150 results about "Body waves" patented technology

A method for assessing a condition of an organism having body waves corresponding to states of the organism. The method may include the step of recording signals corresponding to a body wave, output by a portion of the organism in a first state, to provide a first record. In a similar manner, signals may be recorded during a time period in which the organism is in a second state, to provide a second record. The first and second records, may be processed by applying feature expansion procedures thereto. The results of the feature expansion procedures may be evaluated to identify first selected feature expansion procedures effective to distinguish values of the first signals corresponding to the first state from values of the first signals corresponding to the second state.

The invention relates to a body wave resonator and a processing method thereof. The body wave resonator comprises an acoustic mirror arranged on or embedded in a substrate and provided with a first edge and a second edge, a dielectric layer which is arranged on the substrate and in full contact with the two edges of the acoustic mirror, a first electrode which is arranged on the acoustic mirror and composed of a first terminal part, a second terminal part and a main part which is arranged between the first and the second terminal parts, a piezoelectric layer which is arranged on the first electrode and composed of a main part, a first terminal part and a second terminal part, and a second electrode which is arranged on the piezoelectric layer and consists of a main part and a second part, wherein the main part is located above the main part of the piezoelectric layer and connected with the second part, so that the connected joint of the main part and the second part is arranged between the first edge and the second edge of the acoustic mirror, and an air gap is formed between the second part of the second electrode and the first terminal part of the piezoelectric layer. The body wave resonator has simple structure and convenient processing, and can improve the quality factor, effective electro-mechanical coupling factor and static discharge resistance capacity.

A method for assessing a condition of an organism having body waves corresponding to states of the organism. The method may include the step of recording signals corresponding to a body wave, output by a portion of the organism in a first state, to provide a first record. In a similar manner, signals may be recorded during a time period in which the organism is in a second state, to provide a second record. The first and second records, may be processed by applying feature expansion procedures thereto. The results of the feature expansion procedures may be evaluated to identify first selected feature expansion procedures effective to distinguish values of the first signals corresponding to the first state from values of the first signals corresponding to the second state.

The invention provides an electromagnetic ultrasonic thickness gauge for measuring the thickness of a specimen in a variety of abominable environments and a measurement method thereof. The electromagnetic ultrasonic thickness gauge is composed of a microcontroller, a transmitting circuit, an electromagnetic ultrasonic probe, a receiving switch, a conditioning circuit, an echo processing system, a display system and a keyboard, wherein the microcontroller is connected with the transmitting circuit which is connected with the electromagnetic ultrasonic probe, the electromagnetic ultrasonic probe is connected with the receiving switch which is connected with the microcontroller and the conditioning circuit, the conditioning circuit is connected with the echo processing system, and the display system is connected with the microcontroller which is connected with the keyboard. The electromagnetic ultrasonic thickness gauge uses a normal-incidence body wave to measure the thickness and achieves the measurement accuracy which is twice as high as that of piezoelectric ultrasonic thickness gauge at the same frequency. The electromagnetic ultrasonic probe which adopts a pulse electromagnet to offer magnetic field can effectively detect various metallic specimens; as a transceiving separated coil is used for exciting and detecting ultrasonic waves, the blind area for the measurement is small and the measurement thickness can be in a range from 3mm to 200mm.

The invention provides a reservoir wave impedance prediction method based on dipole wave, which comprises the following steps that: logging data is analyzed to acquire the corresponding parameter data of the seismic response characteristics of a reservoir; well seismic calibration is carried out according to the logging and seismic data so as to extract wavelets and determine the time-depth relationship; the seismic response characteristic wave function of impedance changes is constructed according to the parameter data, the wavelets and the time-depth relationship; the way integral characteristics of the logging data are extracted according to the seismic response characteristic wave function to form a seismic response model database; the seismic data beside a well is analyzed according to the seismic response model database to work out an impedance interpretation spectrum of the seismic data beside the well; a seismic trace is analyzed according to the seismic response model database to work out a data body wave impedance spectrum; and the wave impedance is predicted according to the seismic response model database, the impedance interpretation spectrum and the data body wave impedance spectrum. According to the reservoir wave impedance prediction method based on the dipole wave, the wave impedance of the reservoir is predicted through the seismic characteristics and wave impedance change rules based on the analysis to the logging data, so that the precision in predicting the wave impedance of the reservoir and the resolution to thin reservoirs are improved.

