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Estimation of Characteristics of an Ultrasonic Piezoelectric Transducer with Voltage Transfer Gain

For estimation of the system-independent characteristics of an ultrasonic piezoelectric transducer in a pulse echo system, voltage transfer gain (VTG) is introduced, which is related to the transfer function between the input voltage of the transmitting transducer and the open circuit output voltage of the receiving transducer. As the VTG represents the frequency characteristics of a transducer itself, the impulse response of a transducer can be easily calculated from the VTG characteristics with the inverse Fourier transformation. Absolute sensitivities of a transducer can also be calculated from both its VTG and input impedance. A typical design example of a 2.5 MHz transducer is discussed through the VTG method.