Year: 2020
Type: article
Abstract: Benefitting from the advancement of digital electronics in the 20thcentury, 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. The test results show that the temperature sensor has a measurement sensitivity of 1.32 °C/bit and a working distance over 10 meters.
Source: IEEE Sensors Journal
Institutions: Clemson University, Phase IV (United States)
Language: English
Topic: RFID technology advancements
Subfield: Media Technology
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Award: G3208386259
OpenAlex ID: W3095659822