Bernhard E. Boser,David A. Horsley,Hao-Yen Tang,Yipeng Lu
申请号：
US15065621
公开号：
US20160262725A1
申请日:
2016.03.09
申请国别(地区):
US
年份:
2016
代理人:
摘要：
An ultrasonic imaging apparatus having a Micro-machined Ultrasonic Transducer (MUT), such as a Piezoelectric MUT (PMUT) or Capacitive MUT (CMUT), with a transmitting mode and a receiving mode for generating and sensing acoustic pressure in imaging applications. During transmission in a PMUT the inverse piezoelectric effect on the piezo layer causes transverse stress, which causes a bending moment in the PMUT structure leading to out-of-plane deflection. Different applied signs of voltage generates different signs of stress inside the piezo that in turn cause oscillating motion generating an acoustic pressure wave. During signal reception, incident pressure waves deflect the PMUT creating transverse stress, resulting in a charge determined through measuring voltage between electrodes. The apparatus is particularly well-suited for use in health care, such as measuring fat/muscle thickness, blood-flow, and blood pressure.
