The invention relates to a method and a device for quantitive determination of a number and size of particulate components contained in a medium flowing along a flow channel. Ultrasonic waves are coupled into the flowing medium, which are reflected at least partially by the particulate components and reflected ultrasonic wave portions which are detected in a ultrasonic time signals, on which the quantitive determination is based. Amplitude values associated with the individual ultrasonic time signals, are detected which are each greater than an amplitude threshold value established for each ultrasonic time signal: The detected amplitude values are assigned to values describing the size and the number of the particulate components.

A method for checking an ultrasound probe which includes taking a measurement using the probe bonded to the part and in comparing the results with a prerecorded reference recording, and, if there is divergence, in using a tool previously used to produce the reference recording to identify whether the probe is not bonded or not working properly. Such a checking method makes it possible to check the state of the probe without having to remove it.

The invention relates to a device for detecting faults of a structure (STR), the device comprising a calculation unit and a plurality of transducers (100) intended to be positioned on or in the structure (STR), first transducers (E) of the plurality de transducers (100) being capable of being in an emission mode, second transducers (R) of the plurality of transducers (100) being capable of being in a reception mode,
characterized in that the first transducers (E) form a hexagonal meshing so as to delimit between them several mutually adjacent mesh cells, the second transducers (R) being positioned on respective emission circles of the first transducers (E), each emission circle of a first transducer (E) being centered on the first transducer (E).

A dual probe assembly comprises dual transducers which are free to rotate over a desired range of roof angles required for different inspection applications. The roof angle for a particular application is defined by attaching the dual probe assembly to a wedge assembly having an upper contact surface which defines the roof angle of the transducers.

Systems and methods relate to testing and/or monitoring acoustic emissions detected at composite structures, such as carbon fiber structures, intended for use in extreme conditions, such as in high pressure conditions, high or low temperature conditions, conditions in which the composite structure is subjected to mechanical impacts, or the like. The systems and protocols are suitable for use with composite structures comprising, e.g., carbon fiber structures, such as hollow or partially hollow structures used in submersible vehicles, spacecraft, gas-fillable storage containers, pressure vessels, and the like, that are subjected to extreme conditions during use. Systems and methods disclosed herein are directed to collecting and analyzing data, determining background conditions, differentiating and classifying signals, conditioning or curing a material or structure, assessing, rating and/or validating the “health” of a material or structure in real-time, determining alarm conditions, predicting failure conditions, and the like.

A system of monitoring diffuse waves over a concrete beam under different loads. Ultrasound transmitters and receivers are placed over the concrete beam to emit sound waves and collect diffuse waves under different loads. The waveform variations are observed to quantify a decorrelation coefficient (DC) indicating global structural changes and crack position. An inversion of the correlations is applied to estimate distribution density at each localized position following the sensitivity kernel and inversion algorithms. Then, three-dimensional imaging comprised of density values at each localized position are generated to indicate number, position, and depth of multiple cracks.

A multi-feed detection device includes a transmission circuit substrate on which an ultrasonic transmitter transmitting an ultrasonic wave is installed, and an ultrasonic receiver receiving the ultrasonic wave. The ultrasonic transmitter transmits the ultrasonic wave in a direction intersecting a thickness direction of the transmission circuit substrate and at least one of the ultrasonic transmitter and the ultrasonic receiver has a plurality of ultrasonic elements.

A measurement system for determining a density ρ or a compressibility κ of a liquid medium in a vessel includes: at least one pressure sensor for measuring a hydrostatic pressure Δp of the liquid medium as a measured hydrostatic pressure Δp; at least one ultrasound sensor for measuring a first time of flight t.sub.1 along a first propagation path comprising a point at a level surface of the liquid medium, and for measuring a second time of flight t.sub.2 along a second propagation path, which is different from the first propagation path; and a control unit for determining the density ρ or the compressibility κ of the liquid medium based on the measured hydrostatic pressure Δp, the first time of flight t.sub.1, and the second time of flight t.sub.2.

Described are an apparatus, computer program product, and associated methods for shaped waveform acoustic interrogation of substances and materials to determine one or more properties of the materials or substances. In some embodiments, a shaped waveform is formed by summing two or more different waveforms and an acoustic wave is generated according to the shaped waveform. The acoustic wave is transmitted by one or more transmitting transducers through the substance or material and received by one or more receiving transducers. The shaped waveform acoustic wave can have a duration or a period that is less than about 20 μs and can comprise predetermined frequency content. Characteristics of the shaped waveform acoustic wave, as received at the receiving transducer(s), including characteristics such as amplitude, frequency, time of flight, etc., can be associated with said one or more properties of the substance or material to provide for real-time monitoring of these properties.

Acoustic transducers generate and receive acoustic signals at multiple locations along a surface of rigid structure, wherein longitudinal spacing between transducer locations define measurement zones. Acoustic signals with chosen amplitude-time-frequency characteristics excite multiple vibration modes in the structure within each zone. Small mechanical changes in inspection zones lead to scattering and attenuation of broadband acoustic signals, which are detectable as changes in received signal characteristics as part of a through-transmission technique. Additional use of short, narrowband pulse acoustic signals as part of a pulse-echo technique allows determination of the relative location of the mechanical change within each zone based on the differential delay profiles. For accurate acoustic modeling and simulation, the mesh size, time step, time delay, and time-window size are optimized. Frequency normalization of the Short-Time Fourier Transform of acoustic response output improves experiment-simulation cross-validation. Applications of the method to structures with arbitrarily complex geometries are also demonstrated.