The identification of the high strain-rate properties of materials is an important topic for many engineering applications such as crash worthiness, blast loading, industrial forming, among others. It is also a very challenging experimental task mainly because of the difficulty in measuring impact loads accurately in regimes where inertia effects are significant as well as in presence of heterogeneous deformation states. We present here an innovative identification strategy, using high power ultrasonic loadings together with both InfraRed Thermography, Ultra-High-Speed Imaging and grid method, able to simultaneously characterize the viscoelastic behaviour of polymer materials over a large loading spectrum. The main originalities lies in the fact that heterogeneous stress fields are experimentally reconstructed through acceleration fields measurement and that contrary to conventional DMA, no frequency or temperature sweep is required since the experiment is designed to simultaneously produce both a heterogeneous strain-rate state (up to 400 s-1) and a heterogeneous temperature state (up to the glassy transition point) allowing a local and “spectral” identification. Moreover, by cooling the sample down, the apparent strain-rate loading range can be significantly increased to fill the gap between servo-hydraulic (10 3 s-1) tests. The present work falls within an effort to invent new high-strain test methodologies based on full field imaging and inverse identification, to both overcome the limits of standard experimental strategies and take advantage of the deformation heterogeneities to achieve a full-characterization of a material from a “one-shot” test.