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74 results about "Wave train" patented technology
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Parallax panoramagram having improved depth and sharpness
A parallax panoramagram has increased depth and sharpness when a sharpness filter is applied after interdigitation of multiple image portions. An optical path of wave train (204) (on-axis) and wave train (205) (off-axis) intersect a single lenticle (201). The lenticle has a focal length (208) and the on-axis (204) and off-axis (205) wave trains correspond to different stripes. These wave trains (204 and 205) comme to focus at points (206 and 207) respectively. The surface (202) has a cylindrical curvature, and bracket (203) denotes the width of the lenticle (201). Each eye of the observer sees its own perspective view when looking at a lenticular stereogram.
Owner:LEDOR LLC +1
Vehicular millimeter-wave train collision avoidance radar system
ActiveCN103235310ATo achieve the purpose of collision avoidanceImprove anti-interference abilityRadio wave reradiation/reflectionLocal oscillator signalRadar systems
The invention provides a vehicular millimeter-wave train collision avoidance radar system which comprises a frequency synthesizer module, a transmitting module, a receiving module, an antenna feeder module, and a signal processing module. The frequency synthesizer module is used for generating X-band transmitting excitation signals and X-band receiving local oscillator signals. The transmitting module is used for doubling the frequency of the X-band transmitting excitation signals to Ka band. The antenna feeder module comprises a transmitting antenna, Kn receiving antennas and n single-pole K-throw switches. Each two adjacent K receiving antennas are connected with the receiving module through one single-pole K-throw switch. The receiving module comprises n receivers. Each receiver is connected with one single-pole K-throw switch in the antenna feeder module. The signal processing module is used for processing the received signals to obtain the distance, speed and angular information of a target, and transmitting the information to a train central control system. The train central control system issues stop commands to trains. The vehicular millimeter-wave train collision avoidance radar system is installed on the train and is capable of accurately detecting obstacles in front of the train to well functionally avoid train collision.
Owner:北京理工雷科电子信息技术有限公司
Motor vehicle spring comprising fiber composite material
InactiveUS20090200721A1Width variationThickness variationResilient suspensionsVehicle springsMobile vehicleMassive gravity
A band spring including fiber composite material and extending in an undulating way, wherein a spring band can be provided to meander in the form of one single wave train composed of reversal regions and intermediate portions around a longitudinal center line L which can substantially correspond to the direction of force introduction K, and wherein, there can be provided an increased resistance moment of the spring band in the reversal regions of the wave train.
Owner:MUHR UND BENNDER KG
Radar sensor for motor vehicles
ActiveUS20190265346A1Improve accuracyEasy to separateRadio wave reradiation/reflectionWave trainSignal generator
A radar sensor for motor vehicles, having a signal generator that is configured to generate a radar signal that contains a cyclically repeating sequence of N wave trains, where j=1, . . . , N, which are transmitted successively at time intervals T′c,j and which occupy respective frequency bands that differ from one another in terms of their center frequencies fc,j, wherein the relationship applicable to the time intervals T′c,j and the center frequencies fc,j is: T′c,j*fc,j=X, where the parameter X is constant.
Owner:ROBERT BOSCH GMBH
Method of acoustic logging and quantifying cavern filling degree
InactiveCN103064118AEasy to operateHigh precisionSeismology for water-loggingWave trainLongitudinal wave
The invention relates to a method of acoustic logging and quantifying a cavern filling degree and belongs to the field of petroleum and geology. The method comprises the following steps that 1 a stratum model is established: a real environment of an actual shaft acoustic wave instrument is imitated, wherein a stratum is made of limestone, the longitudinal wave time difference is 154 microseconds per meter and the density is 2.7g / cm<3>; 2 acoustic numeral is simulated: acoustic wave whole wave train data and an imitated acoustic wave whole wave train curve with the different filling degrees are obtained; 3 acoustic wave interval transit time is extracted and the transversal and longitudinal wave acoustic wave interval transit time with the different filling degrees are calculated; 4 response regularity of the interval transit time and the filling degree is analyzed; and 5 a quantification calculation model of the cavern filling degree is established and response characteristics of the acoustic wave interval transit time caused by the different filling degrees and the regulation of the response characteristic are analyzed. According to the numerical simulation to a sound field in a barefoot well, the filling degree calculation model is established to quantifying and assessing the different filling degrees in a cavern type reservoir stratum so that practicality is high and popularization and application value is good.
