A new fibre optic sensor independent of temperature variations and fabricated with fibre Bragg gratings

2004 ◽  
Author(s):  
J. C. Roig ◽  
R. Garcia ◽  
S. Sales ◽  
Jose Capmany ◽  
Beatriz Ortega ◽  
...  
Keyword(s):  
Bragg Gratings ◽  
Fibre Optic ◽  
Temperature Variations ◽  
Fibre Optic Sensor ◽  
Optic Sensor ◽  
Fibre Bragg Gratings

Fibre optic sensors in civil engineering structures

2000 ◽  
Vol 27 (5) ◽  
pp. 880-889 ◽  
Author(s):  
R C Tennyson ◽  
T Coroy ◽  
G Duck ◽  
G Manuelpillai ◽  
P Mulvihill ◽  
...  
Keyword(s):  
Civil Engineering ◽  
Concrete Structures ◽  
Local Strain ◽  
Bragg Gratings ◽  
Fibre Optic ◽  
Engineering Structures ◽  
Arbitrary Length ◽  
Fibre Optic Sensor ◽  
Optic Sensor ◽  
Civil Engineering Structures

This paper presents an overview of the development and application of ISIS fibre optic sensor (FOS) technology by the University of Toronto Institute for Aerospace Studies and Department of Electrical and Computer Engineering. The primary focus of this technology has involved the use of fibre Bragg gratings (FBGs) to measure strain and temperature in concrete structures and fibre reinforced plastic (FRP) overwraps applied to concrete structures. A brief review of existing fibre optic sensor configurations and the advantages of using FOS compared to other strain sensors is first presented. Subsequently, the development of new sensor concepts such as a long gauge of arbitrary length, a distributed gauge for measuring local strain gradients, and multiple FBGs on a single fibre optic cable are discussed, with examples of their application to civil engineering structures. In addition, the specialized instruments under development that are essential for obtaining strain information from these sensors are also described. Finally, the issue of wireless remote monitoring of FOS systems is addressed.Key words: fibre optic sensors, Bragg gratings, civil engineering structures, instrumentation.

Strain Monitoring of FRP Elements Using an Embedded Fibre Optic Sensor

2008 ◽  
Vol 56 ◽  
pp. 435-440 ◽  
Author(s):  
Geert Luyckx ◽  
Eli Voet ◽  
Wim De Waele ◽  
Wim Van Paepegem ◽  
Joris Degrieck ◽  
...  
Keyword(s):  
Strain Field ◽  
Coefficient Matrix ◽  
Fibre Optic ◽  
Fibre Optic Sensor ◽  
Strain Monitoring ◽  
Optic Sensor ◽  
Measured Strain ◽  
Polarization Maintaining ◽  
Fibre Bragg Gratings ◽  
No Sensor

This paper presents a strain monitoring approach for following up FRP elements (in this case a [90°] CFRP laminate) using an embedded fibre optic sensor. The sensor exists of two fibre Bragg gratings (FBGs) written in a polarization maintaining fibre (PMF). First, the strain response of the non-embedded sensor is determined which makes it possible to relate the different bragg peak shifts with the induced strain field in the core of the optical fibre. Secondly, a transfer coefficient matrix is presented and calculated using finite element simulations which relates the measured strain field of the sensor with the adjacent one existing in the structure as if no sensor would be present.

Fibre optic sensor of electrostatic field with mechanical resonator

1994 ◽  
Author(s):  
Alexander V. Churenkov ◽  
Maksim A. Skorobogatiy ◽  
A. D. Loiko
Keyword(s):  
Electrostatic Field ◽  
Fibre Optic ◽  
Mechanical Resonator ◽  
Fibre Optic Sensor ◽  
Optic Sensor

Continuous-flow bioluminescent assay of NADH using a fibre-optic sensor

1989 ◽  
Vol 226 (2) ◽  
pp. 331-336 ◽  
Author(s):  
L.J. Blum ◽  
S.M. Gautier ◽  
P.R. Coulet
Keyword(s):  
Continuous Flow ◽  
Fibre Optic ◽  
Bioluminescent Assay ◽  
Fibre Optic Sensor ◽  
Optic Sensor

POTENTIAL OF BRAGG GRATING SENSORS FOR AIRCRAFT HEALTH MONITORING

2007 ◽  
Vol 31 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Nezih Mrad
Keyword(s):  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Bragg Grating ◽  
Fibre Optic ◽  
Fibre Optic Sensor ◽  
Health Monitoring System ◽  
Structural Health ◽  
Structural Health Monitoring System ◽  
Optic Sensor

The increased requirement to operate military platforms and aerospace structures beyond their designed life imposes heavy maintenance and inspection burden on aircraft operators and owners. In-service structural health monitoring is potentially a cost-effective approach by which service usage information can be obtained and knowledgeable decisions can be made. Advanced sensor technology, such as optical fibres, are expected to provide existing and future aircraft with added intelligence and functionality, reduced weight and cost, enhanced robustness and performance. This paper furthers the understanding of technical and practical issues related to full implementation of a fibre optic sensor based structural health monitoring system for aerospace and military platforms. It also reports experimental findings on the use of fibre Bragg grating sensors for measurement of parameters relevant to aircraft structural monitoring and smart structures; with an emphasis on the suitability of multifunctional fibre optic sensor system. Experimental evaluations revealed that Bragg grating sensors correlate well with conventional sensors technology for temperature, stain, crack growth and cure monitoring and were insensitive to pressures up to 300 psi. These sensors were determined to have minimum impact on the structural integrity when embedded parallel to host fibres into composite laminates. Recommendations on the implementation and integration of these sensors into a structural health monitoring system are also provided.

scholarly journals Investigation of the effects of electromagnetic field treatment of hot spring water for scale inhibition using a fibre optic sensor

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Takuya Okazaki ◽  
Senshin Umeki ◽  
Tatsuya Orii ◽  
Ryusuke Ikeya ◽  
Aya Sakaguchi ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Hot Spring ◽  
Spring Water ◽  
Fibre Optic ◽  
Fibre Optic Sensor ◽  
Optic Sensor ◽  
Scale Inhibition

Fibre optic sensor multiplexing by FMAMCW

1988 ◽  
Vol 21 (10S) ◽  
pp. S144-S146
Author(s):  
R Gallay ◽  
P Sandoz ◽  
P Robert
Keyword(s):  
Fibre Optic ◽  
Fibre Optic Sensor ◽  
Optic Sensor ◽  
Sensor Multiplexing
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