scholarly journals Simultaneous Measurement of Distributed Temperature and Strain through Brillouin Frequency Shift Using a Common Communication Optical Fiber

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Leijun Hu ◽  
Liwen Sheng ◽  
Jisong Yan ◽  
Ligong Li ◽  
Ming Yuan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Applied Strain ◽  
Fiber Optic Sensor ◽  
Fiber Sensors ◽  
Optic Sensor ◽  
Excellent Candidate ◽  
Potential Applications ◽  
The Difference ◽  
Distributed Strain

A multiparameter Brillouin fiber-optic sensor for distributed strain and temperature information measuring based on spontaneous scattering in a common communication optical fiber (the G. 652. D commercial fiber) is presented and experimentally demonstrated. Benefiting from the difference of the temperature and strain sensitivity from different Brillouin peaks with different acoustic modes, our proposed sensing configuration can be used to distinguish ambient temperature and applied strain at the same time, which is an excellent candidate to address the problem of cross-sensitivity in the classical Brillouin system. In the experimental section, using a 21.8 km sensing length of communication optical fiber, a temperature accuracy of 1.13°C and a strain accuracy of 21.46 με are obtained simultaneously. Considering the performance we achieved now, the proposed innovation and experimental setup will have some potential applications in the field of fiber sensors.

Construction and Evaluation of the Fiber-Optic Sensor System for Chemical Vapor Detection

2008 ◽  
Vol 55-57 ◽  
pp. 509-512 ◽  
Author(s):  
M. Kittidechachan ◽  
I. Sripichai ◽  
W. Supakum ◽  
S. Thuamthai ◽  
Suppalak Angkaew ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Chemical Vapor ◽  
Fiber Optic Sensor ◽  
Sensor System ◽  
Laser Source ◽  
Vapor Concentration ◽  
Vapor Detection ◽  
Optic Sensor ◽  
Butyl Amine

The fiber optic sensor system for chemical vapor detection was desiged and constructed. The system consisted of three parts; the optic unit, the fiber-optic sensing head and the flow controlling unit. The optic unit included a He-Ne laser source which lazes a red laser into an aligned optical fiber, a photo detector, and a signal processing with computer interface controlled by the Labview® program version 7.1. The sensing head was made of a polyaniline thin film coated onto the de-cladded section of an optical fiber covered by a gas mixing cell. The concentration of measured gas was controlled by varying nitrogen gas flow rate. The nitrogen flow controller was set-up to obtain vapor concentration in the range of 0.04 to 0.40 % v/v. Vapors of hydrochloric acid (HCl) and n-butyl amine (a weak base) were used to test the performance of the sensor system. It was found that output intensity increases with an increasing HCl concentration and decreases with increasing n-butyl amine concentration. The response toward the amine vapor was faster than that of the HCl vapor (23 seconds for n-butyl amine and 72 seconds for HCl). Experiments performed at various concentrations of amine vapor (between 0.04 to 0.21 %v/v) found that a higher concentration yields faster response time.

Application of Fiber Optic BOTDA Sensor for Fire Detection in a Building

2006 ◽  
Vol 321-323 ◽  
pp. 212-216
Author(s):  
Il Bum Kwon ◽  
Chi Yeop Kim ◽  
Dae Cheol Seo
Keyword(s):  
Temperature Distribution ◽  
Optical Fiber ◽  
Fiber Optic ◽  
Smart Structures ◽  
Fire Detection ◽  
Fiber Optic Sensor ◽  
Sensor System ◽  
Real Time Processing ◽  
Optic Sensor ◽  
Electro Optic

Smart structures are to be possessed many functions to sense the external effects, such as seismic loads, temperature, and impact by some explosion, influenced on the safety of structures. This work was focused on the development of a sensing function of smart structures to get the temperature distribution on structures to detect fire occurrences. A fiber optic BOTDA (Brillouin Optical Time Domain Analysis) sensor system was developed to detect the fire occurrence by measuring the temperature distribution of a building’s exterior surfaces. This fiber optic sensor system was constructed with a laser diode and two electro-optic modulators, which made this system faster than systems using only one electro-optic modulator. The temperature distributed on an optical fiber can be measured by this fiber optic BOTDA sensor. An optical fiber, 1400 m in length, was installed on the surface of a building. Using real-time processing of the sensor system, we were able to monitor temperature distribution on the building’s surfaces, and changes in temperature distribution were also measured accurately with this fiber optic sensor.

scholarly journals Optical Fiber Based Mach-Zehnder Interferometer for APES Detection

