Publications

Publications by Gaspar Rego

2004

Micro-displacement measurement using a long period fiber grating in a self-referenced fiber optic intensity sensor

Authors
Cazacu, S; Martins, JM; Rego, G; Santos, SF; Santos, JL; Baptista, JM;

Publication
2004 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2

Abstract
The development of fiber optical sensor in which the sensing head comprises a long period fiber grating (LPG) whose attenuation peak varies as function of its bending was investigated. Various arc-induced LPGs were fabricated in the spectral region of the optical source. The spectral power evolution was taken from a streched to a bending position with the optical spectrum analyzer. The developed fiber optical sensor demonstrated its capability of micro-displacement measurement.

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2005

Optical fiber sensors for nuclear environments

Authors
Rego G.M.; Fernandez A.F.; Santos J.L.; Salgado H.M.; Berghmans F.; Gusarov A.;

Publication
Recent Advances in Multidisciplinary Applied Physics

Abstract

2005

Measurement of the salinity in water through long-period gratings arc-induced in pure-silica-core fibers

Authors
Rego G.; Santos J.; Salgado H.;

Publication
Recent Advances in Multidisciplinary Applied Physics

Abstract

2002

Apodisation of uniform Fibre Bragg Gratings using electric arc discharges

Authors
Rego, G; Romero, R; Frazao, O; Marques, PVS; Salgado, HM;

Publication
PROCEEDINGS OF 2002 IEEE/LEOS WORKSHOP ON FIBRE AND OPTICAL PASSIVE COMPONENTS

Abstract
We report the use of the electric arc technique to apodise Fibre Bragg Gratings (FBG). Electric arc discharges applied at the ends of the grating produce a smoothing of the refractive index modulation profile which reduces the side lobes at longer wavelengths. Using this technique, a FBG was apodised with a side lobe reduction of 17 dB.

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2004

Evaluation of long-period fiber grating temperature sensors in nuclear environments

Authors
Fernandez, AF; Rego, G; Gusarov, A; Brichard, B; Santos, JL; Salgado, HM; Berghmans, F;

Publication
SECOND EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS: PROCEEDINGS

Abstract
We have studied the effect of gamma radiation on Long Period Fiber Grating (LPFG) temperature sensors fabricated in a pure-silica fiber, using the arc discharge technique. The temperature sensitivity of the LPFGs remains unchanged by the irradiation.

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2002

Sampled fibre Bragg grating sensors for simultaneous strain and temperature measurement

Authors
Frazao, O; Romero, R; Rego, G; Marques, PVS; Salgado, HM; Santos, JL;

Publication
ELECTRONICS LETTERS

Abstract
A new scheme is presented for simultaneous measurement of strain and temperature using a sampled fibre Bragg grating based on a long period structure written using the electric are technique. The temperature and strain measurement resolutions are estimated to be +/-0.50degreesC/rootHz and +/-3.38 muepsilon/rootHz, respectively.

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