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- W2007404450 abstract "This work presents a microfabricated fringe-field capacitive pH sensor using interdigitated electrodes and an integrated modulation-based readout circuit. The changes in capacitance of the sensor result from the permittivity changes due to pH variations and are converted to frequency shifts using a crossed-coupled voltage controlled oscillator readout circuit. The shift in resonant frequency of the readout circuit is 30.96 MHz for a change in pH of 1.0–5.0. The sensor can be used for the measurement of low pH levels, such as gastric acid, and can be integrated with electronic pills. The measurement results show high repeatability, low noise, and a stable output." @default.
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- W2007404450 date "2014-06-02" @default.
- W2007404450 modified "2023-10-17" @default.
- W2007404450 title "A microfabricated fringing field capacitive pH sensor with an integrated readout circuit" @default.
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- W2007404450 doi "https://doi.org/10.1063/1.4881263" @default.
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