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Villa-López, Farah Helue; Rughoobur, Girish; Thomas, Sanju; Flewitt, Andrew John; Cole, Marina; Gardner, Julian W (2015)
Publisher: Measurement Science and Technology
Languages: English
Types: Article
Subjects: TD, Air quality monitoring, finite element model, particle sensor, solidly mounted resonator
This work presents the design and fabrication of Solidly Mounted Resonator (SMR) devices for the detection of particulate matter (PM2.5 and PM10) in order to develop a smart low-cost particle sensor for air quality. These devices were designed to operate at a resonant frequency of either 870 MHz or 1.5 GHz, employing zinc oxide as the piezoelectric layer and an acoustic mirror made from molybdenum and silicon dioxide layers. Finite element analysis of the acoustic resonators was performed using COMSOL Multiphysics software in order to evaluate the frequency response of the devices and the performance of the acoustic mirror. The zinc oxide based acoustic resonators were fabricated on a silicon substrate using a five mask process. The mass sensitivity of the acoustic resonators was estimated using a 3-D finite element model and preliminary testing has been performed. The theoretical and observed mass sensitivity were similar at ca. 145 kHz/ng for the 870 MHz resonator when detecting PM2.5 suggesting that SMR devices have potential to be used as part of a miniature smart sensor system for airborne particle detection. This work was funded under the European Commission 7th Framework Programme, Project No. 611887, “Multi-Sensor-Platform for Smart Building Management: MSP”. F.H.Villa-Lopez thanks the financial support from the National Mexican Council of Science and Technology (CONACYT). G. Rughoobur wishes to acknowledge financial support from the Cambridge Trusts. This is the author accepted manuscript. The final version is available from IOP via http://dx.doi.org/10.1088/0957-0233/27/2/025101
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

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