A sensor for obtaining downhole data includes a first piezoelectric layer. The sensor also includes a second piezoelectric layer having a trench extending a depth below a surface of the second piezoelectric layer. The sensor also includes an electrode positioned within the trench. The first piezoelectric layer is directly coupled to the second piezoelectric layer.

A method and device for characterizing the response of resonant sensors. The method is based on an analytic algorithm that establishes a relationship between the complex admittance G of the sensor, measured at a single test frequency, the variations in resonance frequency and the losses, such as the quality factor at the acoustic resonator. The device includes at least one piezoelectric resonator on whose surface is deposited a thin layer of material, a fluid medium in contact therewith, a stable signal source, a frequency synthesis subsystem, a multiplex subsystem that enables the excitation/interrogation of a particular resonator, a signal conditioning and acquisition subsystem, a control subsystem based on the use of digital integrated circuits enabling the coordinated control of the different subsystems that make up the device.

A system and method for measuring a sludge moisture content by ultrasound are provided, which relate to the technical field of sludge detection. The system includes: a measuring container, configured to load sludge; a pulse signal generator, configured to generate a pulse signal; a self-transmitting self-receiving (STSR) transducer, disposed on an outer wall of the measuring container, and configured to transmit a first ultrasonic signal into the measuring container under an excitation of the pulse signal and receive a second ultrasonic signal reflected from an inner wall of the measuring container; and an upper computer, configured to build a first mathematical model among a reflection coefficient, sludge acoustic impedance, and wall acoustic impedance of the measuring container, and build a second mathematical model between the sludge acoustic impedance and the sludge moisture content.

A system and method for measuring a sludge moisture content by ultrasound are provided, which relate to the technical field of sludge detection. The system includes: a measuring container, configured to load sludge; a pulse signal generator, configured to generate a pulse signal; a self-transmitting self-receiving (STSR) transducer, disposed on an outer wall of the measuring container, and configured to transmit a first ultrasonic signal into the measuring container under an excitation of the pulse signal and receive a second ultrasonic signal reflected from an inner wall of the measuring container; and an upper computer, configured to build a first mathematical model among a reflection coefficient, sludge acoustic impedance, and wall acoustic impedance of the measuring container, and build a second mathematical model between the sludge acoustic impedance and the sludge moisture content.

Embodiments of the present invention provide systems and methods for tagging and acoustically characterizing containers.

Embodiments of the present invention provide systems and methods for tagging and acoustically characterizing containers.

Method for determining a sound field in an enclosed space or at a target position within the enclosed space, the method has the following steps: performing an acoustic measurement at at least one measurement position within the enclosed space or at a single one measurement position within the enclosed space to obtain an interim value set; estimating a surface impedance as first parameter describing the enclosed space based on the interim value set; determining a model of the enclosed space based on the first parameter; and estimating a sound field throughout the enclosed space based on the model of the enclosed space, the sound field describing a sound characteristic for a plurality of positions within the enclosed space.

Method for determining a sound field in an enclosed space or at a target position within the enclosed space, the method has the following steps: performing an acoustic measurement at at least one measurement position within the enclosed space or at a single one measurement position within the enclosed space to obtain an interim value set; estimating a surface impedance as first parameter describing the enclosed space based on the interim value set; determining a model of the enclosed space based on the first parameter; and estimating a sound field throughout the enclosed space based on the model of the enclosed space, the sound field describing a sound characteristic for a plurality of positions within the enclosed space.

The invention relates to an apparatus for processing and analyzing a measurement fluid for measurement in a measurement device, comprising a fluid chamber which is filled by the measurement fluid or through which the measurement fluid flows during operation, an electrically driven ultrasound driver which causes the measurement fluid to vibrate during operation by applying an electrical operating voltage, wherein the measurement fluid, the ultrasound driver, a reflector as applicable and additional layers as applicable are parts of a resonator and of a common mechanical vibration system during operation.

An integrated system for determining a hemostasis and oxygen transport parameter of a blood sample, such as blood, is disclosed. The system includes a measurement system, such as an ultrasonic sensor, configured to determine data characterizing the blood sample. For example, the data could be displacement of the blood sample in response to ultrasonic pulses. An integrated aspect of the system may be a common sensor, sample portion or data for fast and efficient determination of both parameters. The parameters can also be used to correct or improve measured parameters. For example, physiological adjustments may be applied to the hemostatic parameters using a HCT measurement. Also, physical adjustments may be applied, such as through calibration using a speed or attenuation of the sound pulse through or by the blood sample. These parameters may be displayed on a GUI to guide treatment.