709 results about "Acoustic speed" patented technology

Aspects of this invention include a downhole tool having first and second radially offset ultrasonic standoff sensors and a controller including instructions to determine at least one of a drilling fluid acoustic velocity and a drilling fluid attenuation coefficient from the reflected waveforms received at the standoff sensors. The drilling fluid acoustic velocity may be determined via processing the time delay between arrivals of a predetermined wellbore reflection component at the first and second sensors. The drilling fluid attenuation coefficient may be determined via processing amplitudes of the predetermined wellbore reflection coefficients. The invention advantageously enables the acoustic velocity and attenuation coefficient of drilling fluid in the borehole annulus to be determined in substantially real-time.

Apparatus and methods for performing acoustical measurements are provided having some and preferably all of the following features: (1) the system is operated under near-field conditions; (2) the piezoelement or piezoelements used in the system are (a) mechanically and electrically damped and (b) efficiently electrically coupled to the signal processing components of the system; (3) each piezoelement used in the system includes an acoustical transformer for coupling the element to a gaseous test medium; (4) speed of sound is determined from the time difference between two detections of an acoustical pulse at a receiver; (5) cross-correlation techniques are employed to detect the acoustical pulse at the receiver; (6) fast Fourier transform techniques are used to implement the cross-correlation techniques; and (7) stray path signals through the body of the acoustic sensor are removed from detected signals prior to signal analysis. Techniques are also provided for performing acoustical measurements on gases whose thermodynamic properties have not been measures and on mixtures of compressible gases. Methods and apparatus for performing feedback control of a gas of interest in a mixture of that gas and a carrier gas are provided in which the controlled variable is the flow of the carrier gas.

The invention relates to a judging method of an incompactness defect in a node of a concrete structure by detection by an ultrasonic method. On the basis of the traditional method for detecting the concrete defect by the ultrasonic method, besides an acoustic velocity and a head wave amplitude, two variable acoustic parameters, namely a complex frequency difference and a cross-correlation coefficient, are added; each acoustic parameter is processed into an acoustic parameter judging factor and each acoustic parameter judging factor is processed into a normalized comprehensive acoustic parameter judging factor; a position detecting chromatogram is drawn out according to the comprehensive acoustic parameter judging factor; and the position and range of a suspicious defect are determined according to a red area in the chromatogram. By the method, the compactness quality distribution of concrete can be directly and accurately described; errors and judgment loss caused by adoption of a single acoustic parameter for judgment can be avoided or reduced; and the difficulty in final judgment when the judgment result of the single acoustic parameter is inconsistent is also avoided. The judging method can be widely applied to the judgment of the incompactness defect in the node of the concrete structure or other complex structures.

The invention discloses a method and a device for measuring accumulated liquid of a natural gas pipeline. The method comprises the following steps of: vertically transmitting high-frequency ultrasonic wave into the pipeline by an ultrasonic probe coupled to the outer wall of the measured pipeline, wherein the energy of reflection echo has great difference due to different properties of gas and liquid media; judging that the pipe inner wall is contacted with gas or liquid at the position of the probe according to the characteristic of echo received by the ultrasonic probe and reflected by the pipe inner wall; gradually adjusting the measurement position of the ultrasonic probe on the pipe outer wall along the circumferential direction; and recording a circumferential angle of the ultrasonic probe by a circumferential angle ruler when the echo has mutation, and further calculating the height of the accumulated liquid. The method is a non-intrusive accumulated liquid measurement method, does not change the structure of the conventional pipeline, has no medium leakage risk, does not affect the operation such as cleaning the pipeline and the like, meanwhile is not affected by the composition of gas and liquid phase media in the pipeline and parameters such as temperature, pressure and the like, overcomes the defect that the conventional ultrasonic technology needs complex sound velocity correction, and is particularly suitable for measuring the accumulated liquid inside the pipeline for conveying corrosive and toxic media.

