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ID Integrated Batteryless Wireless Digital pH Sensor
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DOI：10.1109/JSEN.2019.2939926.png)
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Abstract
En 中文
In this paper, an identification integrated pH sensor tag is presented for wireless pH sensing applications. Two electrodes based on silver/silver chloride and antimony/antimony oxide were fabricated using the standard lithography process. The electrode pair showed a linear response for different pH solutions ranging from 4.3 to 10.7 with a sensitivity of 46 mV/pH. The passive pH sensor tag was implemented using a transceiver antenna, an energy harvesting circuit and a low power digital modulation circuit. The digital modulation circuit generates an identification and converts the analog pH voltage into 8-bit digital bits. The pH sensor tag demonstrated wireless digital bit transfer at a data rate of 0.595 Kbps. No external battery power is required to activate and operate the sensor tag and hence the sensor tag is passive in nature. In a complete wireless measurement setup, a read range of 45 cm was achieved for the sensor tag at transmit power of 15 dBm. The prototype was fabricated by integrating sensor and discrete components on top of a low cost PCB.
Keywords:
Sensors
Electrodes
Wireless sensor networks
Wireless communication
Radio frequency
Fabrication
Metals
pH sensor
energy harvesting
wireless
batteryless
RFID
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