Sensor distribuido para la detección de esfuerzos de umbral mediante rejillas de Bragg

Abstract

For early warning and alarm systems, it is required to detect appearance of the monitored parameter, such as temperature or strain, within some predetermined interval. A system must generate an alarm signal when the monitored parameter approaches near or crosses the limit of the dangerous zone. For such applications, we propose a simple distributed sensor based on a large array of equal Bragg gratings. An interrogation of the sensor is performed at a fixed wavelength. We discuss a principle of operation of the sensor and present results of experimental demonstration of this technique for distributed detection of excess strain.