Owner:SOUTHWEST PETROLEUM UNIV
Method of advanced detection of breaking-loss wing coal seam of coal road based on single offset pair observation system
InactiveCN103217719AEasy constructionAccurate detectionSeismology for water-loggingWave trainEngineering
Owner:CHINA UNIV OF MINING & TECH
A method for intelligent detection of foundation pile quality
InactiveCN102269814AAvoid the influence of human factorsImprove detection accuracyAcoustic wave reradiationWave trainMeasuring instrument
The invention discloses a method for intelligently detecting the quality of foundation piles. The steps are as follows: 1) select a number of standard foundation pile samples, and vertically excite sound waves on the top of the sample foundation piles; 2) Multiple excitation-reception is performed on the same foundation pile, and the signals received multiple times are superimposed to improve the signal-to-noise ratio; 3) According to the (defect position w, length l ) parameters and recorded signal waveforms, train the foundation pile intelligent detection model, and determine the signal processing model parameters suitable for the measurement environment and measuring instruments; The method is used to obtain signal wave trains for processing, extract and automatically identify the arrival time of the defect reflection wave and the bottom reflection wave of the foundation pile, and then determine the defect position w and length l of the foundation pile.
Owner:YANGTZE UNIVERSITY
Low frequency acoustic deterrent system and method
InactiveUS20110176391A1No pollution to the environmentReduce development costsAnimal huntingAnimal repellantsUnderwaterWave train
The disclosed embodiments provide an acoustic deterrent system and a method for repelling sea mammals from a region of water. The system consists of one or more acoustic impulse sources spatially distributed underwater around the perimeter of the fish farm or other region to be protected. Each source is capable of generating an acoustic signal and a controller determines the firing time for each source to produce signals, which may include precisely timed wave trains of superimposed tones on a broadband low frequency signal, which are believed most effective in deterring seals, sea lions and other carnivorous mammals. The system may further include a sensing device to determine the presence of marine mammals so that the acoustic deterrent can be initiated on demand.
Owner:HYDROACOUSTICS INC
Radar sensor for motor vehicles
ActiveUS11199617B2Improve accuracyEasy to separateRadio wave reradiation/reflectionWave trainSignal generator
A radar sensor for motor vehicles, having a signal generator that is configured to generate a radar signal that contains a cyclically repeating sequence of N wave trains, where j=1, . . . , N, which are transmitted successively at time intervals T′c,j and which occupy respective frequency bands that differ from one another in terms of their center frequencies fc,j, wherein the relationship applicable to the time intervals T′c,j and the center frequencies fc,j is: T′c,j*fc,j=X, where the parameter X is constant.
