10 COMSOL MULTIPHYSICS OCTOBER 2018 THE BRAINS OF BANKNOTE PROCESSING SYSTEMS Engineers and physicists at Giesecke+Devrient Currency Technology are using multiphysics simulation to develop magnetic, optical, and ultrasonic sensors for high-performance modular banknote processing systems that can securely sort and process millions of banknotes every day. THE PHRASE “CASH IS KING” may reverberate with many of us, but not nearly as much as it does with professional cash centers that process and handle millions of banknotes every day. There is more cash in circulation today than ever before, and this surge in volume, coupled with the growing variety in banknote security features and increasing complexity in banknote design, has drastically raised the requirements for automated ca

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