An apparatus for generating seismic body waves in a hydrocarbon reservoir includes a closed-loop borehole source having a resonant cavity for generating resonant energy, a drive source and a control unit. The drive source injects pressure pulses to the resonant cavity at a predetermined or selectable pressure and frequency. The fluid circulates between the cavity and the drive source in a closed-loop fashion. In another embodiment, the borehole source utilizes a smart or controllable material that is responsive to an applied excitation field. The cavity includes an excitation coil for providing an excitation field that changes a material property of the smart fluid. The control unit is programmed to adjust operating parameters to produce seismic waves having a selected frequency and amplitude. In one embodiment, a control unit adjusts operating parameters in response to measured parameters of interest or surface commands.

A downhole acoustic logging tool is used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface and is converted back into a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector.

The invention aims at providing an automatic detection method of an oblique incidence body wave technical steel plate, which carries out comprehensive and fast detection to steel plates with the thickness of less than 75mm and accurately detects various defects, and a device thereof, and the device consists of an electromagnetic ultrasonic detection unit and a circuit system. The invention adopts the oblique incidence body wave mode to carry out detection to the steel plates, which not only is more sensitive to the detect in size, but also can detect the defects of cracks and the like, thus having more comprehensive detection result. The detection unit adopts a mode that transverse arrangement and longitudinal arrangement are combined, thus being more sensitive to the defects of the transverse and the longitudinal direction. The invention combines an ultrasonic transmission method and a reflection method, which not only has higher sensitivity to the defects, but also can position the defects precisely, thus having higher confidence level of the detection result. The invention has wider range for detecting the thickness of the wall of the steel plate, with the highest of 75mm, thus meeting the requirements for the steel plate with thick wall.

The present disclosure is related to apparatuses and methods for downhole acoustic logging. The tool may be used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface, and is converted back into a a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector. Methods may include processing of acoustic logging signals including: wavefield separation, auto-correlation of wavefield components, filtering using a dip filter, and estimating a distance to the reflective interface.

One or more autonomous devices are deployed in the well to provide a moveable sensor source or obstruction for coupling a tube wave seismic signal into the formation adjacent the well bore. The autonomous devices move in the well and provide moveable obstructions or discontinuities which couple tube waves existing in the well bore or production tubing into the formation adjacent the well bore. Wellbore tube wave energy is converted to body wave energy at minor borehole obstructions or irregularities that become sources of seismic energy. A well bore may contain a plurality of minor obstructions or discontinuities. Each obstruction or discontinuity position along the borehole has an associated unique waveform source coda that may be measured for processing the wavefield radiated into the earth formation surrounding the well bore. A plurality of sensors detects the radiated seismic energy after the seismic energy has transited intervening earth formations. The system may be employed as a permanent monitoring device for mineral resource management so that measurements may be acquired at many different times. A time lapse profile may be created that is representative of the temporal and areal changes in the petrophysical characteristics and mineral content or distribution of the intervening earth formation.

The invention relates to a method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of a metal material. The method comprises the following steps: 1) excitation and reception of Rayleigh waves; 2) detection of reliability of a testing system; 3) measurement of non-linear coefficients when the surface of a test piece has damage of different degrees; 4) repeatable operation of test. Compared to the method of using body waves for ultrasonic nondestructive test, the non-linear ultrasonic evaluation method provided in the invention has the characteristic that Rayleigh surface waves are especially suitable for measurement of non-linear coefficients of large-scale complex plate structures. According to the invention, it is only needed to carry out excitation and measurement of supersonic waves at one side of a structure during measuring, which enables measuring to be simple and easy; the Rayleigh surface waves have advantages favorable for measuring, e.g., concentration of energy on the surface of a structure, a long propagation distance, etc.; operation is simple and easy, so the method is especially suitable for on-site detection of structural elements; effective evaluation of early damage and degeneration of mechanical properties of a material structure can be realized by using the non-linear ultrasonic method.

