having a trained ANN for processing and calibration. The bare and bent optical fiber sensor and the temperature sensor LM35 are used to provide the measures of refractive index (RI) and temperature of a transformer oil sample. An ATmega32-microcontroller-based system with trained ANN algorithm has been developed to determine the moisture content of the transformer oil sample by sampling the readings of the bare bent optical fiber sensor and the temperature sensor.

Graphene oxide filled optical fiber micro-cavity based temperature sensor

2019 ◽  
Author(s):  
Nelia Alberto ◽  
M. Fatima Domingues ◽  
Gil Goncalves ◽  
Paulo Antunes ◽  
Paula Marques ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Temperature Sensor ◽  
Micro Cavity

scholarly journals Refractive Index Sensor for Salty and Sugary Solution Based on Optical Fiber Technical

2021 ◽  
Vol 1879 (3) ◽  
pp. 032077
Author(s):  
Maher Khaleel Ibrahim ◽  
Shehab A Kadhim ◽  
Nabeil Ibrahim Fawaz
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Refractive Index Sensor
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