IR sensor array for detecting obstacles in railways

J.JESÚS GARCÍA; JESÚS UREÑA; ÁLVARO HERNÁNDEZ; MANUEL MAZO; J.CARLOS GARCÍA; FERNANDO ÁLVAREZ; J. ANTONIO JIMÉNEZ; PATRICIO DONATO; Mª CARMEN PÉREZ

Toulouse (Francia)

Otro; Seminario Anual de Automática, Electrónica Industrial e Instrumentación (SAAEI-EPF 2004), Undécima edición; 2004

Universitat Rovira i Virgili - LAAS/CNRS

This work describes an infrared sensor array, which allows obstacles to be detected on railways. The sensorial system consists of an emitting barrier and a receiving one, placed at both opposite sides of the railway. The methodof obstacle detection is based on the lack of reception in detectors. It is necessary a codification method for the emission in order to detect the reception or the nonreception of transmissions between an emitter and areceiver. In this case complementary sequence pairs are used, suitably adapted for their simultaneous emission through the transmission channel. A high reliability under adverse conditions is achieved with the developed system, being possible to detect the presence of obstacles, and toinform about their situation, according to the geometrical distribution of the sensor array.