scispace - formally typeset
Search or ask a question
Patent

Defect two-dimensional morphology imaging detection method based on multi-mode acoustic beam synthetic aperture focusing

TL;DR: In this article, a defect two-dimensional morphology imaging detection method based on multi-mode acoustic beam synthetic aperture focusing, belonging to the technical field of nondestructive testing, is presented.
Abstract: The invention discloses a defect two-dimensional morphology imaging detection method based on multi-mode acoustic beam synthetic aperture focusing, belonging to the technical field of nondestructive testing. According to the method, a phased array ultrasonic detector, a phased array ultrasonic probe and a phased array ultrasonic detection system of an oblique wedge block are adopted; and signal acquisition of a detected test block is performed by the electronic scanning function of the phased array ultrasonic detector to obtain A-scanning signal of each aperture of the phased array ultrasonic probe. According to different mode conversion types of excitation acoustic beam of each aperture on the interface between the wedge block and test block, at the bottom of the test block and on the defect surface, proper multi-mode acoustic beam is selected from 8 acoustic beam transmission modes. Based on SAFT imaging principle and Fermat's theorem, the transmission delay of the multi-mode acoustic beam of each aperture is calculated, and amplitudes are overlapped to obtain a reconstructed SAFT image, thus realizing complete representation of defect two-dimensional morphology features. The invention can realize correct recognition of volume type and area type defects so as to realize accurate quantification of defect length, depth and orientation, and has relatively high engineering application value.
Citations
More filters
Patent
25 Jan 2019
TL;DR: In this article, a metallic molten pool internal contour online measurement device and method is presented, which consists of an excitation assembly, a receiving assembly and a computer for data analysis and control, and the computer is provided with a dynamic modulation module for dynamically modulating the beam.
Abstract: The invention discloses a metallic molten pool internal contour online measurement device and method. The device comprises an excitation assembly, a receiving assembly and a computer for data analysisand control; the excitation assembly comprises a laser, a beam splitter for dividing a beam emitted by the laser into a plurality of beams, and a plurality of sets of array optical fibers for receiving the plurality of beams respectively; and the computer is provided with a dynamic modulation module for dynamically modulating the beam. With the metallic molten pool internal contour online measurement device and method of the invention adopted, metallic molten pool internal contour online measurement can be realized based on a laser ultrasonic phased array detection technology; and a printingprocess can be adjusted according to a detection result, so that high manufacturing quality of parts can be realized.

4 citations

Patent
31 May 2019
TL;DR: An ultrasonic defect detection qualitative system and qualitative method that are implemented based on an ultrasonic phased array P-scan imaging device is presented in this paper, where the traditional ultrasonic detection equivalent method can be implemented and the structural defect like an object solder joint defect can be evaluated qualitatively byusing the P scanning imaging technique.
Abstract: The invention provides an ultrasonic defect detection qualitative system and qualitative method that are implemented based on an ultrasonic phased array P-scan imaging device. With the ultrasonic phased array P-scan imaging device, the traditional ultrasonic detection equivalent method can be implemented and the structural defect like an object solder joint defect can be evaluated qualitatively byusing the P scanning imaging technique. For example, for an object solder joint defect, the defect property can be determined by using the P-scan imaging technique based on the morphology features ofthe defect as well as the weld joint groove structure, welding method, and defect position; and thus the morphology of the object defect is reconstructed to achieve a corresponding ultrasonic qualitative detection objective.

