Wireless passive humidity monitoring method of cable intermediate joint based on RFID
Aiming at the problem of operation failure caused by moisture in the cable intermediate joint,a passive humidity monitoring method based on 13.56 MHz RFID technology is proposed.In this paper,the sensor model is established by HFSS,the antenna turns are adjusted to make the antenna reach the optimal state,the method of antenna resonance matching is proposed.Then,the transmission effect of the sensor antenna in water and the influence of metal on the antenna performance in the presence of metal shielding layer are studied.Finally,the designed sensor is placed inside the intermediate joint for performance test.The results show that the sensor has the best performance when the antenna turn distance is 0.6 mm;adding a 47 μH capacitor outside the antenna can achieve 13.56 MHz resonance matching;the sensor antenna has a good transmission effect in water;adding a metal shielding layer can reduce the inhibitory effect of metal on the signal transmission path.The actual measurement distance can reach 8.2 cm,the maximum humidity measurement error is 0.48%,the maximum fluctuation range is only 0.3%.The sensor can still be accurately measured in the long-term high humidity environment.The method can realize the direct,rapid and passive measurement of the humidity inside the cable intermediate joint.The method is of great significance to prevent the cable from being damp.
intermediate jointRFIDhumidity monitoringwireless communication
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