The invention relates to a global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity. The method comprises the following steps that (1), initial parameters of the inversion are given to construct an unknown vector population represented by binary coding; (2), theoretical calculation methods of a surface wave dispersion curve and a body wave HVSR curve are determined; (3), an object function simultaneously fitting the surface wave dispersion curve and the body wave HVSR curve is established; (4), global optimization calculation of genetic simulated annealing is conducted to obtain a globally optimal solution; and (5), the shallow velocity structure can be obtained based on the globally optimal solution. Advantages of genetic and simulated annealing methods are combined, efficiency and accuracy of the inversion can be improved, application in urban areas with the survey lines being difficult to unfold can be achieved, and application in background noise, seismic measuring or strong earthquake records and other data sources can be achieved.

The invention provides a method for attenuating near-surface scattered waves. The method comprises the following steps that: an energy-balanced gun set wave field and an energy-balanced through wave field are inputted; the gun set wave field and the through wave field are processed according to through wave seismic interferometry technique, such that a time-domain near-surface scattered wave field is obtained; and the time-domain near-surface scattered wave field is filtered from the gun set wave field through using multichannel adaptive matching wave filtering technique. The method for attenuating the near-surface scattered waves of the invention can predict near-surface scattered waves of various types including side scattered waves, and therefore, near-surface scattered waves generated by complex and non-uniform ground surface can be effectively predicted and attenuated, and body wave signal to noise ratio of seismic data of complex mountains can be improved, and the obtaining of high-quality seismic exploration data can be benefitted; and thus, the method for attenuating the near-surface scattered waves of the invention is applicable to the processing of seismic data of complex near-surface areas such as gravel areas and mountains.

The invention provides a microfluidic device and a system and a method for introducing a substance into a cell. The microfluidic device comprises a cavity channel, a body wave generating device and asound surface wave generating device, wherein a microstructure is arranged on the inner wall of the cavity channel and is configured in a manner that a solution can forms bubbles at the microstructurewhen being injected into the cavity channel; the body wave generating device is used for generating body waves to drive the bubbles to resonate so as to generate a flow field; and the sound surface wave generating device is used for generating sound surface waves so as to control the positions of particles in the solution. According to the microfluidic device, the positions of the particles in the solution can be precisely controlled by virtue of the sound surface wave generating device, and therefore, the shear stress borne by the particles in the solution can be precisely controlled.

The embodiment of the invention discloses a pile foundation integrality detection method. The method includes the following steps that according to the size of a pile diameter, two to four detection sensors are symmetrically arranged on a pile center; a pile head is cleaned, and waveforms are generated in a pile through a shock excitation device; at least three effective signals are recorded by each detection sensor, and the waveform recurrence and the pile bottom reflection of the effective signals have no obvious abnormity; the concrete structure of a pile body is judged by judging the defect type parameter F. By means of the pile foundation integrality detection method, by collecting changes of wave impedance and reflecting the positions of pile bottom reflected waves on the time domain or the frequency domain, the pile body wave velocity is worked out, integrality evaluation is conducted on the pile body, the defective degree and position of the pile body are determined, and the pile foundation integrality detection method has the advantages of being sensitive in detection and integral.

The invention relates to four crystal lattice phase structural piezoelectric crystal. The chemical formula is M23NeAl3Si2O14, wherein Me is Ca, Sr or Ba, Ne is Sb, Nb or Ta. The space group is P321. The invention obtains the compound of the structure at high temperature by solid phase synthesizing method, and then generating monocrystal by crystal generation method such as a hauling method, a pot descending method and so on. The piezoelectric constant obtained e11 is more than that of lanthanum gallium silicate single crystal, which is to manufacture sound surface wave or sound body wave piezoelectric apparatus.

