標題: A Wirelessly Powered Smart Contact Lens with Reconfigurable Wide Range and Tunable Sensitivity Sensor Readout Circuitry
作者: Chiou, Jin-Chern
Hsu, Shun-Hsi
Huang, Yu-Chieh
Yeh, Guan-Ting
Liou, Wei-Ting
Kuei, Cheng-Kai
電機工程學系
電控工程研究所
Department of Electrical and Computer Engineering
Institute of Electrical and Control Engineering
關鍵字: capacitance-to-digital converter (CDC);capacitive sensor;soft contact lens;UHF RFID Class1 Gen2
公開日期: 1-一月-2017
摘要: This study presented a wireless smart contact lens system that was composed of a reconfigurable capacitive sensor interface circuitry and wirelessly powered radio-frequency identification (RFID) addressable system for sensor control and data communication. In order to improve compliance and reduce user discomfort, a capacitive sensor was embedded on a soft contact lens of 200 mu m thickness using commercially available bio-compatible lens material and a standard manufacturing process. The results indicated that the reconfigurable sensor interface achieved sensitivity and baseline tuning up to 120 pF while consuming only 110 mu W power. The range and sensitivity tuning of the readout circuitry ensured a reliable operation with respect to sensor fabrication variations and independent calibration of the sensor baseline for individuals. The on-chip voltage scaling allowed the further extension of the detection range and prevented the implementation of large on-chip elements. The on-lens system enabled the detection of capacitive variation caused by pressure changes in the range of 2.25 to 30 mmHg and hydration level variation from a distance of 1 cm using incident power from an RFID reader at 26.5 dBm.
URI: http://dx.doi.org/10.3390/s17010108
http://hdl.handle.net/11536/133047
ISSN: 1424-8220
DOI: 10.3390/s17010108
期刊: SENSORS
Volume: 17
Issue: 1
起始頁: 0
結束頁: 0
顯示於類別:期刊論文


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