Abstract: Disclosed is a method for detecting a fluid, including at least one step of: measuring by at least one sensor of a wave propagating in an environment of the wave, in order to obtain at least one measured signal, the wave being particularly a mechanical wave; splitting the measured signal over a plurality of split time intervals with a predefined duration in order to obtain samples of the measured signal; computing the temporal coherence of the samples; and determination of the presence of the fluid using the computed temporal coherence.

Abstract: Aspects of the subject technology relate to systems, methods, and computer-readable media for machine learning analysis of low-frequency signal data in fracturing operations. The present technology can receive strain data associated with a monitoring well that is proximate to a treatment well. The strain data can comprise information representing a fracturing operation associated with the treatment well. Further, the present technology can convert the strain data into image data where a color scale corresponds to a degree of strain observed by a fiber optic cable deployed in the monitoring well. As follows, the present technology can provide the image data to a machine-learning model, which is configured to identify one or more features in the image data.

Abstract: In one example in accordance with the present disclosure, an imaging device is described. The imaging device includes an array of transducers. Each transducer includes an array of piezoelectric elements. Each piezoelectric element transmits pressure waves towards an object to be imaged and receives reflections of the pressure waves off the object to be imaged. The imaging device also includes a transmit channel per one or more piezoelectric elements to generate the pressure waves and a receive channel per one or more piezoelectric elements to process the reflections of the pressure waves. The number of channels are selectively altered to control parameters such as power consumption and temperature.

Abstract: The present disclosure relates to a calculation method, a storage medium and a device for a seabed reflection coefficient of point source elastic wave. The method includes initializing a calculation accuracy and a calculation range of the seabed reflection coefficient; discretizing a parameter space and obtaining the seabed reflection coefficient of point source elastic wave; combining an equivalent equation and a traditional calculation equation for the seabed reflection coefficient of point source elastic wave; solving an undetermined coefficient of the equivalent equation; obtaining a concise expression for the seabed reflection coefficient of point source under an accuracy in the first step; calculating the seabed reflection coefficient of point source elastic wave within a given calculation accuracy range using an obtained expression.

Abstract: In an information management system according to the present invention, a measuring device including an output means including an oscillation device capable of generating ultrasonic waves causes the oscillation device to generate ultrasonic waves including identification information enabling the measuring device to be identified. An information terminal including a microphone capable of detecting the ultrasonic waves acquires the identification information from the ultrasonic waves via the microphone. The information terminal is caused to display the measuring device for which the identification information has been acquired. In a case where the information terminal receives an input indicating that the displayed measuring device is to be device-registered, the measuring device is device-registered on the information terminal.

Abstract: A method and a ventilation system includes ventilation ducts, a control system and at least one spray nozzle. The at least one spray nozzle is configured to spray a liquid mist onto at least one portion of an inner surface of the ventilation system. The liquid mist contains a culture of microorganisms adapted for biologically treating fat, oil and grease present on at least one portion of the inner surface of the ventilation system, thereby providing for partial biodegradation of the fat, oil and grease present on the at least one portion of the inner surfaces of the ventilation system.

Abstract: An acoustic analysis system includes an acoustic sensor array that receives acoustic signals from a target scene and outputs acoustic data based on the received acoustic signals. A processor receives a plurality of acoustic data sets from the acoustic sensor array, representative of the target scene at different points in time. The processor determines one or more locations within the target scene represented by the plurality of acoustic data sets, each being a location of an acoustic signal emitted from the target scene. For each acoustic signal, the processor classifies the acoustic signal as an intermittent acoustic signal or a continuous acoustic signal, generates accumulated-time acoustic image data based on the plurality of acoustic data sets, and generates an accumulated-time display image for presentation on a display.

Abstract: This disclosure relates to the technical field of exploration geophysics, in particular to a method, a device, and a computer device for decoupling anisotropic elastic wave. The method includes: determining a set of Thomsen parameters included in an anisotropic model based on a received to-be-decomposed wave field decomposition request; transforming the set of Thomsen parameters to obtain a set of initial elastic parameters; performing S-wave and P-wave velocities separation processing for the set of initial elastic parameters to obtain a set of target P-wave elastic parameters and a set of target S-wave elastic parameters; and substituting those into the anisotropic model to process the to-be-decomposed wave field and obtain a target P-wave matrix and a target S-wave matrix. The process of decomposing S-wave and P-wave fields is simplified and the calculation cost is reduced according to the embodiments of this disclosure.

Abstract: The invention provides a signal processing system, for transferring analog signals from a probe to a remote processing unit. The system comprises a first ASIC at a probe, which is adapted to receive an analog probe signal. The first ASIC comprises an asynchronous sigma-delta modulator, wherein the asynchronous sigma-delta modulator is adapted to: receive the analog probe signal; and output a binary bit-stream. The system further comprises a second ASIC at the remote processing unit, adapted to receive the binary bit-stream. The asynchronous may further include a time gain function circuit, the first ASIC may further comprise a multiplexer, the second ASIC may further comprise a time-to-digital converter. The time to digital converter may be a pipelined time-to-digital converter.

Abstract: A method for providing an estimate of a time-of-flight between an ultrasonic signal emitted by a device and an ultrasonic echo signal returned by a target object hit by the ultrasonic signal and received at the device.

