Abstract
To date, no printable chipless Radio Frequency Identification (RFID) sensor-related publications in the current literature discuss the possibility of thermocouple integration, particularly for the use in extreme environments. Furthermore, the effects of a time-dependent stimulus on the scattering parameters of a chipless RFID have never been discussed in the known literature. This work includes a review of possible methods to achieve this goal and the design and characterization of a Barium Strontium Titanate (BST) based VHF/UHF voltage sensing circuit. Proof-of-concept thermocouple integration was attempted, and subsequent testing was performed using a signal generator. These subsequent tests involved applying ramp and sinusoid voltage waveforms to the circuit and the characteristics of these signals are largely extracted from the scattering response. Overall conclusions of this paper are that thermocouple integration into chipless RFID technology is still a significant challenge and further work is needed to identify methods of thermocouple integration. With that being said, the developed circuit shows promise as being capable of being configured into a conventional chipless RFID DC voltage sensor.
Highlights
This paper sets out to develop and test possible methods capable of interfacing thermocouple and chipless Radio Frequency Identification (RFID) technology
It would appear that the voltage response is largely linear, but it can be seen that this linearity is weaker at voltages below 500 mV. These tests were performed on both fabricated tags and slight deviations do exist in the resonant response
This is not of grave concern when operating with voltages up to 2.5 V, they are significant when operating in the millivolt range
Summary
This paper sets out to develop and test possible methods capable of interfacing thermocouple and chipless Radio Frequency Identification (RFID) technology. Many works prior to this have reviewed chipless RFID tags, including that by Herrojo et al in [1] and the work of these authors in [2] Both thermocouple and chipless RFID technologies have been printed in-situ using various means, which opens the possibility that a future sensor implementation could be completely printable. The proof-of-concept design is designed and tested in this work and the sensor is used to investigate how a time-varying stimulus can be appropriately detected from a single dataset. This latter result opens up the possibility that the interrogation requirements of a multi-sensor environment could be reduced by decreasing the interrogation times of each individual sensor and freeing up the reader system to read other sensors in a timely manner. This work makes use of a fully wired RFID tag/circuit as it would lead to a more robust characterization of the sensor than its wireless counterpart
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