H-bridge pulse generator

A transmitting switching circuit for electromagnetic acoustic transducers (EMATS) with a coil without a transformer, said circuit comprising

• driving means for driving the EMAT without a transformer
• first and second means for, respectively, selectively redirecting current to the EMAT coil and selectively starting and ending current flow, said second means being operatively connected to said means
• wherein said circuit can produce a rectangular window tone burst which is achieved by turning on and off four switches which are optical drivers
• and wherein there are twice the number of switches in a parallel circuit.

An improved electronic pulser circuit based on H-bridge topology for driving inductive coils such as the transmitter coil of an electromagnetic acoustic transducer (EMAT) so as to provide extended performance in terms of increased power output, stability, reduced noise and generation of complex output wave forms, said circuit including a

• diode inserted in series with the switching device which comprises
• a transmitting switching circuit for an electromagnet acoustic transducer (EMAT) comprising
• means for driving the EMAT without a transformer at the desired high frequencies
• a first means for selectively redirecting the electrical current, connected to the EMAT coil,
• a second means for selectively starting current flow and ending current flow, connected by the first means,
• to prevent the flow of current in a direction that is in opposite polarity to the source voltage.