An ultrasonic inspection method that includes arranging an ultrasonic transmission element and an ultrasonic reception element symmetrically in relation to a straight line in a diameter direction orthogonal to the cylinder axis of a cylindrical inspection object, the inspection object being interposed between the ultrasonic transmission element and the ultrasonic reception element; transmitting ultrasonic waves from the ultrasonic transmission element at a plurality of positions in the diameter direction; receiving by the ultrasonic reception element the ultrasonic waves transmitted from the ultrasonic transmission element and transmitted through the inspection object by propagating through the inside of the inspection object; and inspecting the inspection object on the basis of a reception signal of the ultrasonic waves received by the ultrasonic reception element.

An ultrasonic inspection method that includes arranging an ultrasonic transmission element and an ultrasonic reception element symmetrically in relation to a straight line in a diameter direction orthogonal to the cylinder axis of a cylindrical inspection object, the inspection object being interposed between the ultrasonic transmission element and the ultrasonic reception element; transmitting ultrasonic waves from the ultrasonic transmission element at a plurality of positions in the diameter direction; receiving by the ultrasonic reception element the ultrasonic waves transmitted from the ultrasonic transmission element and transmitted through the inspection object by propagating through the inside of the inspection object; and inspecting the inspection object on the basis of a reception signal of the ultrasonic waves received by the ultrasonic reception element.

Disclosed are a method, apparatus and device for calculating signal attenuation, and a computer-readable storage medium. The method comprises: receiving (101) an ultrasound signal by an ultrasonic imaging system, performing (102) signal recovery operation on the ultrasound signal to obtain an ultrasound signal to be calculated; determining a type of the ultrasound signal to be calculated, and calculating (103) attenuation information of the ultrasound signal to be calculated by adopting a calculation mode corresponding to the type according to the type of the ultrasound signal to be calculated. As such, the signal attenuation calculation flow is simplified, thereby enabling use of commercial probes therein, bringing convenience in operation, and increasing applicability. Accuracy and efficiency of attenuation calculation can be improved by means of performing signal recovery on an obtained ultrasonic signal and then performing attenuation calculation thereon.

It is disclosed a method and device for testing a plate material (1) for the presence of pits and holes (3), said method including the steps of:

transmitting an acoustical signal from a transmitting transducer (2) facing the plate material (1) and positioned in a distance from the plate material, the frequency of the transmitted signal and the angle of incidence of the signal towards the plate material being adapted to promote the formation of Lamb signals in the plate material, receiving an acoustical signal returned from the plate material in a receiving transducer (4) also facing the plate material at a distance from the material, the receiving transducer (4) being located in a distance from said transmitting transducer (2) along the direction of the plate material, time gating the received signal identifying a tail part (8) carrying information from Lamb signals travelling in the material, and determining the energy content in said Lamb mode part of the signal.

It is disclosed a method and device for testing a plate material (1) for the presence of pits and holes (3), said method including the steps of:

transmitting an acoustical signal from a transmitting transducer (2) facing the plate material (1) and positioned in a distance from the plate material, the frequency of the transmitted signal and the angle of incidence of the signal towards the plate material being adapted to promote the formation of Lamb signals in the plate material, receiving an acoustical signal returned from the plate material in a receiving transducer (4) also facing the plate material at a distance from the material, the receiving transducer (4) being located in a distance from said transmitting transducer (2) along the direction of the plate material, time gating the received signal identifying a tail part (8) carrying information from Lamb signals travelling in the material, and determining the energy content in said Lamb mode part of the signal.

The document relates to a method of performing subsurface imaging of embedded structures underneath a substrate surface, using an atomic force microscopy system. The system comprises a probe with a probe tip, and a sensor for sensing a position of the probe tip. The method comprises the steps of: positioning the probe tip relative to the substrate: applying a first acoustic input signal to the substrate; applying a second acoustic input signal to the substrate; detecting an output signal from the substrate in response to the first and second acoustic input signal; and analyzing the output signal. The first acoustic input signal comprises a first signal component and a second signal component, the first signal component comprising a frequency below 250 megahertz and the second signal component either including a frequency below 2.5 megahertz or a frequency such as to provide a difference frequency of at most 2.5 megahertz with the first signal component, such as to enable analysis of an induced stress field in the substrate; and wherein the second acoustic input signal comprises a third signal component having a frequency above 1 gigahertz, such that the return signal includes a scattered fraction of the second acoustic input signal scattered from the embedded structures. This enables to perform imaging a various depths in one pass, across a large range of depths.

A system includes an acoustic monitoring, analysis, and diagnostic system having a processor. The processor is configured to receive NF noise signals from a near field (NF) microphone array, the NF microphone array measures noises from a power generation system in a NF. The processor is configured to receive FF noise signals from a far field (FF) microphone array, the FF microphone array measures noises from a power generation system in a FF. The processor is configured to derive NF and FF noise measurements based on the signals and to synchronize the NF and FF noise measurements to create synchronized NF and FF noise data. The processor is configured to analyze the synchronized NF and FF noise data to create a NF and an FF noise signature. The processor is configured to diagnose root causes of noises generated from the power generation system and to report the root causes.

An apparatus, system, program product, and method are disclosed for determining the microstructure and properties of materials using acoustic signal processing. An apparatus includes a one or more sensors for sensing information describing a multiphase material using sound waves. The apparatus includes a processor operably coupled to the one or more sensors and a memory that stores code executable by the processor. The code is executable by the processor to receive sound-wave input from the one or more sensors, perform one or more quantitative analyses on the received sound-wave input in the frequency domain, and determine a microstructure of the multiphase material based on results from the one or more quantitative analyses.

An apparatus, system, program product, and method are disclosed for determining the microstructure and properties of materials using acoustic signal processing. An apparatus includes a one or more sensors for sensing information describing a multiphase material using sound waves. The apparatus includes a processor operably coupled to the one or more sensors and a memory that stores code executable by the processor. The code is executable by the processor to receive sound-wave input from the one or more sensors, perform one or more quantitative analyses on the received sound-wave input in the frequency domain, and determine a microstructure of the multiphase material based on results from the one or more quantitative analyses.

A method for removing a guided wave noise in a time-domain may include recording one or more acoustic signals with one or more receivers at a first location, wherein the one or more acoustic signals are raw data. The method may further include determining a slowness range, estimating a downward guided wave noise by stacking the one or more acoustic signals based at least in part on a positive slowness, estimating an upward guided wave noise by stacking the one or more acoustic signals based at least in part on a negative slowness, and identifying a dominant direction of propagation. The method may further include identifying a slowness from a highest stacked amplitude for the dominant direction of propagation, estimating a downward guided wave noise with the slowness, estimating an upward guided wave noise with the slowness, and subtracting the downward guided wave noise and the upward guided wave noise.