Digital Phase Detection for High-Precision Surface Acoustic Wave Sensor Systems

Guopeng Hu, Hao Ying, Xinyu Du, Jianzeng Xu, Joseph Smolinski, Gregory Auner

Abstract:	We are developing a highly sensitive surface acoustic wave (SAW) sensor system for biomedical and industrial applications. One of the key components of such a system is the signal read-out unit based on digital phase detection, which is needed to quantitatively determine tiny mass change on the sensor. To find a method that produces the highest precision, we have compared several digital phase detection methods (fast-Fourier transform, zero-crossing and sine-wave fitting) and found the zero-crossing method to be the most promising one. Using this method, a phase detection limit of 0.03° has been achieved on an AlN/sapphire SAW sensor operating at 255.05MHz. And the minimum phase detection limit of our system could reach 0.01° at the same frequency.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	202 - 206
Cite this article:	Hu, Guopeng, Ying, Hao, Du, Xinyu, Xu, Jianzeng, Smolinski, Joseph, Auner, Gregory, "Digital Phase Detection for High-Precision Surface Acoustic Wave Sensor Systems," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 202-206.
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