A computer-readable software stored on a storage medium and executed on a computer to perform an integrated sonar simulation, includes a parameter definition code for defining a plurality of parameters of a sonar, target and sonar environment, and a SNR computation code for computing a SNR of the sonar as a function of range to target, based upon the parameters defined by the parameter definition code. The parameters defined by the parameter definition code include ambient noise, volume scattering strength of the sonar environment, sound velocity profile of the sonar, beam patterns of both projector and receiver of the sonar, type of sonar, range resolution of the sonar, number of eigenrays striking the surface and bottom of the sonar environment, number of eigenrays striking the target, ray trajectories to the target, and surface and bottom scattering strength as a function of angle. The software also includes a target strength model generating code for computing scattering from a selected complex target of a stored set of complex target selections, to thereby generate a target strength model for the selected complex target.

The invention relates to a foundation pile sound wave transmission method detection data comprehensive evaluation method, which is characterized in that (1), using dual-edge low-high value removing method to calculate sound parameter abnormal judgment critical value, comprehensively considering the normal ranges of the sound speed critical value and concrete sound speed of probability method, according to the bias degrees of the sound parameter detection value and the abnormal judgment critical value, making defect degree judgment standard, (2), using a sound test line to replace general test point to describe the sound parameters of sound wave transmission method, according to the physical character of different sound parameters and the data stability, making a standard for comprehensively evaluating the completeness classification of each sound test line in a detection section, (3), using the pile section as basic judgment unit to combine the completeness of each sound test line on the section to judge the completeness of each section, to evaluate completeness classification at the point of whole pile. The invention can effectively improve the objectiveness and scientific property of detection data analysis and processing, save material and human resource and improve significant social and economic benefits.

The invention relates to an ultrasonic testing method for steel pipe void, which comprises the following steps of: confirming a tested fracture surface of each steel pipe and arranging a plurality of survey lines on the surface of each steel pipe in a uniform distribution way; knocking each survey line on each fracture surface of arch ribs by a small hammer, preliminarily judging the compaction rate of concretes inside the steel pipe according to the knock, and recording judging results; measuring diameters of the survey lines on each fracture surface by using a tooling scale and recording; coating a coupling agent on the surface of each steel pipe, detecting each survey line by using an ultrasonic detector, and recording parameters of sound time, sound velocity, amplitude and wave form which are displayed in the detector; analyzing and calculating the recorded multi-group data to obtain the uniformity state of the concretes inside the steel pipes; if the uniformity state is favorable, then carrying out a quantitative calculation on inner pipe defects, and working out an inner pipe defect value of each fracture surface through a sound time value detected by the ultrasonic detector; and if the uniformity state is unfavorable, then obtaining a detection conclusion.

The method comprises: 1) selecting the type of the insulator; 2) measuring the sound speed; 3) selecting the probe; 4) crank detection; 5) automatically tracing; 6) comparing the wave forms; 7) displaying the detection result. By making the intellectualized modification for the original supersonic detector, the invention enhances the detection function and reduces the program for adjusting the metering device.

The invention discloses a surface acoustic wave transducer with a transverse mode suppression function and a preparation method thereof. The invention relates to the field of surface acoustic wave devices and manufacturing thereof. The structure comprises a piezoelectric substrate and an interdigital transducer arranged on the piezoelectric substrate. The interdigital transducer comprises a firstinterdigital electrode, a second interdigital electrode, a first bus bar and a second bus bar, wherein the first interdigital electrode and the second interdigital electrode are crossed. According tothe structure of the interdigital transducer, the interdigital transducer is further divided into an interdigital region, a first single-finger region and a second single-finger region; grooves are formed in interdigital gaps between adjacent interdigital electrodes in the interdigital region, and the grooves are located in the interdigital regions at the junctions of the interdigital region and the edges of the first single-finger region and the second single-finger region respectively; by forming the grooves, the sound velocity of the edge of the interdigital region of the surface acoustic wave transducer is lower than that of the center of the interdigital region, and the sound velocity of the first single-finger region and the second single-finger region is higher than that of the center of the interdigital region, so that the transverse wave mode of sound waves can be effectively inhibited; clutter response is inhibited; and the performance of the surface acoustic wave transduceris greatly improved.

