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Bias control used for capacitance micro-processing ultrasonic transducer

A capacitive micromachining, ultrasonic transducer technology, applied in the direction of the fluid using vibration

Active Publication Date: 2018-01-26
KOLO MEDICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the matching layer is usually selected based on the quarter-wavelength principle, the bandwidth of a PZT transducer with a matching layer can be limited to 80% or less of the bandwidth of

Method used

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  • Bias control used for capacitance micro-processing ultrasonic transducer
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  • Bias control used for capacitance micro-processing ultrasonic transducer

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Embodiment Construction

[0027] Some implementations herein include techniques and arrangements for selectively changing the vertical aperture size and / or apodization pattern for a CMUT, an element or subelement of a CMUT array, or other CMUT. For example, changes in aperture and / or apodization can be achieved by adjusting the bias voltage applied to selected regions of the CMUT. As an example, different bias voltages may be applied at different bias controllable regions in a CMUT, which enables the properties of the CMUT to vary individually in these different bias controllable regions. Accordingly, in some cases, the bias voltage can be adjusted to control the effective aperture size and / or apodization pattern of the CMUT. Furthermore, in some implementations, the bias voltage can be varied over time such that the effective aperture size and / or apodization pattern of the CMUT can be correspondingly varied over time. This change may be continuous or discrete, such as a change comprising multiple ste...

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Abstract

Bias control used for capacitance micro-processing ultrasonic transducer. In some embodiments, CMUT may include a plurality of electrodes, each electrode may include a plurality of sub-electrodes; e.g. a first sub-electrode and a second sub-electrode are disposed on opposite sides of a third sub-electrode; in some embodiments, first bias voltage can be applied to the third sub-electrode and secondbias voltage can be applied to the first and second sub-electrodes, so that at least one of the first, second and third sub-electrodes can emit and / or receive supersonic energy; e.g. second bias voltage can be applied at the different voltage value from the first bias voltage, and / or that applied at different timing sequence being different from the first bias voltage.

Description

technical field [0001] Some examples herein relate to capacitive micromachined ultrasound transducers (CMUTs), such as may be used for ultrasound imaging. Background technique [0002] Ultrasound transducers are widely used in many different fields, including ultrasound imaging. In conventional modern medical imaging applications, ultrasound transducers are often constructed of piezoelectric materials. One commonly used piezoelectric material is lead zirconate titanate (PZT). However, the impedance of PZT is generally higher than 30 MRayle, while the impedance of human tissue is about 1.5 MRayle. To reduce this large impedance mismatch, one or more matching layers can be placed between the PZT transducer and the tissue being imaged. Since the matching layer is usually selected based on the quarter-wave principle, the bandwidth of a PZT transducer with a matching layer can be limited to 80% or less of the bandwidth. [0003] Capacitive micromachined ultrasound transducers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/06
CPCB06B1/0207B06B1/0292G01S15/8927
Inventor D·赵Y·黄庄雪锋
Owner KOLO MEDICAL