Publications

Publications by CTM

2004

<title>Intensity-referenced temperature-independent curvature sensing concept based on chirped gratings embedded in a composite laminate</title>

Authors
Romero, R; Frazao, O; Pereira, DA; Salgado, HM; Araujo, FM; Ferreira, LAA;

Publication
Second European Workshop on Optical Fibre Sensors

Abstract

2004

<title>Evaluation of long-period fiber grating temperature sensors in nuclear environments</title>

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

Publication
Second European Workshop on Optical Fibre Sensors

Abstract

2004

<title>Measurement of the temperature of an optical fiber submitted to an electric arc discharge</title>

Authors
Rego, GM; Marques, PVS; Salgado, HM; Santos, JL;

Publication
Second European Workshop on Optical Fibre Sensors

Abstract

2004

<title>Simultaneous measurement of strain and temperature based on polarization loss properties of arc-induced long-period gratings</title>

Authors
Frazao, O; Rego, GM; Araujo, FM; Ferreira, LA; Salgado, HM; Santos, JL;

Publication
Second European Workshop on Optical Fibre Sensors

Abstract

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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2004

In situ temperature measurement of an optical fiber submitted to electric arc discharges

Authors
Rego, G; Santos, LMNBF; Schroder, B; Marques, PVS; Santos, JL; Salgado, HM;

Publication
IEEE PHOTONICS TECHNOLOGY LETTERS

Abstract
Type S thermocouples were assembled in situ by applying high intensity electric are discharges to the contact junction of two platinum (Pt) and Pt-10% rhodium (Pt-10% Rh) wires, inserted on a silica capillary. The electrically insulated thermocouples built in this way were afterwards employed to estimate the temperature of an optical fiber subjected to arc discharges. For typical values of the arc discharge parameters used to arc-induce long-period fiber gratings (electric current I = 9 mA and arc duration t = 1 s), a capillary peak temperature value of 1420 degreesC +/- 400 degreesC was obtained by extrapolation of the experimental data for the limit situation of having a thermocouple with negligible diameter. The temperature profiles in the capillary and in an optical fiber were calculated based on a heat transfer model implemented by a finite element algorithm and fitted to the experimental temperature distribution in the Pt and Pt-10% Rh wires. The correspondent peak temperatures computed for the capillary and for the fiber were 1450 degreesC and 1320 degreesC, respectively. A good agreement between the capillary temperature values determined graphically and numerically was obtained.

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