UDC 538.951
SENSOR STRUCTURE ON THE BASIS OF PHONONIC CRYSTAL PLACED BETWEEN PIEZOELECTRIC TRANSDUСERS
N. V. Mukhin, Ph.D. (Tech.), associate professor, senior researcher, Department of Photonics, Saint Petersburg Electrotechnical University «LETI», St. Petersburg, Russia; senior researcher, Institute of Micro and Sensor Systems, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany; This email address is being protected from spambots. You need JavaScript enabled to view it.
М. М. Kutia, post-graduate student, Institute of Automation, Magdeburg University Otto von Guericke, Magdeburg, Germany; This email address is being protected from spambots. You need JavaScript enabled to view it.
E. S. Borodacheva, master degree student, Institute of Automation and Electronic Instrumentation, Kazan National Research Technical University named after A. N. Tupolev – KAI, Kazan, Russia; This email address is being protected from spambots. You need JavaScript enabled to view it.
The frequency properties of the phononic crystal based structure are studied theoretically and experimentally, and the possibilities of its application in acoustic sensors for detecting the volumetric properties of liquids are shown. The sensor structure is a two-dimensional periodic system of cylindrical-shaped holes in a steel matrix placed between two piezoelectric transducers. The resonant frequencies corresponding to the defect mode in the band gap of phononoic crystal, created by filling one of the cavities of a periodic structure with the analyzed liquid, were calculated and experimentally determined. Measurements of mixtures of water and propanol, gasoline and ethanol showed that the sensor has sufficient sensitivity to distinguish between mixtures. The aim of the work is a theoretical and experimental study of the formation of isolated defect
modes in a two-dimensional phononic crystal to create a fluid sound velocity sensor.
Key words: phononic crystal, piezoelectric transducer, sound velocity sensor.