Direct measurement of laser cooling of Yb:YAG crystal at atmospheric pressure using a fiber Bragg grating

2014 ◽  
Author(s):  
Elton Soares de Lima Filho ◽  
Galina Nemova ◽  
Sébastien Loranger ◽  
Raman Kashyap
Keyword(s):  
Fiber Bragg Grating ◽  
Direct Measurement ◽  
Laser Cooling ◽  
Atmospheric Pressure ◽  
Bragg Grating

Monitoring the junction temperature of an IGBT through direct measurement using a fiber Bragg grating

2011 ◽  
Author(s):  
João P. Bazzo ◽  
Tiago Lukasievicz ◽  
Marcio Vogt ◽  
Valmir de Oliveira ◽  
Hypolito J. Kalinowski ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Direct Measurement ◽  
Junction Temperature ◽  
Bragg Grating

scholarly journals A Novel Fiber Bragg Grating Based Sensing Methodology for Direct Measurement of Surface Strain on Body Muscles during Physical Exercises

2012 ◽  
Vol 6 (3) ◽  
pp. 189-198 ◽  
Author(s):  
Guru Prasad Arudi Subbarao ◽  
Omkar Subbaramajois Narasipur ◽  
Anand Kalegowda ◽  
Sundarrajan Asokan
Keyword(s):  
Fiber Bragg Grating ◽  
Direct Measurement ◽  
Surface Strain ◽  
Bragg Grating ◽  
Physical Exercises

COMPARISON OF WATER LEVEL MEASUREMENT PERFORMANCE FOR TWO DIFFERENT TYPES OF DIAPHRAGM USING FIBER BRAGG GRATING BASED OPTICAL SENSORS

2016 ◽  
Vol 78 (6-11) ◽  
Author(s):  
Odai Falah Ameen ◽  
Marwan Hafeedh Younus ◽  
RK Raja Ibrahim ◽  
Rosly Abdul Rahman
Keyword(s):  
Water Level ◽  
Fiber Bragg Grating ◽  
Optical Sensors ◽  
Atmospheric Pressure ◽  
Column Height ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Level Measurement ◽  
Different Types ◽  
Different Levels

A sensor head incorporating a diaphragm was designed and fabricated for water level measurement. It operates in the range of 0-70 cm column height, equivalent to a pressure in atmospheric pressure of 0-6.86 kPa. The fiber Bragg grating (FBG) was attached on the two types of diaphragm to detect the change in the hydrostatic pressure caused by water at different levels. The diaphragms performance by comparing the sensitivity in within the mentioned range. Optical spectrum analyzer (OSA) was used to record the shift in the Bragg wavelength at different water level. The sensitivity of water level measurement using a silicone rubber diaphragm found to be 9.81 pm/cm for 70 cm in water level, while the sensitivity for polymer plastic diaphragm found to be 2 pm/cm at the same level.

scholarly journals Experimental Strain Measurement Approach Using Fiber Bragg Grating Sensors for Monitoring of Railway Switches and Crossings

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3639
Author(s):  
Abdelfateh Kerrouche ◽  
Taoufik Najeh ◽  
Pablo Jaen-Sola
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental Tests ◽  
Cost Effective ◽  
Measuring Method ◽  
Bragg Grating ◽  
Railway Network ◽  
System Failures ◽  
Railway Infrastructure ◽  
Train Speed ◽  
And Control

Railway infrastructure plays a major role in providing the most cost-effective way to transport freight and passengers. The increase in train speed, traffic growth, heavier axles, and harsh environments make railway assets susceptible to degradation and failure. Railway switches and crossings (S&C) are a key element in any railway network, providing flexible traffic for trains to switch between tracks (through or turnout direction). S&C systems have complex structures, with many components, such as crossing parts, frogs, switchblades, and point machines. Many technologies (e.g., electrical, mechanical, and electronic devices) are used to operate and control S&C. These S&C systems are subject to failures and malfunctions that can cause delays, traffic disruptions, and even deadly accidents. Suitable field-based monitoring techniques to deal with fault detection in railway S&C systems are sought after. Wear is the major cause of S&C system failures. A novel measuring method to monitor excessive wear on the frog, as part of S&C, based on fiber Bragg grating (FBG) optical fiber sensors, is discussed in this paper. The developed solution is based on FBG sensors measuring the strain profile of the frog of S&C to determine wear size. A numerical model of a 3D prototype was developed through the finite element method, to define loading testing conditions, as well as for comparison with experimental tests. The sensors were examined under periodic and controlled loading tests. Results of this pilot study, based on simulation and laboratory tests, have shown a correlation for the static load. It was shown that the results of the experimental and the numerical studies were in good agreement.

A Fiber Bragg Grating acceleration sensor with temperature compensation

Optik ◽  
2021 ◽  
pp. 166993
Author(s):  
Xianfeng Zhao ◽  
Zhen’an Jia ◽  
Wei Fan ◽  
Wangfei Liu ◽  
Hong Gao ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Bragg Grating ◽  
Acceleration Sensor
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