Monitoring System of Railway Using Passive RFID in UHF Band

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  • 電波型パッシブRFIDによる電車線路設備のモニタリングシステム
  • デンパガタ パッシブ RFID ニ ヨル デンシャ センロ セツビ ノ モニタリング システム

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Abstract

This paper presents a novel temperature measurement system based on passive RFID operating at UHF band for monitoring system of conventional railways. The goal of this study is to realize wireless temperature measurement using UHF-band RFID whose communication distance is several meters under the assumption that the RFID reader/writer (R/W) has 4 W EIRP. A low power temperature measurement circuit, which is vital for the above purpose, has been developed using a thermistor and comparator. The temperature measured by this sensor, ranging from zero to 80 Celsius, is shown to be in good agreement with theoretical value. The consumption power of this circuit is evaluated to be 8 μW by experiment. The sensor circuit is connected to an IC tag, which composed of a meander line antenna, whose shape has been optimized by genetic algorithm, Cockcroft-Walton circuit for booster and rectifier, and PIC for digital control. It is shown that the present wireless sensing system works well when distance between the IC tag and R/W, whose gain is 13 dBi, is set to 1 m and input power to R/W is 1 mW. From this result, the communication distance for 4 W EIRP is roughly estimated to be more than 10 m when neglecting polarization losses and other negative effects.

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