Acoustic impedance measuring apparatus using ultrasonic waves

An acoustic impedance measuring apparatus for emitting ultrasonic waves to a target measurement object and measuring an acoustic impedance of the target measurement object from ultrasonic waves fed back from the target measurement object, said acoustic impedance measuring apparatus comprising:

• an ultrasonic transducer;
• and
• a pulser circuit that generates a first rectangular pulse signal and a succeeding second rectangular pulse signal, which are to be applied to said ultrasonic transducer;
• wherein the first rectangular pulse signal and the second rectangular pulse signal have different voltages, and the first and second rectangular pulse signals cause vibration of the ultrasonic transducer so as to generate the ultrasonic waves emitted to the target measurement object.

An acoustic impedance measuring apparatus for emitting ultrasonic waves to a target measurement object and measuring an acoustic impedance of the target measurement object from ultrasonic waves fed back from the target measurement object, said acoustic impedance measuring apparatus comprising:

• an ultrasonic transducer;
• and
• a pulser circuit that generates a signal to be applied to said ultrasonic transducer;
• wherein the signal generated by the pulser circuit causes vibration of the ultrasonic transducer so as to generate the ultrasonic waves emitted to the target measurement object, and wherein a vibration caused by one part of the signal is cancelled by a vibration caused by another part of the signal to suppress the vibration of the ultrasonic transducer from continuing.