摘要:
Micromachined ultrasonic transducers formed in complementary metal oxide semiconductor (CMOS) wafers are described, as are methods of fabricating such devices. A metallization layer of a CMOS wafer may be removed by sacrificial release to create a cavity of an ultrasonic transducer. Remaining layers may form a membrane of the ultrasonic transducer.
摘要:
An ultrasonic transducer that can include a driver side and a bias voltage side. A higher voltage source can be electrically connected to the bias voltage side through a first resistor. A lower voltage source can be electrically connected to the driver side of through a second resistor. A field effect transistor or other suitable switch can be included, having a source, a gate and a drain. The source can be electrically connected to ground and the gate can be electrically connected to a control signal source. The drain can be electrically connected to the lower voltage source through a second resistor and be electrically connected to the driver side of the ultrasonic transducer. The gate can be electrically connected to a signal source through a third resistor.
摘要:
A signal generator generates an electrical signal that is sent to an amplifier, which increases the power of the signal using power from a power source. The amplified signal is fed to a sender transducer to generate ultrasonic waves that can be focused and sent to a receiver. The receiver transducer converts the ultrasonic waves back into electrical energy and stores it in an energy storage device, such as a battery, or uses the electrical energy to power a device. In this way, a device can be remotely charged or powered without having to be tethered to an electrical outlet.
摘要:
A visual indicator is incorporated into an ultrasonic emitter/sound system for ultrasonic carrier audio applications. The visual indicator can be utilized to ensure that an orientation of the ultrasonic emitter is appropriate relative to a position of an intended target of the audio modulated ultrasonic carrier signal, or that a listener is appropriately located relative to the ultrasonic emitter such that it can receive a targeted audio transmission.
摘要:
An electromechanical transducer according to an embodiment of the present invention is capable of selectively performing a transmitting and receiving operation by using elements of different shapes. The electromechanical transducer has a plurality of cells, each of which has a vibrating film including two electrodes provided with a gap therebetween, two driving and detecting units, a potential difference setter, and a switch. Each of the driving and detecting units implements a transmitting and/or a receiving function. A first or second element includes first or second electrodes which are electrically connected and further connected to the common first or second driving and detecting unit, respectively. The potential difference setter sets a predetermined potential difference between the reference potentials of the first and second driving and detecting units, respectively, and the switch switches between the first and second driving and detecting units to perform the transmitting and receiving operation.
摘要:
An electromechanical transducer according to an embodiment of the present invention is capable of selectively performing a transmitting and receiving operation by using elements of different shapes. The electromechanical transducer has a plurality of cells, each of which has a vibrating film including two electrodes provided with a gap therebetween, two driving and detecting units, a potential difference setter, and a switch. Each of the driving and detecting units implements a transmitting and/or a receiving function. A first or second element includes first or second electrodes which are electrically connected and further connected to the common first or second driving and detecting unit, respectively. The potential difference setter sets a predetermined potential difference between the reference potentials of the first and second driving and detecting units, respectively, and the switch switches between the first and second driving and detecting units to perform the transmitting and receiving operation.
摘要:
The invention provides a portable ultrasonic imaging probe directly connectable to an off-the-shelf laptop computer. The probe produces raw digitized data comprising envelope detected ultrasound echo data from an array of ultrasound transducers, and transmits the data to the host computer thereby enabling the host computer to form real-time ultrasonic images of human tissue without the need for any additional electronics. In particular embodiments, the probe includes a plurality of transmit switches configured to connect a transmitting group of the ultrasound transducers to a pulser; a plurality of receive switches configured to connect a receiving group of the ultrasound transducers to analog summing, amplification and signal processing circuitry; and a transmit/receive controller which selects which of said ultrasound transducers are in the transmitting group and which of said ultrasound transducers are in the receiving group. The ultrasound transducers may be conventional or micromachined ultrasound transducers.
摘要:
An ultrasonic probe 10 is formed by arranging a plurality of transducers 26a to 26m for converting drive signals into ultrasonic waves to transmit the waves to an object to be inspected, and receiving ultrasonic waves generated from the object to convert the waves into electrical signals. Each of the transducers 26a to 26m has a plurality of oscillation elements 34-1 to 34-30, and each of the oscillation elements 34-1 to 34-30 has a characteristic in which the electromechanical coupling coefficient changes in accordance with the strength of the direct-current bias applied by being superposed on the drive signals. Electrodes 35, 36, and 37 of each of the oscillation elements 34-1 to 34-30 are connected to terminals 49-1 and 49-2 to which the drive signals are applied.
摘要:
A method and system for controlling bias voltage for use with an electrostatic transducer are provided. The bias voltage is dynamically varied or set as a function of imaging mode, depth gain compensation, elevational apodization, azimuthal apodization, timing with respect to the transmit waveform, center frequency of transmit and receive waves and desired modulation. Opposite polarity on sub-elements is also provided for removing signals from electromagnetic interference and crosstalk between elements.
摘要:
A method and system for generating transmit pulses for use with an electrostatic transducer in harmonic imaging are provided. The excitation waveforms are pre-distorted to account for the non-linear output of the electrostatic transducer. Additionally, the force on a multiple element electrostatic transducer array is measured. A bias voltage is applied to the electrostatic transducer where the bias voltage is responsive to the measured force.