A mixing portion that is formed in an area from a refrigerant injection port of a nozzle portion to an inlet section of a diffuser portion in an internal space of a body portion of an ejector and that mixes an injection refrigerant injected from the refrigerant injection port and a suction refrigerant suctioned from a refrigerant suction port is provided. A distance from the refrigerant injection port to the inlet section in the mixing portion is determined such that a flow velocity of the refrigerant flowing into the inlet section of the diffuser portion becomes lower than or equal to a two-phase sound velocity. A shock wave that is generated at a time that a mixed refrigerant is shifted from a supersonic velocity state to a subsonic velocity state is generated in the mixing portion, so as to stabilize pressure increasing performance in the diffuser portion.

The invention belongs to the technical field of acousto-optic detection, and in particular relates to a mixed gas temperature/concentration field measuring method and device based on acousto-optic fusion. The mixed gas temperature/concentration field measuring method comprises the following steps: according to a plurality of acoustic waves obtained through measurement and calculation, the acoustic speed of a laser path with fixed wave length during measurement area penetration, and a spectrum integral absorption rate, and with the combination of an index SVD inverse algorithm, confirming the acoustic speed and the spectral absorption coefficient distribution inside a gas two-dimensional area; by virtue of the function relationship between the acoustic speed and the spectral absorption coefficient and the temperature and the concentration of mixed gases, simultaneously reconstructing a temperature field and a concentration field of the mixed gases in the measurement area. According to the mixed gas temperature/concentration field measuring device, two acoustic wave frequencies with narrow bandwidth are adopted to measure the phase difference of transmitting-receiving signals, accurate measurement on the acoustic wave transmission time is achieved, and a fixed spectral integral absorption rate can be obtained according to the ratio of the laser intensity received by a detector and the intensity of incident laser of a collimator. The method and the device can be applied to multiple fields of industrial production and living, and particularly monitoring and control on the combustion process inside a furnace.

The invention discloses an ocean acoustic tomography method based on a time delay sensitive nucleus. First of all, a sending and receiving array is arranged at a sea area to be measured for obtaining measured acoustic signals, at the same time, model receiving signals are obtained by use of a prior acoustic velocity profile under a normal-mode model, afterwards, correlation-based waveform template coupling is performed on the model signals and the measured signals, and peak pairs and propagation delay inequalities are obtained; then an integration relation between the propagation delay inequality of each peak and two-dimensional acoustic velocity change is constructed by use of a propagation time delay sensitive nucleus method, and an acoustic tomography inverse medium problem model is established; and finally, an actual acoustic velocity is estimated through such inverse problem methods as a least square method with smooth constraints, a convex optimization method of sparse vectors and the like. According to the invention, simulation examples show that the time delay sensitive nucleus method provided by the invention can construct a two-dimensional acoustic speed profile of the sea area to be measured by use of propagation time delay information of the peaks and can achieve higher precision and resolution.

The invention discloses an underwater direction-of-arrival estimation method and device based on uniform linear arrays with an adjustable included angle. According to the invention, two uniform lineararrays with an adjustable included angle are adopted, the variable of sound velocity is eliminated through the relationship between an included angle of the two arrays and the direction-of-arrival angle, so that the final calculation result has nothing to do with the sound velocity, and in this way, the estimation accuracy is increased. At the same time, due to the variable included angle betweenthe two linear arrays, multiple measurements can be taken by taking different values, and errors can be better eliminated.

Disclosed herein is an ultrasonic diagnostic apparatus and ultrasonic image processing method. The ultrasonic diagnostic apparatus includes an ultrasonic transmission unit; An ultrasonic probe emits; An ultrasonic reception unit; An image processing unit; A sound velocity determination unit; and A control unit. Accordingly, there is an advantage in that the actual sound velocity of a reflected wave is estimated, so that high-quality ultrasonic images can be provided, and the time required for the estimation of a sound velocity can be reduced.