Transducer operational selection for ultrasonic analysis - utilises shift registers presenting three state logic signal to select columns and rows

摘要

The ultrasonic analysis system has the transducers arranged in columns and rows. Shift registers select the columns and rows to determine beam pattern by presenting three state logic signal. The third state is used to limit the opening to reduce noise. Transducers arranged in rows and columns comprise a material with polarisation properties which respond to three logic states provided by logic gates via amplifiers. These gates are connected to registers driven from a programmer which determines in which state the transducers are set. In the logic zero state only a certain number of lines are operated to reduce noise.