Owner:ROBERT BOSCH GMBH
High precision digital sonic wave variable density scale method
ActiveCN101451432ASpeed up production debuggingEase of mass productionSurveyElectrical resistance and conductanceWave train
The invention relates to a high-precision digital acoustic variable density graduating method, which comprises: soaking an acoustic sonde of a variable density acoustic instrument in a graduated drum filled with water at a pressure of 2MP, or using a sine wave signal source of which the frequency is 20KHz to provide a signal without amplitude limit at a highest gain grade to a signal acquisition circuit of the instrument; fully resetting each correction coefficient of acoustic wave at each grade to be 1; acquiring several data with maximum values in a wave train, and calculating a mean value X1; using the formula X0 (40 percent)<n>Xn to calculate the correction coefficient; fading the density of the acoustic wave to 40 percent of the last grade in turn, and repeating the above steps for 8 grades; and storing the correction coefficient into a storage device of the variable density acoustic instrument. Therefore, the graduation precision of the instrument does not depend on precision of a high-performance resistance network; and the method reaches the precision through calculation and correction of software, improves test running speed of the instrument, and is favorable for large-scale production of the instrument.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Non-linear temperature compensation method for digital sound wave variable density sonic system
The invention relates to a nonlinear temperature compensation method for a digital acoustic variable density system, which comprises the following steps: embedding a temperature sensor in the acoustic variable density system for testing temperature-dependent characteristics of a piezoelectric transducer in the acoustic system, storing the result in a plug-pull chip, digitalizing wave train signals, measuring the current temperature of the acoustic system by the temperature sensor embedded in the acoustic system, and calibrating the temperature of the digitalized wave train data according to the calibration value of a temperature characteristic table of the acoustic system to generate calibrated acoustic variable density wave train signals irrelevant to the environmental temperature. Accordingly, the change of a piezoelectric transducer in the acoustic system can be subjected to temperature compensation only by measuring the current temperature of the acoustic variable density system and using a pre-calibrated calibration coefficient of the temperature characteristic calibration table of the acoustic system without changing the piezoelectric crystal transducer acoustic system and screening the temperature property, thus eliminating the influence of the temperature on the acoustic variable density.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Detection method of steel pipe concrete cavity defect extracted on basis of HHT characteristics
InactiveCN106053597AEfficient extractionInhibition endpoint effectAnalysing solids using sonic/ultrasonic/infrasonic wavesWave trainMechanical impact
The invention discloses a detection method of a steel pipe concrete cavity defect extracted on the basis of HHT characteristics. The method comprises the following steps: (1) applying mechanical impact on a detection point on the surface of steel pipe concrete to excite stress waves, using a sensor to receive the stress wave detection signals; (2) adopting an HHT algorithm to extract cavity characteristic signals from the stress wave detection signals to obtain a characteristic Hilbert marginal spectrum; (3) changing the detection point, repeating step (1) and (2); subjecting the characteristic Hilbert marginal spectrums corresponding to different detection points to an image wave train display; and judging the size of cavity of steel pipe concrete according to the characteristic Hilbert marginal spectrum. By accumulatively displaying the images of characteristic Hilbert marginal spectrums of multiple detection points, the situation of cavity defects in steel pipe concrete can be directly display and calculated, and the method has the advantages of strong reliability, and accurate detection result.
Owner:HUNAN UNIV OF SCI & TECH
Polarization-maintaining fiber Verdet constant measuring device and measuring method based on Mach-Zehnder and Michelson interferometers
ActiveCN106546411AUniversalHigh measurement sensitivityTesting fibre optics/optical waveguide devicesWave trainPolarization-maintaining optical fiber
The invention discloses a polarization-maintaining fiber Verdet constant measuring device and a measuring method based on Mach-Zehnder and Michelson interferometers, and belongs to the technical field of fiber application. The measuring device comprises a wave train analysis module which is composed of a Mach-Zehnder interferometer and a Michelson interferometer. The measuring method comprises the following steps: selecting the length of a delay ring; gradually shortening the delay ring by equal length; recording interference fringes when the light of a reference light path interferes with the light of a signal light path; applying a magnetic field, making the light of the reference light path interfere with the light of the signal light path again, and recording interference fringes; and calculating the Verdet constant. The measuring device and the measuring method can be applied to most types of polarization-maintaining fibers and can also be extended to single-mode fibers, and is generally applicable. Measurement can be completed only by intercepting a section of fiber. The measuring sensitivity is high. Engineering application is facilitated.
