A Novel Transfer Function Based Ring-Down Suppression System for PMUTs.

Area of Science:

• * MEMS and Ultrasonic Transducer Technology
• * Signal Processing and Control Systems

Background:

• * Piezoelectric Micromachined Ultrasonic Transducers (PMUTs) are crucial for various applications.
• * Ring-down effects and blind areas limit PMUT performance and operational range.
• * Existing methods for ring-down suppression often compromise transducer efficiency.

Purpose of the Study:

• * To introduce a novel ring-down suppression system for PMUTs.
• * To reduce the ring-down time and blind area of PMUTs without performance degradation.
• * To establish a practical design guideline for low ring-down PMUT systems.

Main Methods:

• * Development of a transfer function-based suppression system.
• * Integration of a virtual PMUT model with a Proportional (P) controller.
• * Experimental optimization of the P controller for a 115-kHz PMUT array.
• * Establishment of a system design guideline for industrial application.

Main Results:

• * Achieved up to a 93% reduction in ring-down time for a 115-kHz PMUT array.
• * Reduced the blind area of the PMUT array by approximately 40%.
• * Demonstrated that the system does not degrade other PMUT performances.
• * Developed a practical and straightforward design guideline for industrial scenarios.

Conclusions:

• * The proposed transfer function-based system effectively suppresses ring-down and reduces the blind area in PMUTs.
• * The system offers a practical solution for enhancing PMUT performance with easy ASIC integration.
• * The findings provide a valuable guideline for developing next-generation PMUT devices.