scholarly journals LONG-TERM MONITORING OF AN URBAN EXPRESSWAY BRIDGE USING OPTICAL FIBER SENSOR SYSTEM

2015 ◽  
Vol 71 (3) ◽  
pp. 416-428
Author(s):  
Chitoshi MIKI ◽  
Yusuke KOTO ◽  
Eiichi SASAKI ◽  
Kazunari SAITO ◽  
Yuji ISHIKAWA
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Sensor System ◽  
Fiber Sensor ◽  
Urban Expressway ◽  
Long Term Monitoring ◽  
Term Monitoring

A Multiplexed Optical Fiber Sensor System For Distributed Measurement Of Structural Strains

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari ◽  
Z. Chen ◽  
Q. Li
Keyword(s):  
Optical Fiber ◽  
Optical Switch ◽  
Optical Fiber Sensor ◽  
Fiber Material ◽  
Smart Structure ◽  
Sensor System ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Large Structures ◽  
Distributed Measurement

ABSTRACTStructurally integrated optical fiber sensors form the basis for smart structure technology. Over the past decade a variety of sensor configurations have been developed for measurement of strains and deformations in structures. Strains and deformations alter the refractive index and the geometry of the optical fiber material. These changes perturb the intensity, phase, and polarization of the light-wave propagating along the probing fiber. The optical perturbations are detected for the determination of strain. The research presented here describes the development of a new optical fiber sensor system for measurement of structural strains based on white light interferometry. An optical switch provides for multiplexing of strain signals from various locations in the structure. Redundant Bragg grating type fiber optic sensors as well as strain gauges were employed for comparison and verification of strain signals as measured by the new system. The system provides capability for distributed sensing of strains in large structures.

scholarly journals An Optical Fiber Sensor Based on La2O2S:Eu Scintillator for Detecting Ultraviolet Radiation in Real-Time

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3754 ◽  
Author(s):  
Yongji Yan ◽  
Xu Zhang ◽  
Haopeng Li ◽  
Yu Ma ◽  
Tianci Xie ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Response Time ◽  
Electromagnetic Interference ◽  
Uv Light ◽  
Optical Fiber Sensor ◽  
Temperature Response ◽  
Superior Performance ◽  
Fiber Sensor ◽  
Uv Detectors

A novel ultraviolet (UV) optical fiber sensor (UVOFS) based on the scintillating material La2O2S:Eu has been designed, tested, and its performance compared with other scintillating materials and other conventional UV detectors. The UVOFS is based on PMMA (polymethyl methacrylate) optical fiber which includes a scintillating material. Scintillating materials provide a unique opportunity to measure UV light intensity even in the presence of strong electromagnetic interference. Five scintillating materials were compared in order to select the most appropriate one for the UVOFS. The characteristics of the sensor are reported, including a highly linear response to radiation intensity, reproducibility, temperature response, and response time (to pulsed light) based on emission from a UV source (UV fluorescence tube) centered on a wavelength of 308 nm. A direct comparison with the commercially available semiconductor-based UV sensor proves the UVOFS of this investigation shows superior performance in terms of accuracy, long-term reliability, response time and linearity.

Polymer Optical Fiber Sensor System for Multi Plane Bending Angle Assessment

2020 ◽  
Vol 20 (5) ◽  
pp. 2518-2525
Author(s):  
Arnaldo G. Leal-Junior ◽  
Leticia M. Avellar ◽  
Camilo A. R. Diaz ◽  
Maria Jose Pontes ◽  
Anselmo Frizera
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Sensor System ◽  
Fiber Sensor ◽  
Polymer Optical Fiber ◽  
Bending Angle ◽  
Plane Bending

scholarly journals Analyses of carboxylic acid esters and lubricants using a gold-coated optical-fiber sensor system.

2000 ◽  
Vol 49 (5) ◽  
pp. 307-311 ◽  
Author(s):  
Masaru MITSUSHIO ◽  
Toshifumi YOSHIDOME ◽  
Satsuo KAMATA
Keyword(s):  
Carboxylic Acid ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Sensor System ◽  
Fiber Sensor ◽  
Acid Esters

Evaluation of Bolt Strength Characteristics in Bolted Joints Using an Optical Fiber Sensor System

2019 ◽  
Author(s):  
Atsushi Shirakawa ◽  
Toshiyuki Sawa
Keyword(s):  
Optical Fiber ◽  
Strain Distribution ◽  
Force Measurement ◽  
Optical Fiber Sensor ◽  
Effective Cross Section ◽  
Tensile Load ◽  
Bolted Joints ◽  
Strength Characteristics ◽  
Sensor System ◽  
Fiber Sensor

Abstract Bolted joints are used in many industrial products such as mechanical structures, automobiles, airplanes, chemical plants, and so on. In many cases, after the design of new products is finished, various tests on the bolt and bolted joints are carried out using actual parts to prevent accidents due to bolt loosening and fracture. At the same time, in the strength tests, external force measurement, axial bolt force measurement and so on are included. However, there are no advanced tests in which axial bolt strain distribution or bolt elongation in actual parts and so on are measured. Therefore, in this research, a new method for evaluating bolt strength characteristics using an optical fiber sensor system capable of measuring actual parts is demonstrated. First, a tensile strength test using an optical fiber sensor is carried out to measure strain distribution in a bolt, and a maximum strain value position in the measured clamp load-strain curve is shown. Then, the elongation at each part of the bolt is shown. Next, yield clamp bolt force is found using this sensor system in torque/clamp force testing. In addition, the measured yield clamp bolt force is compared with the values in the conventional measurement method and in the estimation formula. Also, discussed is the effective cross section area by which the stress at the engaged threads is calculated under tensile load. Finally, another case where an optical fiber sensor system is used for bolt fastening evaluation is discussed.

High-stability optical fiber sensor system

1991 ◽  
Author(s):  
Yu-Feng Chen ◽  
Yue-kun Liang ◽  
Hong Bian
Keyword(s):  
Optical Fiber ◽  
High Stability ◽  
Optical Fiber Sensor ◽  
Sensor System ◽  
Fiber Sensor
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