ULTRASONIC SURVEILLANCE SYSTEM FOR CONTAINER SEALS USING INDEPENDENT TERMINALS

摘要

System for monitoring containers with ultrasonic seals. According to the invention the seal is duplicated and comprises a transmitting transducer and a receiving transducer. The exciting signal is a voltage step applied to the transmitting transducer and the circuit able to supply said step is directly connected to the transmitting transducer without a connecting cable. Application to the monitoring of containers containing dangerous products, precious materials, documents, etc.