Evalation of railroad site application of IoT-based hybrid measurement system

The development of effective safety monitoring systems has attracted considerable attention recently as the importance of safety monitoring systems in social infrastructure and large-scale transportation systems, such as railways and plants, is increasing. Conventional structural health monitoring (SHM) uses a wide range of electrical resistance sensors and other non-destructive testing devices. However, because of the high-voltage electrical environment of railways, these electrical resistance sensors face electromagnetic interference noise. To overcome this limitation, EMI shielding techniques or replaceable optical sensors are under investigation. Moreover, development of a measurement system that can connect to different types of sensors is crucial prior to applying the sensors under development alongside the conventional electrical sensors at the railway site. In prior research, a hybrid measurement system with telecommunication technology was developed for the synchronization of different types of sensors. Furthermore, IoT-based wireless data acquisition is included to communicate sensing data on distant railway sites and monitor them remotely. In this paper, the applicability of the hybrid measurement system is evaluated for applications in railway sites and its utility and performance were tested. The test results showed that, temperature and operating information of the railway are effectively measured by acquiring electrical and optical sensor data using the measurement system. In the future, the IoT-based hybrid measurement system verified in this study could contribute to the enhancement of the stability of railway systems by applying it to various railway sites