TY - JOUR T1 - A numerical method to derive accurate temperature coefficients of material constants from high-temperature SAW measurements: application to langasite. AU - Nicolay,Pascal, AU - Aubert,Thierry, PY - 2013/10/2/entrez PY - 2013/10/2/pubmed PY - 2013/10/2/medline SP - 2137 EP - 41 JF - IEEE transactions on ultrasonics, ferroelectrics, and frequency control JO - IEEE Trans Ultrason Ferroelectr Freq Control VL - 60 IS - 10 N2 - The design of wireless SAW sensors for high-temperature applications requires accurate knowledge of the constitutive materials' physical properties in the desired temperature range. In particular, it is crucial to use reliable temperature coefficients of the stiffness, piezoelectric, dielectric, and expansion constants of the propagation medium to achieve correct simulations of the considered devices. Currently, the best-suited piezoelectric material for high-temperature SAW applications is langasite (LGS). Unfortunately, the available coefficients do not allow for precise prediction of the temperature dependence of LGS-based SAW devices above 300°C. A novel method, based on a simulated annealing algorithm coupled with a Rayleigh wave simulation program, was developed to find optimal LGS temperature coefficients. This approach has proven to yield accurate results up to at least 800°C. SN - 1525-8955 UR - https://www.unboundmedicine.com/medline/citation/24081262/A_numerical_method_to_derive_accurate_temperature_coefficients_of_material_constants_from_high_temperature_SAW_measurements:_application_to_langasite_ L2 - https://dx.doi.org/10.1109/TUFFC.2013.2804 DB - PRIME DP - Unbound Medicine ER -