Owner:BEIHANG UNIV
Vehicular millimeter-wave train collision avoidance radar system
ActiveCN103235310BTo achieve the purpose of collision avoidanceImprove anti-interference abilityRadio wave reradiation/reflectionLocal oscillator signalRadar systems
Owner:BEIJING RACOBIT ELECTRONIC INFORMATION TECH CO LTD
While-drilling sound wave well cementation quality evaluation method and processing device
The invention discloses a while-drilling sound wave well cementation quality evaluation method and a processing device. The while-drilling sound wave well cementation quality evaluation method comprises the steps that 1, while-drilling data are pre-processed, and full-wave train data of array sound waves are obtained; 2, the influence of drill collar waves in the head waves is eliminated; 3, the energy of a head wave is calculated, and the wave energy of a sleeve in a window is calculated according to the length of the window; 4, a head wave array attenuation factor is calculated, and a corresponding array attenuation factor is calculated according to the obtained head wave energy; 5, a cementation index is calculated, and the cementation index is calculated by using a cementation index calculation formula according to a fitting formula of the attenuation factor of the block and the CBL; 6, the well cementation quality is comprehensively evaluated by using a cementation index curve; and 7, whether all the depth points are processed or not is judged, if so, processing is ended, and if not, the steps are repeated until all the depth points are processed. According to the while-drilling sound wave well cementation quality evaluation method, the problems of long time consumption and high cost during well cementation quality evaluation of highly-deviated wells and horizontal wells in cable logging can be solved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Capacitive sensor-based wave run-up measuring system
ActiveCN107014282AEasy to installRich dataUsing electrical meansElectrical/magnetic thickness measurementsWireless transceiverWave train
The invention relates to the technical field of measuring instruments, can record a climbing process of a water body on a slope surface under a wave train effect, time distribution and transverse space distribution of the climbing height of waves are learned in real time, after collection is finished, a software side immediately obtains each accumulation rate run-up value through statistics, thus accurately measurement of wave run-up is realized, and arrangement of a measuring plate is convenient and data export is simple. The capacitive sensor-based wave run-up measuring system is characterized in that the system comprises a run-up measuring module unit and a data processing unit; the run-up measuring module unit includes a measuring bottom plate, an adjustable support used for adjusting an angle between the measuring bottom plate and a horizontal plane, a plurality of capacitive sensors mounted on the top surface of the measuring bottom plate, an AD conversion module connected with the capacitive sensors in sequence and a first wireless transceiving device; and the data processing unit includes an upper computer and a second wireless transceiving device connected thereto, and the first and second wireless transceiver devices are wirelessly connected and data are transmitted therebetween.
Owner:ZHEJIANG INST OF HYDRAULICS & ESTUARY
Petroleum-logging data processing method
InactiveCN101655878ARealize information managementEasy to edit and modifySurveySpecial data processing applicationsWave trainData retrieval
The invention relates to a petroleum-logging data processing method. The method comprises the following steps: (1) establishing an oil well information table and a petroleum-logging team information table; (2) importing original petroleum logging data which are measured by a petroleum-logging instrument and are in formats of curves, spectrums, wave trains, bivariate tables or streams; (3) pre-processing the original petroleum-logging data; (4) establishing a corresponding basic information table according to the pre-processed petroleum-logging data; and (5) establishing a summery data table which at least includes an oil well mark, a petroleum-logging team mark, a start depth, an end depth, a data category, a processing mark, a table name and comment information. The invention solves the technical problems of very complicated data processing steps, data retrieval and inconvenient comparison and check in the prior art and has the advantages that the information management of an oil wellcan be realized, petroleum-logging data in any format in the prior petroleum-logging technical field can be saved, and the like.
Owner:FOURTH MILITARY MEDICAL UNIVERSITY +1
Wave velocity testing method and device by single-hole method and terminal device
InactiveCN108919340ARealize measurementHigh precisionVelocity propogationSeismic signal receiversCross correlation analysisMutual correlation
The invention belongs to the technical field of engineering testing, and provides a wave velocity testing method and device by a single-hole method and a terminal device. The wave velocity testing method comprises the steps that firstly, a vibration source vibration signal generated by a surface vibration source device at a resonant frequency is obtained, a vibration source vibration waveform is generated, and the resonant frequency is the resonant frequency of a system formed by excitation blocks and strata in the vibration source device; vibration signals of measuring points in boreholes detected by a wave detector are obtained, and a corresponding measuring point vibration waveform is generated; then a wave train figure is obtained according to a mutual correlation analysis method, themeasuring point vibration waveform of the measuring points and the vibration source vibration waveform; and finally, the wave velocity testing results are obtained according to the wave train figure.The measurement of seismic waves is realized, the accuracy of seismic wave measurement in the strata is improved, and the study of the characteristics of foundation soil is facilitated.