The present invention provides an incident plane body wave excitation method in either direction in slope seismic response value simulation, belonging to the geologic hazard analysis and control field. The method comprises six steps: slop modelling; time series analysis starting of each node on the slope bottom excitation boundary of the incident plane body wave excitation method in either direction; stress component time-history calculation generated at each node at the slope bottom through different seismic phase body wave excitation; superposition time-history calculation of different body wave seismic phase fluctuating stress component at the slope bottom excitation boundary nodes; slope bottom excitation boundary node body wave excitation input; and dynamic response result extraction of each node in the slope model. The incident plane body wave excitation method in either direction in the slope seismic response value simulation can solve the problem of the incident seismic wave input in either direction in the slope seismic response value simulation, realize the incidence of the seismic plane body wave in either direction including oblique incidence and vertical incidence, reveal the influence of the seismic plane body waves with different incident directions on the slope seismic dynamic response and the diversity of the seismic slope failure, and has great significance.

The invention discloses a laser ultrasonic transmission type time-delay detection method for internal defects of a material. The method comprises the following steps: firstly, enabling pulse laser excited by a laser device to act on the surface of a sample so as to excite ultrasonic body waves; secondly, focusing detection laser on a centering position of excited laser so as to detect ultrasonic body wave signals; thirdly, scanning a two-dimensional moving sample, and carrying out mutual correlation calculation on ultrasonic wave signals obtained at all scanning points by taking ultrasonic bodies with relatively high signal to noise ratios at non-defect position of the sample as reference waves; and finally, calculating the waveform correlation coefficients of the ultrasonic wave signals and time delay values of waveforms with the highest correlation coefficients, so as to finish the detection of the internal defects. The method has high sensitivity and stability to the detection of the internal defects, particularly sub-millimeter microdefects, the accurate positioning and quantification of the internal defects can be realized, and the method is suitable for nondestructive testingof various materials.

The invention relates to a cone of a thin speaker, comprising a cone edge and a cone body. The cone is characterized in that the cone body is annular and provided with a cone central hole in the center, the cone edge central hole is in the shape of a wave having a central hole wave crest and a central hole wave trough which respectively radially extend towards the edge by taking the center of the cone body as a base point, and a body wave crest surface and a body wave trough surface are formed on the surface of the cone body; the cone has an annular edge which comprises a cushion edge and a deflector ring the shape of which is the extension of the shaped of the cone body which radially extends towards the edge from the center, and the deflector ring has a deflector ring wave crest surface and a deflector ring wave trough surface; the cone body is arranged on the cone edge, and the lower surface of the body wave crest surface and the lower surface of the body wave trough surface respectively cling to the upper surface of the deflector ring wave crest surface and the upper surface of the deflector ring wave trough surface. The invention has reasonable structure, low degree of distortion, excellent tone quality, preparation by traditional materials, convenient material obtaining, better rigidity, simple forming process and low cost.

The invention discloses a completely transparent microfluidic acoustic body wave chip and a preparation method thereof. The product consists of three glass sheets and one piece of piezoelectric material. The three glass sheets are stacked from top to bottom to form a standing wave reaction chamber, the upper glass sheet is equipped with holes for fluid to come in and out by laser, and thick piecesof polydimethylsiloxane (PDMS) with corresponding holes are bonded to the surface holes. A micron-scale channel is prepared on the middle glass sheet by laser cutting and penetration of the glass. The lower glass is complete glass, and is used for chamber encapsulation. The piezoelectric material is made of lithium niobate single crystal, the upper surface and lower surface of the piezoelectric material are both plated with a layer of transparent tin-doped indium oxide (ITO) conductive film, and the piezoelectric material is sticked at the lower surface of a resonant cavity, both sides of thelithium niobate wafer undergo silver slurry curing, and two leads are led out. The chip prepared by the method provided by the invention is completely transparent and highly visible, and can be usedfor gathering, separation and manipulation of cells/particles and other samples. The preparation process adopted by the invention is simple, and the cost is low.