Novel Integrated System of RFID Tag and Self-Powered Oxygen Sensor Indicator

Abstract

Abstract.Recently, the combination of passive RFID tags with sensors has been absolutely required in various fields as well as distribution. In this study, we develop a novel sensor-type oxygen indicator based on a battery, which changes both color and electric signals depending on oxygen concentration, and propose the combined system of the self-powered oxygen sensor indicator with a passive UHF band RFID tag. Using this system, we monitored the oxygen concentration in a plastic package with oxygen absorber. The experimental results show that this novel system functions well.

Integration of an oxygen indicator sensor with a passive UHF band RFID tag

“…The full cell of the oxygen indicator sensor was assembled and examined under the conditions with different oxygen concentrations. Depending on the oxygen concentration, the oxygen indicator sen-sor showed different colors and generated a voltage and current proportional to the concentration of oxygen [6][8]. Figure 4 is a photograph of the combined system including the oxygen indicator sensor and the passive RFID tag.…”

“…The full cell of the oxygen indicator sensor was supplied with mixed gases containing different concentrations of oxygen using an automatic gas mixing system (Sehwa Hightech, Korea) and the oxygen concentrations were measured and verified using an oxygen gas analyzer (CheckPoint II, PBI-Dansensor, Denmark). The cell voltage and current density were measured using the multi-channel potentiostat/galvanostat [6] [8].…”

“…The modulator transmits a digital signal of MSP430 to the reader using the backscatter method. Finally, the MSP430 processes the sensor data and converts it to digital data [6], [10]. Due to the loss of signal strength over trans-mission distance, there is potentially very little power available for the tag.…”

“…Recently RFID has been developed in combination with sensors to create smart RFID tags [4] [5]. In this respect, the connection of an oxygen indicator with a passive UHF band RFID tag is certainly required in various fields in addition to food distribution [6] [7].…”

“…For the creation of smart RFID tags, we develop a new oxygen indicator sensor which not only changes color in the presence of oxygen but also generates electrical signals (voltage and current) in proportion to the oxygen concentration levels. This colorimetric oxygen sensor is integrated with a passive RFID tag in the UHF band [6] [8]. Our system consists of a colorimetric oxygen sensor, a UHF band RFID tag, an interface circuit, a reader, and a server.…”