31 results about "Scattering attenuation" patented technology

A system and methods for characterizing an inspected object on the basis of attenuation determined from pair-wise illuminated voxels. A beam of penetrating radiation characterized by a propagation direction and an energy distribution is scanned relative to an object, while scatter detectors with collimated fields-of-view detect radiation scattered by each voxel of the inspected object that is intercepted by the incident beam of penetrating radiation. By calculating the attenuation of penetrating radiation between pairs of voxels illuminated sequentially by the incident beam, a tomographic image is obtained characterizing the three-dimensional distribution of attenuation in the object of one or more energies of penetrating radiation, and thus of various material characteristics.

The invention provides a method and device for quantitatively evaluating the stratum heterogeneity, and belongs to the field of oil and gas resource exploration. The method comprises the steps that waveform data in a depth interval is obtained; depth correction is conducted, a waveform coherent stacking method is utilized for treatment, and the longitudinal wave speed and transverse wave speed ofa stratum are obtained; a scattering attenuation quality factor and center frequency of the waveform data are calculated; the average longitudinal wave speed, the transverse wave speed and the disturbance quantity of the transverse wave speed are obtained; a random medium model is built; different correlation distances are selected, corresponding characteristics of a sound field of the random medium model are simulated by means of a finite-difference time-domain value, and scattering attenuation quality factors of the random medium model under the different correlation distances are calculated; a scattering attenuation quality factor chart of the random medium model is built; a measured data scattering attenuation quality factor is compared with the scattering attenuation quality factor chart, and the correlation distance of the depth interval is obtained. Accordingly, by adopting the correlation distance of rock, the heterogeneity of the rock is quantitatively evaluated.

The invention discloses a rock scattering attenuation calculation method using multi-parameter integrated inversion; the method comprises the following steps: carrying out array acoustic logging in a depth section, thus obtaining dipole array waveform data in the depth section; calculating a power spectrum of each depth point actual measuring waveform; building inversion objective functions; using the least squares to obtain the scattering attenuation of each depth point; loop executing step 2 to step 4, thus finally obtaining the scattering attenuation curve of the depth section. The method can accurately parse the acoustic logging data and extract scattering attenuation of elastic waves, thus providing valuable stratum information; compared with the large scale seismic wave scattering attenuation, the acoustic logging calculated scattering attenuation can provide the underground rock small scale heterogeneity information.

The invention discloses a high-energy laser homogenizing cavity attenuator which comprises a front panel, a small-hole sample plate, an attenuation plate, an output panel and a plurality of scattering attenuation units. Each attenuation unit includes a large-angle sampling taper hole arranged on the small-hole sample plate, a homogenizing cavity and a light transmission channel which are arranged on the attenuation plate, and a homogenizing cavity and a laser output hole which are arranged on the output panel, wherein the light transmission channel is of a circular symmetric structure, which enables the angle characteristic of the attenuator to have circular symmetry. The attenuator has a multi-layer plate structure, which can effectively reduce the influence of high temperature generated due to long-time irradiation of high-energy laser on the front panel to a subsequent measurement unit. According to the attenuator of the invention, laser is output from the output hole after being homogenized for multiple times, substantial attenuation of the laser power density is achieved, and the attenuator has better attenuation angle characteristics.

Methods for characterizing an inspected object on the basis of attenuation determined from pair-wise illuminated voxels. A beam of penetrating radiation characterized by a propagation direction and an energy distribution is scanned across an object, while scatter detectors with collimated fields-of-view detect radiation scattered by each voxel of the inspected object that is intercepted by the incident beam of penetrating radiation. By calculating the attenuation of penetrating radiation between pairs of voxels of incidence of the incident beam, a tomographic image is obtained characterizing the three-dimensional distribution of attenuation in the object of one or more energies of penetrating radiation, and thus of various material characteristics.

