Detecting approaching train during track work - uses acoustic sensors, whose output signals are fed to alarm system after amplification

摘要

The source of danger, such as approaching train, is detector by electro-acoustic transducers (4), acting as noise sensors. Their output signals are amplified and fed to an alarm system (9,11) to generate warming signals. The transducers react to train generator noise and to irregularities in the rail track. The transducers are fitted to the track rails. Their output signals are connected via links (5) to the inputs of an amplifier (61, behind which are linked a signal processor (7), an alarm threshold logic (8), and an acoustic and/or optical alarm generator (9). The amplifier sound output coupled to loudspeaker (II) via an LF amplifier (10). ADVANTAGE - For increased safety during work on rail track, with an economical and reliable worming of approaching danger.