scholarly journals Brillouin Frequency Shift Sensing Technology Used in Railway Strain and Temperature Measurement

2021 ◽  
Vol 11 (15) ◽  
pp. 7101
Author(s):  
Wen-Kuei Hsu ◽  
Yu-Lin Lee ◽  
Tsan-Teng Kuan
Keyword(s):  
Frequency Shift ◽  
Strain Difference ◽  
Single Mode ◽  
Atmospheric Temperature ◽  
Single Mode Fiber ◽  
Temperature Changes ◽  
Fiber Sensing ◽  
Sensing System ◽  
Sensing Technology ◽  
Rail Irregularities

This study and verification are based on the Brillouin frequency shift (BFS), which is related to the strain and temperature changes of a single-mode fiber, because such a shifted frequency can be quantitatively measured and converted to strain and temperature differences. We explain the installation of a Brillouin distributed fiber sensing system (DFOS) on an actual operating railway to measure the temperature and strain of the rail. In addition, the measured data were calculated and analyzed, revealing the geometric irregularity of the tested rail and the location of the abnormality. We obtained a temperature difference of 12.1 °C between the temperature distribution of the measured rail and the atmospheric temperature, and there was a 1.5 h delay between the two. We also obtained rail irregularities ranging from −0.3 to +0.4 mm by calculating the slight strain difference of the rail in this test.

A Novel In-Line Fiber Mach–Zehnder Interferometer Temperature Sensor Made of Thermally Expanded Core Fiber

2014 ◽  
Vol 635-637 ◽  
pp. 856-859 ◽  
Author(s):  
Ying Wu Zhou ◽  
Sheng Yu Chen
Keyword(s):  
Temperature Sensor ◽  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Core Mode ◽  
Temperature Changes ◽  
The Core ◽  
Core Fiber ◽  
Mach Zehnder Interferometer

A novel in-line fiber temperature sensor by splicing a piece of single mode fiber between two thermally expanded core fibers at their core-expanded ends is proposed and demonstrated. This structure forms an all fiber Mach–Zehnder interferometer due to the interference between the core mode and the cladding modes of the single mode fiber. The fabricated sensor is applied to measure temperature changes. The temperature sensitivity of the sensor at a length of 6.3cm is about 65.3 pm/°C. The proposed sensor is low cost, easily fabricated, and may be useful for detection of temperature.

Foresight on Real-Time Monitoring System for Submarine Optical Fiber Cables Based on Fiber Sensing Technology

2013 ◽  
Vol 341-342 ◽  
pp. 1089-1093 ◽  
Author(s):  
Xue Man Fan ◽  
Ying Jian Wang ◽  
Gui Li Wang ◽  
Chang Shu ◽  
Chun Guang Li
Keyword(s):  
Optical Fiber ◽  
Real Time ◽  
Fault Location ◽  
Real Time Monitoring ◽  
Fiber Sensing ◽  
Sensing System ◽  
Sensing Technology ◽  
Vibration Sensing ◽  
Main Factors ◽  
Optimization Schemes

In this paper, the main factors influencing the reliability of submarine optical fiber cables (SOFC) are analyzed, and the significance of the research on real-time monitoring technology of SOFC is illuminated. Also, the principle of distributed double Mach-Zehnder (M-Z) interference vibration sensing system is discussed. Then, the feasibility of the system applied in pre-warning and fault location of SOFC is verified. In view of the main problems of the optical fiber vibration sensing system, two optimization schemes are presented in this paper to improve the performance of the system.

Fiber powered sensing system for a long reach single mode fiber link and non-continuous applications

2014 ◽  
Author(s):  
J. B. Rosolem ◽  
F. R. Bassan ◽  
F. R. Pereira ◽  
R. S. Penze ◽  
A. A. Leonardi ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Sensing System ◽  
Fiber Link

Bend-Induced Brillouin Frequency Shift Variation in a Single-Mode Fiber

2013 ◽  
Vol 25 (23) ◽  
pp. 2362-2364 ◽  
Author(s):  
Aldo Minardo ◽  
Romeo Bernini ◽  
Luigi Zeni
Keyword(s):  
Frequency Shift ◽  
Single Mode ◽  
Single Mode Fiber

scholarly journals All Single-Mode-Fiber Supercontinuum Source Setup for Monitoring of Multiple Gases Applications

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3239
Author(s):  
Javier A. Martin-Vela ◽  
Eloisa Gallegos-Arellano ◽  
Juan M. Sierra-Hernández ◽  
Julián M. Estudillo-Ayala ◽  
Daniel Jauregui-Vázquez ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Experimental Results ◽  
Hitran Database ◽  
Broadband Absorption ◽  
Sensing System ◽  
Absorption Technique

In this paper, a gas sensing system based on a conventional absorption technique using a single-mode-fiber supercontinuum source (SMF-SC) is presented. The SC source was implemented by channeling pulses from a microchip laser into a one kilometer long single-mode fiber (SMF), obtaining a flat high-spectrum with a bandwidth of up to 350 nm in the region from 1350 to 1700 nm, and high stability in power and wavelength. The supercontinuum radiation was used for simultaneously sensing water vapor and acetylene gas in the regions from 1350 to 1420 nm and 1510 to 1540 nm, respectively. The experimental results show that the absorption peaks of acetylene have a maximum depth of approximately 30 dB and contain about 60 strong lines in the R and P branches, demonstrating a high sensitivity of the sensing setup to acetylene. Finally, to verify the experimental results, the experimental spectra are compared to simulations obtained from the Hitran database. This shows that the implemented system can be used to develop sensors for applications in broadband absorption spectroscopy and as a low-cost absorption spectrophotometer of multiple gases.

scholarly journals Polarization dependent Brillouin frequency shift fluctuation induced by low birefringence in single mode fiber

2017 ◽  
Vol 25 (25) ◽  
pp. 31896 ◽  
Author(s):  
Chunhua Wang ◽  
Yunliang Han ◽  
Fufei Pang ◽  
Liang Chen ◽  
Xiaoyi Bao
Keyword(s):  
Frequency Shift ◽  
Single Mode ◽  
Single Mode Fiber
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