Optimization of memristor based ultrasonic transducers for mesoscopic characterization of biomaterials

A nonlinear time reversal ultrasonic (US) imaging set-up coupled with memristors was used to define the concept of memosducer in order to measure locally the characterization and aging of the skin. Each memosducer consists of a ultrasonic transducer (Panametrics 2.5 MHz) with an internal electrical impedance modified by an array of BS-AF-W discrete self-directed-channel bipolar devices commercialized in 8-pin ceramics DIP packages by Knowm Inc. In order to control/program the optimized distribution of set/reset inputs applied to the Knowm Inc. memristors, a amplitude modulated chirp-coded excitation is applied to the memosducer. The typical test equipment consists of a preamplifier Juvitek TRA-02 (0.02-5MHz) connected to a computer, an VBA100-110 Acquitek amplifier, a shear wave transducer Technisonic (2.25MHz), and a longitudinal wave transducer Panametrics V155 (5MHz). Packaged chips are presented with 8 discrete memristors in 16 Pin Ceramic DIP (Dual Inline Package) with wafer batch (DM8-16DIP-BS-AF1403272-9 226,DM8-I6DIP-BSAF 1403272-9230 Tier 3, Knowm Inc, Santa Fe, USA). The experimental set-up constitutes a basis of a reservoir computing system for US nonlinear imaging of mesoscopi properties of biomaterials.