Owner:河北中核岩土工程有限责任公司
Ultrasonic imaging well measuring method
InactiveCN110159253AIntuitive knowledgeShorten the cycle of measuresSurveyConstructionsWave trainExternal interface
The invention discloses an ultrasonic imaging well measuring method. A rotating probe is connected with an energy converter. The rotating probe drives the energy converter to rotate. In the rotating process of the energy converter, one ultrasonic pulse signal is stimulated to scan an oil well to be measured at 360 degrees, and thus the ultrasonic pulse signal can be broadcast in fluid of the oil well to be measured and merged into the inner wall of a casing pipe of the oil well; the ultrasonic wave train reflected from the external interface and the internal interface of the casing pipe is measured, information of the inner diameter of the casing pipe is obtained according to echo time of the received ultrasonic wave train, the thickness information of the inner wall of the casing pipe isobtained according to the resonance wave frequency of the casing pipe, and acoustic impedance information of ring space is obtained according to the resonance wave head wave scope. By means of one-time well going, quality of cement bonding and the casing pipe is evaluated, the measure period is shortened, and the operation cost is reduced. Accurate judgment can be made to solid phase cement, liquid phase water, uncemented microgaps and gas, and the phase state of the ring space can be known more intuitively. The inner diameter, the outer diameter, the wall thickness and the corrosion situationof the casing pipe can be recognized, and quantitative judgment is made for the corrosion situation of the casing pipe.
Owner:太平洋远景石油技术(北京)有限公司
Method for detecting digital acoustic head waves
The invention belongs to the field of acoustic logging, specifically relates to a method for detecting digital acoustic head waves. The existing method for detecting acoustic head waves is a threshold method which is characterized in that a fixed threshold value Vs is determined by an algorithm or inputted by an operator, therefore, in the method, the determination of the threshold value limits the correctness in detecting the head wave. The method for detecting digital acoustic head waves comprises the following steps: 1) initializing; 2) selecting the Tf and Ts of appropriate wave trains; 3) limiting the time detection range of the head wave of each wave train; 4) calculating the threshold value Vs of the head wave of each wave train; 5) detecting the time T1 of the head wave of each wave train; 6) fitting the time line of the head wave of each wave train by using the least square method, then reversely reasoning the theoretical times of the head waves, and comparing the obtained times; 7) searching samples Td with a threshold value less than the threshold value Vs from the head wave of each wave train; and 8) searching the largest sample as the position of the head wave between T and Td. The acoustic head waves detected by using the method provided by the invention are high in accuracy.
Owner:XIAN WELL LOGGING ENERGY TECH
Segmental generation method for waves in towing tank
The invention relates to a segmental generation method for waves in a towing tank, which belongs to the technical field of marine engineering experimental research. The method is characterized by comprising the following steps that: when an irregular wave simulation experiment is performed in the towing tank, the length of the tank is limited, wave train data of irregular waves are relatively long, and a wave train generated by a wave generator is not finished when a tow truck runs on a track around the whole experimental site at the speed set in the experiment, so that the wave train is divided into segments, when a segment of wave train data are completed, the tow truck is returned to a starting point and is operated again in the next segment of wave train until the wave generator generates the whole train wave; and the acquired experimental data are integrated to form a group of complete wave spectrum simulation experiment processes. The method has the advantages that: the characteristics of irregular wave spectrums can be fully and truly reflected when an effect of the irregular waves on moving ships is researched in the towing tank.