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5870
Author(s):  
Huitong Deng ◽  
Xiaoman Chen ◽  
Zhenlin Huang ◽  
Shiqi Kang ◽  
Weijia Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
External Environment ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Mach Zehnder Interferometer

A 3-aminopropyl-triethoxysilane (APES) fiber-optic sensor based on a Mach–Zehnder interferometer (MZI) was demonstrated. The MZI was constructed with a core-offset fusion single mode fiber (SMF) structure with a length of 3.0 cm. As APES gradually attaches to the MZI, the external environment of the MZI changes, which in turn causes change in the MZI’s interference. That is the reason why we can obtain the relationships between the APES amount and resonance dip wavelength by measuring the transmission variations of the resonant dip wavelength of the MZI. The optimized amount of 1% APES for 3.0 cm MZI biosensors was 3 mL, whereas the optimized amount of 2% APES was 1.5 mL.

scholarly journals Questions of application of fiber-optic sensors for monitoring crack growth during rock deformations

2021 ◽  
Vol 2140 (1) ◽  
pp. 012037
Author(s):  
V V Yugay ◽  
P Sh Madi ◽  
S B Ozhigina ◽  
D A Gorokhov ◽  
A D Alkina
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Single Mode ◽  
Mechanical Action ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Mountain Range ◽  
Mining Equipment ◽  
Optic Sensor ◽  
Rock Deformations

Abstract The paper considers ways to solve the problem of developing a system for monitoring displacement in quarries, which are the main main cause of the collapse of boards and berms in quarries. To ensure safety and constant monitoring during work at the quarry, there are chiseled fiber-optic sensors. The fiber-optic sensor is made on the basis of a single-mode optical fiber, which makes it possible to measure the displacements of the mountain range at distances of about 30 km with high accuracy. Laboratory sample a fiber-optic sensor in its work uses a method for monitoring additional losses that occur during mechanical action on an optical fiber. The fiber-optic sensor was made to show a fairly high linearity and accuracy during measurements and can be used to control the deformation of the array after appropriate refinement of its design. This article is aimed at creating means of controlling the process of deformation and displacement of a mountain massif. Ultimately, the results of the study will help prevent accidents associated with the collapse of the sides. Since the growth of cracks in the rocks of the bort mountain massif leads to its sudden collapse and creates a significant danger for personnel, it also causes the failure of mining equipment.

An Optical Fiber Sensor for Measuring Light Absorption in Suspension Solutions

2011 ◽  
Vol 121-126 ◽  
pp. 2509-2513
Author(s):  
Fei Bing Xiong ◽  
N Djeu ◽  
Wen Zhang Zhu
Keyword(s):  
Optical Fiber ◽  
Glassy Carbon ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensor ◽  
Fiber Sensor ◽  
Graphite Flake ◽  
Chemical Information ◽  
Carbon Particles ◽  
Optic Sensor

An optical fiber sensor based on attenuated total reflectance (ATR) for extraction chemical information from highly scattering turbid materials has been evaluated. The influence of particles on bulk absorption and ATR transmitted spectra of micron-sized graphite flakes and spherical glassy carbon suspensions were investigated. The ATR transmitted spectra of coiled fiber-optic sensor in those suspensions with various concentrations are insensitive to scattering of suspended particles, especially for graphite flake suspensions. The reason for different influence of graphite flakes and spherical glassy carbon particles suspensions on e ATR spectra analyzed. This study demonstrates that fiber-optic sensor based on ATR technique is a feasible technique in application for monitoring turbid suspensions.

Implementation of Pressure Sensor of Optical Fiber Using Optical Interferometer

2020 ◽  
Vol 398 ◽  
pp. 125-130
Author(s):  
S. Al-Ithawi ◽  
A. Hadi
Keyword(s):  
Optical Fiber ◽  
Pressure Sensor ◽  
Electromagnetic Waves ◽  
Main Parameter ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Strain Effect ◽  
Optical Interferometer ◽  
Optic Sensor ◽  
Fabry Perot

In present work, two types of Interferometric Fiber Optic Sensor (Fabry – Perot & Modal Sensor) have been demonstrate and investigated. The main parameter studied of this contribute is the sensitivity, the strain could be induced by make a stress on the optical fiber. The strain effect at the fiber due to variation of the intensity in the output of the optical fiber. Then, the modes of electromagnetic waves that propagate in the fiber could be analyzed to determine the sensitivity depend on fringe rates. I conclude from this study the Extrinsic Fabry – Perot Interferometry structure is more sensitive than Modal Sensor.

Sign in / Sign up

Export Citation Format

Share Document