Passive Digital Sensing Method and Its Implementation on Passive RFID Temperature Sensors

Benefitting from the advancement of digital electronics in the 20 th century, sensors have also gradually evolved from analog to digital. As semiconductor components are required in digital sensors, a power supply is still needed for the sensor. To eliminate the need for a power supply a concept of...

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Bibliographic Details
Published in:IEEE sensors journal 2020-11, Vol.21 (4)
Main Authors: Zhu, Wenge, Zhang, Qi, Matlin, Mark, Chen, Yizheng, Wu, Yongji, Zhu, Xuran, Zhao, Huijuan, Pollack, Rich, Xiao, Hai
Format: Article
Language:English
Subjects:
Digital sensor
OTHER INSTRUMENTATION
passive sensor
RFID
temperature sensor
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Summary:Benefitting from the advancement of digital electronics in the 20 th century, sensors have also gradually evolved from analog to digital. As semiconductor components are required in digital sensors, a power supply is still needed for the sensor. To eliminate the need for a power supply a concept of passive digital sensing is proposed. Different from the semiconductor-based electrical digital sensing method, the parameter to be measured is first converted to a mechanical signal, then the mechanical signal is encoded to multiple digital bits by a passive digitizer, where each bit is identified as open or short state that is detectable by general IO ports. To demonstrate the proposed sensing concept, a passive RFID temperature sensor is implemented using a bimetallic coil as the temperature sensing unit. The 6-bit binary codes are acquired and transmitted by a passive RFID that is powered by an energy harvester. Furthermore, the test results show that the temperature sensor has a measurement sensitivity of 1.32 °C/bit and a working distance over 10 meters.
ISSN:1558-1748
1558-1748