Owner:DALIAN UNIV OF TECH
Method for detecting burial depth of underground pipeline through cross-hole ultrasonic method
PendingCN111678467AExtended service lifeNot easy to shakeUsing subsonic/sonic/ultrasonic vibration meansGeological measurementsA wave amplitudeWave train
The invention relates to a method for detecting the burial depth of an underground pipeline through a cross-hole ultrasonic method, and relates to the technical field of geotechnical engineering, andthe method comprises the steps: S1, preliminarily detecting the position and burial depth of the underground pipeline; S2, conducting hole forming through a drilling machine, and drilling holes in thetwo sides of the underground pipeline; S3, burying acoustic pipes, burying the two acoustic pipes in drill holes in the two sides of the underground pipeline in a one-to-one correspondence mode, wherein the acoustic pipes are parallel to each other; S4, measuring points, namely selecting a plurality of sound measuring points along the axial direction of the sound measuring tubes, respectively placing a receiving transducer and a transmitting transducer of the ultrasonic detection analyzer into the two sound measuring tubes, and measuring the ultrasonic sound velocity and wave amplitude of theplurality of sound measuring points; and S5, calculating the depth of the underground pipeline, generating an ultrasonic wave train diagram by taking the sound measuring point as a longitudinal axisand taking the sound velocity and the wave amplitude corresponding to the sound measuring point as a transverse axis, and calculating the burial depth of the underground pipeline according to the ultrasonic wave train diagram. The method has the advantages of being wide in application range and capable of detecting the burying depth of the underground pipeline with the large burying depth.
Owner:浙江省工程勘察设计院集团有限公司
Imaging method for longitudinal and transverse radial speed changes
ActiveCN107605470AImprove permeabilityGood feature correspondenceBorehole/well accessoriesWave trainLongitudinal wave
The invention discloses an imaging method for longitudinal and transverse radial speed changes. The imaging method belongs to the field of geophysical log. In the method, monopole emission, a plurality of receiving stations collect via a plurality of sound wave logging instruments; on the basis of slowness time relative STC method, with changes of positions of the receiving stations, stratum speedcorresponding to received wave trains is changed; and the stratum slowness is inverted by the inverted STC method, and a radical change speed section can be achieved. The method can conduct processing and analysis according to different modes in full waves and suitable for longitudinal and transverse waves at the same time; longitudinal and transverse radical speed sections can be obtained; and according to longitudinal and transverse radical speed changes, stratum permeability, alteration and anisotropies can be indicated.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Automatic measuring device for seawall top wave overtopping rate of laboratory trough testing
The invention discloses an automatic measuring device for the seawall top wave overtopping rate of laboratory trough testing. A seawall model is transversely arranged in a trough and provided with a wave wall. The device is arranged behind the seawall model and comprises a water collection trough, a water collection tank, a water level tracker and a computer. The upper end of the water collection trough is vertically placed in the center of the top of the wave wall, and a water outlet is formed in the lower end of the water collection trough. A water inlet of the water collection tank is located below the water outlet of the water collection trough. The water level tracker is fixed to the water collection tank and used for measuring the water level in the water collection tank. A data collection card is arranged in the computer and collects water level data in the water level tracker, the computer calls the water level data to generate a process curve that the water level changes along with time, and the process curve is displayed and stored. In the measuring process of the device, worker intervention is not needed, the measuring process is automatically completed, and the result accuracy is high; and the measuring result can really reflect wave overtopping rate values generated by different-size waves in wave trains.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
Method and device for determining well cementation quality and storage medium
Owner:CHINA OILFIELD SERVICES
Radar sensor for motor vehicles
Owner:ROBERT BOSCH GMBH
Multi-port network test platform and method for rail transit millimeter wave train-ground wireless communication system
PendingCN111726779ASignificant technological progressEffective evaluationParticular environment based servicesFor mass transport vehiclesWireless transceiverTimestamp
The invention relates to a multi-port network test platform and method for a rail transit millimeter wave train-ground wireless communication system, and belongs to the field of rail transit communication. The system comprises a vehicle-mounted radio system test unit, a vehicle-mounted radio control unit, a vehicle-mounted wireless transceiver, a channel simulator, a ground wireless transceiver, apartition radio control unit and a ground radio system test unit. Before and after the service flow of each port is tested, the vehicle-mounted radio system test unit and the ground radio system testunit complete two times of time difference statistics through time synchronization signals sent by an RJ45 port, fits to obtain a linear function relationship between the time difference between thetwo ends and the timestamp, and finally completes statistics of the time delay and the packet loss rate of each port of the millimeter wave train-ground wireless communication system through the timestamp and the port number of each port receiving and sending data packets. According to the invention, the function and the performance of the millimeter wave train-ground wireless communication systemcan be effectively and comprehensively tested.