2 citations

Patent
09 Apr 2019
TL;DR: In this article, a honeycomb sandwich structure detection method based on position-ultrasound signals is proposed, where inspectors can simultaneously observe the ultrasonic signals corresponding to each detection position point in each scanning row or column and the changes of ultrasonic signal on an instrument screen, and then the discrimination of defects and ultrasonic detection of the honeycomb structure can be carried out more intuitively according to the change of P(x,y)-A(t) signals displayed on the instrument screen.
Abstract: The invention belongs to the technical field of aviation and aerospace, transportation, construction, non-destructive detection and the like, and relates to a honeycomb sandwich structure detection method based on position-ultrasound signals. According to the honeycomb sandwich structure detection method proposed by the invention, inspectors can simultaneously observe the ultrasonic signals corresponding to each detection position point in each scanning row or column and the changes of the ultrasonic signals on an instrument screen, and then the discrimination of defects and the ultrasonic detection of the honeycomb structure can be carried out more intuitively according to the change of P(x,y)-A(t) signals displayed on the instrument screen. Since the inspectors can simultaneously observethe ultrasonic signals corresponding to each detection position point in each scanning row or column and the changes of the ultrasonic signals on the instrument screen, and then the discrimination ofthe defects and the ultrasonic detection of the honeycomb structure can be carried out more intuitively according to the change of the P(x,y)-A(t) signals displayed on the instrument screen, the difficulty of discriminating the defects is simplified, and thus the accuracy of defect discrimination is improved, the detection rate of the defects is improved, and the misjudgment rate of the defects is reduced.

1 citations

Patent
16 Oct 2018
TL;DR: In this paper, a fully-focused detection technology for coarse-grained material weld joints is proposed based on an M2M phased array ultrasonic flaw detector, which is used for non-destructive testing.
Abstract: The invention relates to technical field of non-destructive testing, in particular to a fully-focused detection technology used for coarse-grained material weld joints and based on an M2M phased arrayultrasonic flaw detector. The fully-focused detection technology includes: using the M2M phased array ultrasonic flaw detector as the detection instrument to form a rectangular scanning area on a to-be-detected workpiece, and allowing the scanning area to cover the weld joints and heat affected zone of the to-be-detected workpiece; using M2M instrument detection software to divide the weld jointsand heat affected zone of the to-be-detected workpiece into countless points, focusing each point, and collecting scanning data; using a scanning rack to detect the to-be-detected workpiece, collecting full-weld-joint scanning data, and performing quality evaluation according to related to standards. The detection technology has the advantages that the to-be-detected areas are divided into countless points by using a two-dimensional linear probe, focused detection is performed on each point, the detection sensitivity of the areas can be effectively increased, and effective detection of coarse-grained materials can be achieved; the M2M phased array ultrasonic flaw detector is used to perform optimal algorithm processing on the data, data quantity is reduced, and storage and on-site detection and analysis are facilitated.

1 citations

Patent
01 Oct 2020
TL;DR: In this article, a nature determination system and nature determination method for an ultrasonically detected defect, the system and method being implemented on the basis of an ultrasonic phased array P-scanning imaging apparatus.
Abstract: Disclosed are a nature determination system and nature determination method for an ultrasonically detected defect, the system and method being implemented on the basis of an ultrasonic phased array P-scanning imaging apparatus. By means of the ultrasonic phased array P-scanning imaging apparatus, a traditional ultrasonic detection equivalent method can be implemented, and a structural defect, such as a welding joint defect of an object, can be qualitatively evaluated by means of a P-scanning imaging technique. For example, for a welding joint defect of an object, the nature of the defect can be determined by means of the P-scanning imaging technique according to morphology features of the defect accompanied by a welding groove structure, a welding method, a defect position, etc., such that the morphology of the defect of the object is reconstructed and reproduced so as to achieve a corresponding aim, ultrasonic nature determination detection.
References
More filters
Patent
09 Nov 2016
TL;DR: In this article, an oblique incident ultrasonic synthetic aperture focusing-based thick wall structure defect detection method was proposed, which belongs to the technical field of nondestructive detection.
Abstract: The invention discloses an oblique incident ultrasonic synthetic aperture focusing-based thick wall structure defect detection method, and belongs to the technical field of nondestructive detection. The method comprises the following steps: a thick wall structure test block is detected through using a phased array electron scanning function by using an ultrasonic detection system comprising a phased array ultrasonic flaw detector, a phased array ultrasonic probe and an oblique organic glass wedge in order to obtain the A scanning signal set of all phased array elements; the Fermat's theorem is used to solve the emission point positions of all the phased array elements and image reconstruction points in the wedge/test block interface, and all A scanning signals undergo time delaying and amplitude superposing processing; and the processed A scanning signals undergo Hilbert transformation, and a difference function is used to obtain a reconstructed ultrasonic detection B scanning image. The method has the advantages of high defect detection resolution, large detection range, detection efficiency increase, and provision of an effective solving technology for the nondestructive detection problem of the defect of a thick wall structure. The method also can be embedded to the flaw detector to realize automatic real-time imaging, and has high engineering application values.

