Recently, many accidents were reported that some passengers were unfortunately restrained and killed at the gaps
between the Platform Screen Doors (PSDs) and the doors of the subway trains. In this paper, one proposal of real time
monitoring system based on optical time domain reflectrometer (OTDR) to detect the intrusions at these gaps is
presented. In this method the locations and weight of intrusions can be obtained by detecting the abrupt power loss of
backscattering light caused by the weight of intrusions upon the microbending sensor heads. This method can be easily
multiplexed and extended into a multi-function sensing system, such as monitoring the temperature, smoking and the
strains in the tracks, or applied in other fields, such as escalators, board gates for ferries or planes.
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