Hybrid wavelength-time domain interrogation system for multiplexed fiber Bragg sensors using a strain-tuned erbium-doped fiber laser

Nilton Haramoni; Aleksander S. Paterno; Guilherme Soares; Jean C. C. Silva; Hypolito J. Kalinowski

doi:10.1117/12.738581

2 July 2007 Hybrid wavelength-time domain interrogation system for multiplexed fiber Bragg sensors using a strain-tuned erbium-doped fiber laser

Nilton Haramoni, Aleksander S. Paterno, Guilherme Soares, Jean C. C. Silva, Hypolito J. Kalinowski

Author Affiliations +

Proceedings Volume 6619, Third European Workshop on Optical Fibre Sensors; 66193F (2007) https://doi.org/10.1117/12.738581
Event: Third European Workshop on Optical Fibre Sensors, 2007, Napoli, Italy

Abstract

A system for the interrogation of fiber Bragg grating sensors using a strain-tuned EDF laser with linear cavity is described. An optical switch is spliced to one end of the laser cavity and connects one of two high-strength draw-tower fiber Bragg gratings (DTG). The gratings are simultaneously tuned by a stretching device and act as the end reflector of the laser cavity. By applying a ramp signal to the actuator synchronized to the optical switch, the laser signal sweeps over two different wavelength intervals, depending on the connected DTG. This approach represents a hybrid wavelength-time domain interrogation for multiplexed sensors and doubles the number of sensors that may be addressed when compared with single DTG scanning. In addition, the use of the DTG allows a fivefold increase in the strain tuned wavelength interval over standard fiber Bragg gratings. An example application is demonstrated where the temperature in an electrical motor is measured during the machine operation.

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Nilton Haramoni, Aleksander S. Paterno, Guilherme Soares, Jean C. C. Silva, and Hypolito J. Kalinowski "Hybrid wavelength-time domain interrogation system for multiplexed fiber Bragg sensors using a strain-tuned erbium-doped fiber laser", Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66193F (2 July 2007); https://doi.org/10.1117/12.738581

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