Theory of a novel high sensitivity optical fibre gyroscope

1993 ◽  
Vol 140 (2) ◽  
pp. 150 ◽  
Author(s):  
A. Yu ◽  
A.S. Siddiqui
Keyword(s):  
Optical Fibre ◽  
High Sensitivity

scholarly journals High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm

2021 ◽  
Vol 29 (3) ◽  
pp. 4105
Author(s):  
Laura F. J. Aime ◽  
Thomas Kissinger ◽  
Stephen W. James ◽  
Edmon Chehura ◽  
Alberto Verzeletti ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Pressure Measurement ◽  
High Sensitivity ◽  
Optical Fibre Sensors

scholarly journals High sensitivity temperature sensor based on a polymer filled hollow core optical fibre interferometer

2017 ◽  
Author(s):  
Rahul Kumar ◽  
Wai Pang Ng ◽  
Yong-Qing Fu ◽  
Jinhui Yuan ◽  
Chongxiu Yu ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Temperature Sensor ◽  
High Sensitivity ◽  
Hollow Core

scholarly journals Simultaneous Vector Bend and Temperature Sensing Based on a Polymer and Silica Optical Fibre Grating Pair

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3507 ◽  
Author(s):  
Binbin Yan ◽  
Guoqiang Liu ◽  
Jun He ◽  
Yanhua Luo ◽  
Liwei Yang ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Temperature Sensitivity ◽  
High Sensitivity ◽  
Temperature Sensing ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Temperature Changes ◽  
The Difference ◽  
Grating Pair ◽  
Bending Response

The bending response of polymer optical fibre Bragg grating (POFBG) and silica optical fibre Bragg grating (SOFBG) mounted on a brass beam have been systematically studied and compared. The results indicate that POFBG has higher (almost twice as much) bend sensitivity than SOFBG. Based on the difference between the bend and temperature sensitivity of POFBG and SOFBG, a new method of measuring vector bend and temperature simultaneously was proposed by using a hybrid sensor head with series connection of one POFBG and one SOFBG with different Bragg wavelengths. It provides high sensitivity and resolution for sensing bend and temperature changes simultaneously and independently. The proposed sensor can find some applications in the fields where high sensitivity for both bend and temperature measurements are required.

Low-cost interferometric optical fibre-based sensor for landslide monitoring: laboratory tests under different applications

2020 ◽  
Author(s):  
Vladislav Ivanov ◽  
Laura Longoni ◽  
Maddalena Ferrario ◽  
Marco Brunero ◽  
Monica Papini
Keyword(s):  
Optical Fibre ◽  
Low Cost ◽  
High Sensitivity ◽  
Field Application ◽  
Ground Movement ◽  
Landslide Monitoring ◽  
Monitoring Tool ◽  
Irreversible Damage ◽  
Monitoring Tools ◽  
Mode Of Application

<p>Landslide monitoring must keep pace with the development of technology. The costs of elaborate monitoring tools could however be quite elevated, especially when considering that monitoring instruments in direct contact with the measurand could undergo irreversible damage and thus be obliterated. A variety of landslide monitoring tools based on the optical fibre technology have emerged in the past few decades. While authors tend to focus on the reduced costs of the sensing cables, the economic and practical aspects related to the interrogating systems are often disregarded. In fact, commercially available units are hardly exploitable outside the laboratory. In this regard, we propose a newly developed interferometric optical fibre-based monitoring system which offers high sensitivity strain monitoring at a significantly reduced cost of the instrumentation involved. Moreover, the devised setup could easily be exported for field use. The setup has been tested in controlled conditions as a monitoring tool in a downscaled landslide model. Two major modes of operation have been experimented: a) direct strain sensor where the optical fibre cable undergoes deformation, and b) a high frequency elastic wave detection mode where the sensor is able to distinguish the energetic footprint generated by ground movement. The two experimental schemes indicate that the newly developed sensing system could eventually be put into effective use for a variety of landslide phenomena where the most appropriate mode of application would depend of the circumstances of the problem under investigation. The design of a field application of the monitoring tool are currently underway.</p>

Optical Fiber Oxygen Sensor Based on Ru (II) Complex and Porous Silica Nanoparticles Embedded in Sol-Gel Matrix

2012 ◽  
Vol 516 ◽  
pp. 612-617 ◽  
Author(s):  
Cheng Shane Chu
Keyword(s):  
Silica Nanoparticles ◽  
Optical Fibre ◽  
Oxygen Sensor ◽  
Low Cost ◽  
Sol Gel ◽  
Porous Silica ◽  
High Sensitivity ◽  
Experimental Results ◽  
Pure Oxygen ◽  
Pure Nitrogen

This paper presents a high-sensitivity oxygen sensor that comprises an optical fibre coated at one end with tris (4, 7-diphenyl-1, 10-phenanthroline) ruthenium (II) ([Ru (dpp)3]2+) and porous silica nanoparticles embedded in an n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogel. The sensitivity of the optical oxygen sensor is quantified in terms of the ratio IN2/IO2, where IN2 and IO2 represent the detected fluorescence intensities in pure nitrogen and pure oxygen environments, respectively. The experimental results show that the oxygen sensor has a sensitivity of 26. The experimental results show that compared to oxygen sensor based on Ru (II) complex immobilized in the sol-gel matrix, the proposed optical fibre oxygen sensor has higher sensitivity. In addition to the increased surface area per unit mass of the sensing surface, the porous silica nanoparticles increase the sensitivity because a substantial number of aerial oxygen molecules penetrate the porous silica shell. The proposed optical sensor has the advantages of easy fabrication, low cost, fast response and high sensitivity for oxygen monitoring using a cheap LED as a light source.

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