The invention discloses a corrected full-focus imaging method for anisotropy weld seam defect array detection and belongs to the field of nondestructive testing. The method comprises the steps of processing full-matrix data received by a one-dimensional linear array sensor of a phased array, taking material anisotropy into consideration, calculating out group velocity of ultrasonic waves in an anisotropy medium, then utilizing a ray tracing algorithm based on a Fermat principle to calculate out propagation time of the ultrasonic waves in the anisotropy medium and finally achieving full-focus imaging of anisotropy weld seams. The method has the advantages that weld seam anisotropy is taken into consideration, the high-operation-efficiency ray tracing method based on the Fermat principle and the full-focus imaging method are combined, the problem that general full-focus imaging has inaccuracy in locating defects in the anisotropy medium is solved, and meanwhile, detection precision of the phased array in the anisotropy medium is improved.

Corrected full-focus imaging method for anisotropy weld seam defect array detection

The invention discloses a real-time ultrasonic phased array total focusing imaging method The imaging method comprises the following steps: acquiring ultrasonic data of a target area in a full matrix capture manner by using an ultrasonic phased array probe; gridding an area range to be detected, acquiring a sonic path distance of sound waves emitted by every array element, returning to every array element, from the first point in the top left corner of grids and corresponding position information, and acquiring an index matrix; and establishing a GPU kernel function copy, and realizing real-time total focusing imaging according to the index matrix The method realizes real-time highly precise ultrasonic imaging and improves the resolution of images

Real-time ultrasonic phased array total focusing imaging method

The invention discloses a full-matrix data based ultrasonic all focusing and imaging system. According to the system, a detection system is established by taking an ultrasonic all focusing and imaging system as a base; corresponding parameters of an excitation signal and a receiving signal are set respectively, and excitation and receiving signal parameters are set according to an imaging region; an excitation delay parameter is set according to a wanted imaged type; and a sensor array is carried to collect full-matrix data, imaging parameters are set according to the full-matrix data to carry out all focusing and imaging on a detection region, and a detection result is intuitively expressed.

Full-matrix data based ultrasonic all focusing and imaging system

The embodiment of the invention discloses a real-time 3D full-focus phased array ultrasonic imaging method. The method comprises building a three-dimensional space rectangular coordinate system with the top surface of a workpiece to be tested, calculating launch time of ultrasonic wave, orderly transmitted by each array element of a two-dimensional area array transducer, transmitted from a coupledzone to a target defect point in a workpiece to be tested and reflection time of ultrasonic wave, reflected by the target defect point, transmitted from the workpiece to be tested to the coupled zoneand received by the two-dimensional area array transducer, building full-matrix data through the launch time and the reflection time and carrying out 3D full-focus reconstitution on the target defectpoint. The embodiment of the invention also discloses a device for real-time 3D full focus phased array ultrasonic imaging and a readable storage medium. The device collects the full-matrix waveformsignal of the three-dimensional space in the workpiece to be tested in real time, can carry out real-time 3D full-focus imaging detection, can produce visualized detection imaging results, has a fastdetection rate, produces a reliable detection result and realizes easy observation of damages.

Real-time 3D full-focus phased array ultrasonic imaging method and device and storage medium

The invention discloses an array ultrasonic focusing imaging correction method for a metal additive manufacturing heterogeneous structure. The method comprises the steps: constructing a space structure model of a heterogeneous medium; measuring elastic constants of a transverse isotropic structure; measuring five transverse isotropic elastic constants of the sample by using an X-ray diffraction calibration method to form an elastic matrix C; setting an initial angle of ultrasonic incidence at a first array element position of the array ultrasound; calculating a sound ray termination point F' of a focal plane in a forward direction; reversely calculating a sound ray termination point P' of an excitation position plane; circularly calculating acoustic propagation time between the excitationpoint and the focus point; calculating an array ultrasonic time delay matrix; and superposing the ultrasonic signals according to the delay matrix to obtain a corrected focusing image. Therefore, a problem that a traditional array ultrasonic focusing method fails due to signal phase distortion generated by an additive heterogeneous structure can be solved, and high-resolution imaging detection ofinternal defects of an additive workpiece is achieved.

Array ultrasonic focusing imaging correction method for metal additive manufacturing heterogeneous structure

The invention discloses a method for welding line ultrasound array full focusing imaging based on oblique incidence longitudinal waves. A present array imaging postprocessing method is only applied to processing of full matrix data collected under the situation that a phased array probe acoustic beam vertically enters a to-be-tested piece. According to the method, a wedge block is added to a phased array probe, a main acoustic beam of longitudinal waves enters a welding line of the to-be-tested piece through the wedge block; by processing the full matrix data excited and received by a phased array sensor and calculating a refraction intersection point of the acoustic beam on an interface through the wedge block based on a Snell principle, the acoustic beam propagation time of each array element reaching all imaging points is calculated, amplitudes of focus points are obtained through calculation, and then the amplitude of each focus point is focused; and finally full focusing imaging of the oblique incidence longitudinal waves is achieved. The longitudinal wave main acoustic beam in a specific direction can be generated, the defect detection effect in a welding line area and the defect recognition rate are improved; and a probe protecting effect is achieved.

Method for welding line ultrasound array full focusing imaging based on oblique incidence longitudinal waves

The invention discloses a service life assessment method for an ultra-high voltage grid GIS housing containing defects. Currently, a dedicated method for assessment on safety and service life of a GIS housing containing defects still lacks. The method comprises structural data acquisition of the ultra-high voltage grid GIS housing, defect feature acquisition of the ultra-high voltage grid GIS housing, defect expanding limit determination of the ultra-high voltage grid GIS housing, material and welded seam performance acquisition of the ultra-high voltage grid GIS housing, fatigue crack extended model establishment of the ultra-high voltage grid GIS housing, monitoring and extraction of working condition feature parameters of the ultra-high voltage grid GIS housing, and fatigue cycle number calculation of the ultra-high voltage grid GIS housing. Structure, defects, material performance and alternating working condition load of the ultra-high voltage grid GIS housing are taken into comprehensive account, and defect present situation and limit size, as well as load alternating features and crack expanding performance are thus obtained so as to precisely estimate fatigue service life of the ultra-high voltage grid GIS housing.

Qiao Min

Papers

Method for welding line ultrasound array full focusing imaging based on oblique incidence longitudinal waves

Service life assessment method for ultra-high voltage grid GIS housing containing defects