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Sensors 2017, 17(7), 1635;

Passive Downhole Pressure Sensor Based on Surface Acoustic Wave Technology

Mechanical Engineering Department, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453-900 Rio de Janeiro, Brazil
Author to whom correspondence should be addressed.
Received: 20 June 2017 / Revised: 12 July 2017 / Accepted: 13 July 2017 / Published: 15 July 2017
(This article belongs to the Special Issue Surface Acoustic Wave and Bulk Acoustic Wave Sensors)
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A passive surface acoustic wave (SAW) pressure sensor was developed for real-time pressure monitoring in downhole application. The passive pressure sensor consists of a SAW resonator, which is attached to a circular metal diaphragm used as a pressure transducer. While the membrane deflects as a function of pressure applied, the frequency response changes due to the variation of the SAW propagation parameters. The sensitivity and linearity of the SAW pressure sensor were measured to be 8.3 kHz/bar and 0.999, respectively. The experimental results were validated with a hybrid analytical–numerical analysis. The good results combined with the robust design and packaging for harsh environment demonstrated it to be a promising sensor for industrial applications. View Full-Text
Keywords: pressure sensor; downhole application; SAW device; wireless sensor pressure sensor; downhole application; SAW device; wireless sensor

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Quintero, S.M.M.; Figueiredo, S.W.O.; Takahashi, V.L.; Llerena, R.A.W.; Braga, A.M.B. Passive Downhole Pressure Sensor Based on Surface Acoustic Wave Technology. Sensors 2017, 17, 1635.

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