An infrared broadband transmission type plastic film thickness measuring device and an infrared broadband transmission type plastic film thickness measuring method belong to the technical field of infrared transmission measurement of plastic film thickness and solve the problems that the existing infrared transmission thickness measuring methods are poor in accuracy and universality. The measuring device comprises a broadband infrared source, a thermopile detector, a signal processing unit and an industrial personal computer. The measuring method includes: emergent light from the broadband infrared source is absorbed by a measured plastic film and scattered and attenuated prior to being received by the thermopile detector, received optical signals are converted into electrical signals by the thermopile detector, the electrical signals are then outputted to the signal processing unit, the signal processing unit calculates to obtain optical power information according to the received electrical signals, the optical power information is transmitted to the industrial personal computer through a serial communication port, and the industrial personal computer calculates to obtain the thickness value of the measured plastic film. The infrared broadband transmission type plastic film thickness measuring device and the infrared broadband transmission type plastic film thickness measuring method are applicable to measurement of thickness of plastic films.

The invention discloses an on-line measurement method for sweep-frequency ultrasonic focusing type sediment grain size distribution. The method includes the steps: establishing a measurement device taking a focusing type ultrasonic probe as a core, and configuring sediment samples of different grain sizes by the aid of a sieving method and a microscopic method; debugging a measurement system, and starting the measurement device after the measurement system is accurately debugged; changing ultrasonic frequencies, and performing a series of tests taking sediment grain sizes as variables under different ultrasonic frequencies to obtain data of receiving waveforms; performing phase space division and symbolic dynamic filtering based on Hilbert transform for acquired signals to obtain parameter value measures related to the grain sizes; performing data fitting for the measures under different frequencies and scatter diagrams of the sediment grain sizes to obtain sediment grain size measurement models. According to the method, scattering attenuation in the propagation process can be effectively reduced, acceptable sound energy at a receiving transducer is improved, and signal-to-noise ratio and sensitivity and measurement accuracy of a whole measurement system are improved.

The invention provides a flame light field probe pan-scale analysis method based on a micro-lens array. The flame light field probe pan-scale analysis method comprises high temperature dispersion dielectric optical radiation modeling, high temperature dispersion dielectric radiation characteristic calculation, light tracking algorithm based on Monte Carlo algorithm, object image refocusing algorithm and the like. By simulating that light of different wavelengths is emitted from the inside of a medium and subjected to medium absorption, scattering attenuation, medium emission, scattering enhancement and the like, the simulating calculation of the micro-lens light field imaging of a high temperature flame is performed. Through the simulating calculation, the temperature field of the high temperature flame can be reconstructed, and a theoretical basis is provided for calibration, measurement and the like of a light field camera.

An energy degrading device for attenuating energy of a particle beam with reduced emittance growth. An energy degrader comprises an emittance control material that can preferentially scatter the beam particles that is incident on a surface with a shallow angle. In one approach, the energy degrader may include alternating layers of a low-Z and a high-Z material, wherein the low Z material serves to attenuate energy of the beam particles by virtue of scattering and the high Z material serves to suppress the emittance increase by scattering back the beam particles toward the beam axis. In another approach, the energy degrader may be composed of carbon nanotubes or a material with oriented crystalline structure that is substantially orientated in the incident direction of the particle beam. The carbon nanotubes may serve to preferentially scatter beam particles towards the central beam axis as well as attenuate energy thereof.

An ultrasonic measurement apparatus extracts, from a reception signal, a plurality of partial reception signals according to overlap periods that are set by shifting the time so as to overlap partially. Then, scattering attenuation correction using a scattering attenuation correction value is performed for a frequency domain signal obtained by performing a Fourier transform of each of the plurality of partial reception signals, and an inverse Fourier transform of a corrected frequency correction signal is performed. Then, partial correction signals corresponding to the respective partial reception signals are obtained by performing an inverse Fourier transform. Then, a signal obtained by combining the partial correction signals is set as a reception correction signal after correcting the reception signal. The scattering attenuation correction value is calculated from the signal strength of incident ultrasonic waves and a sum value of the signal strength of the reception signal at each time.