8 citations

Patent
23 Aug 2006
TL;DR: In this article, the authors determined the non-invasive readout of data of a passive strain sensor (1) which is covered by sound permeable material (12), by comparing the reflected echoes of the micro channel(s) with those of the calibration structure (2).
Abstract: The method is determined for the non-invasive read-out of data of a passive strain sensor (1) which is covered by sound permeable material (12). The sensor (1) consists of a flat housing incorporating one or more micro channels (3) filled with a strain-dependent quantity of fluid (6)/gas (5) and it comprises a calibration structure (2). A focused ultrasound beam is moved along predetermined paths in order to scan the entire sensor structure (1). The reflected ultrasound echo signals of all these paths are acquired. The echoes reflected by the micro channel(s) (3) and those reflected by the calibration structure (2) are then extracted. The obtained signals are then calibrated in order to compensate the influence of the material (12) between the ultrasound probe and the passive strain sensor (1), by comparing the reflected echoes of the micro channel(s) (3) with those of the calibration structure (2). The strain-depended fill level of the micro channel (3) is then determined based on a predetermined relation between the fill level and the micro channel's (3) reflected and calibrated sonic energy. The installation for executing the method comprises an ultrasonic transducer (16) connected to a pulser for generating a focused ultrasonic beam and a device, e.g. an XYZ scanner, which moves the focused ultrasonic beam along a predetermined path over the sensor (1) to be read out. Further, it comprises a flat sensor (1) built into sound permeable material (12), encompassing at least one micro channel (3) filled with a strain-dependent quantity of fluid (6)/gas (5), whereas this micro channel (3) laying on a plane parallel to the sensor's (1) surface (7) has an arbitrary shape, e.g. a spiral. Additionally, the sensor (1) includes at least one calibration structure (2) which is located in such a way, that its reflected ultrasound echoes are clearly separable from the ones reflected by the micro channel(s) (3). A receiver for the ultrasonic signals reflected by the micro channel(s) and the calibration structure is connected to a microprocessor (14) for further signal processing.

5 citations

Patent
09 Mar 2016
TL;DR: In this article, an image de-noising method for coarse austenite stainless steel welding line ultrasonic detection is presented, which belongs to the field of ultrasonic nondestructive detection.
Abstract: The invention discloses an image de-noising method for coarse austenite stainless steel welding line ultrasonic detection, and belongs to the field of ultrasonic nondestructive detection. The method comprises the following steps: at first, detecting a welding line by an ultrasonic detection system, which comprises a flaw detector, a probe, and a scanning apparatus, to obtain an ultrasonic image, outputting A scanning signal data that forms the ultrasonic image; then reconstructing the ultrasonic image through a signal time shifting and amplitude addition treatment; finally extracting the phase information of A scanning signal through Hilbert transform, establishing weight factors representing the phase position distribution of each point of the ultrasonic image on the basis of standard deviation of phase position, and amplifying the contribution of signal phase position distribution on flaw echo amplitude in the ultrasonic image to inhibit the noise amplitude of structure with randomly distributed phase positions. The provided method can be used to detect the ultrasonic defects of a coarse grain material and has a good application and promotion value.

4 citations