Owner:SHANGHAI UNIV
Method and device for detecting first arrival of well wall ultrasonic echo signal
PendingCN114114283AImprove image qualityImprove reliabilityConstructionsAcoustic wave reradiationFull waveWave train
The invention provides a well wall ultrasonic echo signal first arrival detection method comprising the following steps: reading and extracting a to-be-processed well wall ultrasonic pulse original full-wave train waveform, and carrying out amplitude reduction and de-noising processing to obtain a high signal-to-noise ratio ultrasonic pulse full-wave train waveform; re-sampling is carried out on different directions of a certain depth point, ultrasonic pulse emission waves are extracted, and a pure ultrasonic pulse echo waveform is obtained through calculation in combination with a high-signal-to-noise-ratio ultrasonic pulse full-wave train waveform; normalizing the ultrasonic pulse echo waveform and combining with a convolutional neural network mark to obtain a time window range containing a first arrival wave; solving an amplitude envelope line of the normalized ultrasonic pulse echo waveform, and determining the arrival time of a first arrival wave in a time window range; and by taking the sampling point corresponding to the arrival time of the first-motion wave as a starting point, constructing a rectangular window function with a preset width to obtain the amplitude of the first-motion wave. The method disclosed by the invention is applied to a while-drilling and cable ultrasonic imaging logging technology, and has remarkable effects in the aspects of detection precision, anti-noise capability, execution efficiency and the like.
Owner:CHINA PETROLEUM & CHEM CORP +1
Acoustic device for localized contactless measurement of elastic and dissipative non-linearities and viscoelasticity
InactiveCN102124328AAnalysing solids using sonic/ultrasonic/infrasonic wavesUltrasonic/sonic/infrasonic wave generationWave trainHydrostatic pressure
The invention relates to an acoustic method and device for localized, contactless, measurement of elastic and dissipative non-linearities and dynamic non-linear viscoelasticity in a medium subjected to a low-frequency acoustic stress and probed by ultrasonic pulses or wave trains. For this purpose, the invention relates to an acoustic, localized and contactless device for measuring elastic and dissipative nonlinearities and viscoelasticity of a specimen (2), characterized in that it comprises: means (10, 20, 22, 24) for transmitting a low-frequency acoustic wave (24a) and means (26, 34, 30) for receiving said low-frequency acoustic wave, which means are capable of creating a low-frequency periodic variation of the hydrostatic pressure in the specimen (2); means (10, 12, 14) for generating high-frequency ultrasonic pulses (14a) and means (16, 28, 30) for receiving said pulses; and an analysis unit (32) that includes a model for calculating the modulations in the time of flight and in the amplitude of the ultrasonic pulses (14a) that are induced by the low-frequency acoustic wave (24a) passing through the specimen (2), so as to quantify the elastic and dissipative non-linearities and the non-linear viscoelasticity of the specimen (2).
Owner:图尔大学附属医院
Acoustic logging first arrival pickup method
PendingCN112558159APlay a role in amplifyingStable and stableSeismic signal processingSeismology for water-loggingBandpass filteringWave train
The invention discloses an acoustic logging first arrival pickup method, which is characterized in that on the basis of acquired logging wave train data, on the basis of band-pass filtering and fuzzynested multistage median filtering denoising, a dynamic self-adaptive first arrival pickup range is solved through time difference obtained by an STC method, and acoustic wave first arrival is solvedby adopting a waveform envelope energy ratio method in the range. The method can accurately pick up the sound wave first arrival of the stratum with low signal-to-noise ratio and serious attenuation and the thin interbed and interlayer development stratum section.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
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