Warren Grundfest,Maie St. John,Ashkan Maccabi,George Saddik,Zachary Taylor
申请号：
US16582084
公开号：
US20200085407A1
申请日:
2019.09.25
申请国别(地区):
US
年份:
2020
代理人:
摘要：
Systems and methods for performing multi-frequency harmonic acoustography for target identification and border detection are described, where a focused confocal transducer having a piezoelectric element and a hydrophone positioned centrally in the piezoelectric element is used. The transducer emits ultrasonic waves toward a target of interest at first and second frequencies. The two waves interfere at a focal plane within the target to generate a third acoustic wave. The target absorbs energy and emits its own unique vibration at the difference frequency (Δ；f) of the two waves as well as its harmonics. The unique vibration is recorded with a hydrophone, and mechanical properties of the target are ascertained through detection and analysis of the third acoustic wave using a mathematical model implemented by a signal processing circuit.