Abstract: An acoustic location determination system is disclosed. The system includes one or more transmitting devices and one or more mobile devices. The transmitting device includes a first transducer configured to transmit first acoustic signals having a first frequency, and a second transducer configured to transmit second acoustic signals having a second frequency. The transmitting device further includes a beacon device configured to transmit beacon data via a short-range wireless communication technique. The transmitting device further includes one or more control devices configured to select the first or second acoustic signals based at least in part on one or more operating capabilities of one or more mobile units associated with the real-time locating system. The one or more control devices are further configured to cause transmission of the selected acoustic signals and the beacon data.

Abstract: A method of distributing data to a transducer array of an ultrasonic device, the transducer array including transduction elements arranged in module units, includes generating a data packet using an optical transceiver controlled by a controller, the data packet including activation instructions encoded in a first wavelength, transmitting the data packet from the controller to a target device via a signal in an optical fiber, the target device having a beam divider device, splitting the data signal, using the beam divider device, into a plurality of data streams, where each of the data streams carries the data packet in an identical phase, transmitting the data streams to the module units, and activating the transduction elements based on the received data streams.

Abstract: A surgical positioning system includes an emitter secured to a medical implant; at least three microphones; at least one processor; and a memory. The emitter has a speaker and a power source. The memory stores instructions for execution by the processor that, when executed, cause the processor to receive, from each of the at least three microphones, information about a detected sound; and calculate, based on position information corresponding to each of the at least three microphones and the received information, a position of the implant.

Abstract: The invention herein disclosed is a non-lethal crowd-control system that uses ultrasonic sound waves to induce disarming sensations of tickling/tingling upon persons in a hostile/violent crowd who are located within a zone of desired crowd control. The sensations can cause persons to cease current behavior and attempt to eliminate the sensations. Moving backwards out of the areal zone of control will reduce or eliminate the sensations. As a result a control zone area is established without use of batons, sprays or rubber-bullet loaded weaponry.

Abstract: A method for automatically identifying an active source azimuth of a planet seismometer, comprising: intercepting a three-channel original time sequence in a duration before and after an active source first arrival signal of each support leg received by a planet seismometer in turn; converting the three-channel original time sequence to a horizontal plane based on a pitch angle and a roll angle of the planet seismometer after being deployed to a surface of a planet; converting a time sequence of the horizontal plane to RTZ coordinates and calculating the maximum amplitudes of components of a vibration signal; constructing a target function based on the maximum amplitudes of components of a vibration signal, and scanning an azimuth of the planet seismometer at preset angle intervals, wherein when the target function reaches the minimum, the corresponding azimuth of the planet seismometer is the optimal estimation.

Abstract: Disclosed are a multi-scale photoacoustic detection method of geological structure around a borehole and related devices. The method includes: obtaining depth information and direction information of the borehole; generating trajectory data of the borehole according to the depth information and direction information; obtaining an optical image of the geological structure around the borehole; generating a first velocity model according to the optical image and the trajectory data; obtaining low-frequency acoustic wave data and high-frequency acoustic wave data of the geological structure around the borehole; performing a full waveform inversion on the first velocity model according to the low-frequency acoustic wave data and the high-frequency acoustic wave data to obtain a second velocity model; and determining the geological structure around the borehole according to the second velocity model.

Abstract: A linear transducer is connected to a first flexible member that has a first elongated shape with a first minor axis and a first major axis perpendicular to each other. This connects the linear transducer to opposite portions of the first flexible member along the first major axis. A second flexible member having an elongated shape with a second minor axis and a second major axis is provided. The second flexible member is connected to the first flexible member such that portions on the second major axis are joined to move with portions of the first flexible member on the first minor axis. Operation of the linear transducer multiplies displacements of the second flexible member relative to those of the transducer.

Abstract: Various examples are provided for systems and methods for geodesy in shallow water. In one example, a method includes obtaining, from a sensor module, a position of a superstructure of a moored device. At least one measurement corresponding to a heading, a pitch, or a roll of the superstructure can be obtained from the sensor module. An estimated position of an anchor, ballast, or other seafloor marker of the moored device can be determined based on the position of the superstructure and at least one corrected heading associated with the at least one measurement. The at least one corrected heading can be determined by applying a magnetic declination correction to the at least one measurement.

Abstract: A receiving apparatus includes: M receivers configured to receive signals based on sound waves propagating in water; M FIR filters configured to perform waveform operation on the signals received by the receivers; a combiner configured to combine output signals of the M FIR filters; and a filter coefficient calculation portion configured to calculate a tap coefficient of the M FIR filters so as to reduce an error of the output signals combined by the combiner. The M FIR filters have a tap length that is shorter than a delay spread that is a possible range between a time of arrival of a direct wave and a time of arrival of a delayed wave of the sound waves.

Abstract: Various approaches for focusing an ultrasound transducer include introducing at least one transient acoustic reflector located in proximity to at least one target region; generating multiple sonications to the at least one target region; measuring a reflection signal of each of the sonications off the at least one transient acoustic reflector; selecting the measured reflection signals, and based at least in part on the selected reflection signals, adjusting a parameter value associated with at least one of the transducer elements so as to improve an ultrasound focus at the target region.