Résumé
Viscoelastic properties of biological materials and food are of first interest on an academic point of view (internal structure evaluation) and on a practical point of view: link between rheological properties and macroscopic parameters such as moisture or fat content. Since many years we are working on high frequency ultrasonic approaches dedicated to food and biological materials investigation. We have already shown that investigations of complex reflection coefficients at an interface (elastic solid) / (viscoelastic material) can give accurate information on alpha-transition or glass transition around room temperature for a typical biological material and food: honey. In this new communication we propose to investigate how high frequency methods can give interesting information for Kramers-Kronig relationships application. In particular we will demonstrate that high frequency methods give an asymptotic behavior around glass transition which is fundamental for KramersKronig relationships application. Then using also low frequency behavior (classical rheology) it is possible to deduce G with G or G with G on a very large bandwith (few Hz to GHz) around room temperature. This allows the determination of the whole master curves when G or G are not measured properly. Examples will be given on honey.