A self-reciprocity calibration method for broadband focused transducers.

Area of Science:

• Ultrasonic transducer calibration
• Acoustic metrology
• Non-destructive testing

Background:

• Accurate characterization of ultrasonic transducers is crucial for reliable measurements.
• Traditional calibration methods can be complex, requiring multiple components and precise alignment.
• Broadband and spherically focused transducers present unique calibration challenges.

Purpose of the Study:

• To develop a simplified self-calibration procedure for broadband, spherically focused ultrasonic transducers.
• To utilize the principle of reciprocity for transducer characterization.
• To validate the proposed method's robustness and potential for practical application.

Main Methods:

• A pulse-echo configuration was employed to measure input and received signals.
• A multi-Gaussian beam model was integrated with measured signals.
• The electromechanical transfer function of the transducer was derived from these data.

Main Results:

• The self-calibration procedure successfully determined the transducer's electromechanical transfer function.
• Experimental results demonstrated that the transfer function is insensitive to the on-axis placement of the reflector.
• The method reduces the experimental setup to a single transducer and a reflector.

Conclusions:

• The developed reciprocity-based self-calibration procedure is effective for broadband, spherically focused ultrasonic transducers.
• The insensitivity to reflector placement supports the integration of this method into practical testing scenarios.
• This simplified approach enhances the efficiency and feasibility of transducer calibration.