15 April 2016 Design of an electronic oscillator for resonant pressure sensor with non-collocated sensor and actuator
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Abstract
This paper presents a simple closed loop circuit (oscillator) design for producing sustained, oscillations required to continuously vibrate the resonance based pressure sensor at its resonant frequency. For each variation in applied input pressure, the sensor’s resonant frequency varies and the circuit makes the sensor to vibrate at its new resonant frequency, thereby enabling the measurement of change in resonant frequency shift due to corresponding pressure. The resonant condition is achieved by automatic tuning of phase angle required to satisfy Barkhausen criteria. The proposed circuit is evaluated analytically and verified experimentally for different pressure sensors fabricated using various grades of Stainless Steel material.
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Akila Ravindran, Uma Gandhi, Suresh Kaluvan, Seung-Bok Choi, Mangalanathan Umapathy, "Design of an electronic oscillator for resonant pressure sensor with non-collocated sensor and actuator", Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97990U (15 April 2016); doi: 10.1117/12.2218952; https://doi.org/10.1117/12.2218952
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