The invention relates to a high-pressure medium seismic wave propagation simulation method, comprising the following steps: 1) establishing a novel acoustic elasticity formula combined with pore structural parameters; 2) calculating equivalent elastic moduli and elastic wave velocities in different pressure states by utilizing the novel acoustic elasticity formula; 3) extracting structured data, namely autocorrelation length, among particles inside rocks; 4) specific to each pressure state, taking the equivalent elastic moduli obtained by the step 2) as background values of rock medium elasticmoduli respectively, and according the autocorrelation length extracted in the step 3), by combining an autocorrelation function, adding elastic modulus disturbance in the background values, and building a rock numerical value model in each pressure state; and 5) performing finite element seismic wave field simulation in each rock numerical value model, and extracting a scattering attenuation Qc-1 value of a reservoir specific to characteristics of a deep reservoir, wherein Qc-1 is a coda wave attenuation coefficient.

The invention discloses a grouting sleeve grouting defect detection method based on sound wave local resonance scattering characteristics, which comprises the following steps: carrying out sound wavedetection outside a to-be-detected part on the same side of a grouting sleeve, and carrying out data processing on an obtained original echo signal to obtain a pulse upper envelope diagram; and extracting a sound wave local resonance scattering attenuation characteristic parameter alpha after data formula fitting, so that whether void or void exists in the sleeve or not is judged. Compared with the prior art, the detection method provided by the invention has the advantages that the process is simple, the labor intensity of workers is effectively reduced, the personnel allocation amount is reduced, the tedious working process is reduced, the detection method is different from the traditional detection of void sound velocity and sound time angle, the detection is carried out from the perspective of energy attenuation, and the measurement accuracy can be improved.

The invention relates to an automatic detection method for gluing, which is applied to glue detection in industrial products and comprises the following steps: emitting detection waves and receiving echo signals; performing data processing on the echo signal, and comparing the echo signal with a preset threshold value; and the comparison result is transmitted to the industrial controller. According to the technical scheme provided by the invention, the transmitted ultrasonic waves penetrate through the measured objects, the ultrasonic waves can be reflected when penetrating through substances with different impedances due to different materials and different impedances of the measured objects, the scattering attenuation and the absorption attenuation of glue are far greater than those of steel, and the echo attenuation speeds are obviously different. Signal emission and recovery are carried out through the ultrasonic probe, data processing is carried out on echo signals, the echo signals are compared with a preset threshold value, whether gluing sequence jumping occurs or not is judged by detecting the echo attenuation rate, and targeted detection on glue is achieved.

The invention provides a method and a system for identifying non-uniform anisotropy of the peripheral rock. The method is characterized in that the sound wave logging is carried out in a depth interval, and the orthogonal dipole four-component display waveform data in the depth interval is obtained; the scattering attenuation quality factors of the sound wave signals are used for identifying the uniform anisotropy of the rock, and the result of the non-uniform anisotropy of the rock can be used for guiding oil gas development, and important information is provided for exploration, mining and production of oil gas.

The invention provides a marine surveying and mapping underwater target three-dimensional visualization processing system, which comprises a multi-beam sounding system, a side-scan sonar system, a GPS system, an information processing device, a wireless transmitting device and a land receiving end, and is characterized in that the multi-beam sounding system and the side-scan sonar system can effectively measure the submarine topography and the shape of an underwater target; the land receiving end matches data sent by the multi-beam sounding system and the side-scan sonar system with physical properties (including but not limited to salinity and temperature of seawater) of seawater in the area, and reduces deviation of seawater topographic data through a seawater scattering attenuation formula. Data sent by the multi-beam sounding system and the side-scan sonar system are in one-to-one correspondence with GPS information, submarine topographies and underwater target conditions at different positions can be effectively obtained, and more accurate topographic information can be effectively obtained through matching calculation of the data and physical properties of seawater in the area.