Ultrasonic nondestructive testing method based on travel time tomography and reverse time migration imaging
A technology of reverse time migration imaging and travel time tomography, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measurement devices, which can solve the problems of high-speed area aggregation and rarely involve , can not be reflected and other problems, to achieve the effect of broad application prospects, high accuracy and strong practicability
Active Publication Date: 2020-02-07
XIAMEN UNIV
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However, traditional ultrasonic nondestructive testing technologies such as those based on time-frequency analysis technology can only qualitatively analyze whether there are defects and the approximate area where defects may exist, and cannot quantitatively analyze the shape and size of defects and accurately image defects
[0003] Travel time tomography (Travel time Tomography) is an imaging method that inverts and calculates the regional velocity distribution by extracting the first arrival time. It is considered to be an effective method for reconstructing near-surface models and is widely used. It is generally used in wells In seismic exploration, the defect detection of concrete and wood is rarely involved
At the same time, the travel-time tomography based on ray tracing theory is a mathematical abstraction for the linear integral between the slowness along the shot point and the geophone, which cannot reflect the real physical motion process, so low-speed body deviation and high-speed area aggregation will occur situation, which has a great impact on the resolution of tomographic imaging
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[0045] Such as figure 1 As shown, the present invention is based on the ultrasonic nondestructive testing method of travel time tomography and reverse time migration imaging, which specifically includes the following steps:
[0046] Step 1. Set multiple sets of ultrasonic excitation sources and detectors around the structure to be tested, and excite ultrasonic signals at the location of the excitation source, and collect ultrasonic transmission signals at the location of the detector;
[0047] Step 2. Extract the arrival time t of the first wave of each ultrasonic transmission signal mea ;
[0048] Step 3, if figure 2 As shown in , the cross-sectional area of the structure is divided into discrete grids, numbered in a certain order, and the initial supersonic velocity in each grid is set to obtain an initial slowness model s 0 , using the relationship between travel time and slowness, the location of the detector and excitation source, and the first arrival travel time t...
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The invention relates to an ultrasonic nondestructive testing method based on travel time tomography and reverse time migration imaging. The method includes: acquiring ultrasonic velocity distribution within a to-be-tested structure section by travel time tomography technique, taking the ultrasonic velocity distribution as an initial velocity model of reverse time migration imaging, and then employing reverse time migration imaging technique for imaging the internal defect of the to-be-tested structure. The method provided by the invention can achieve high resolution imaging of concrete internal voids, concrete-filled steel tube stripping and other defects so as to acquire the position, size, shape and other information of the defects, and has broad practical application prospects.
Description
technical field [0001] The invention relates to the technical field of ultrasonic nondestructive testing, in particular to an ultrasonic nondestructive testing method based on travel time tomography and reverse time migration imaging. Background technique [0002] In the field of non-destructive testing, ultrasonic non-destructive testing technology has developed rapidly due to its advantages of wide range of detection objects, harmless to human body and low cost. It is a technology that uses ultrasonic waves to detect the performance, quality and defects in objects without destroying or damaging the objects. It is now widely used in many industrial sectors, such as the steel industry and machine manufacturing. Industry-related industrial sectors, high-speed developing new technology industries such as integrated circuit industry and other industrial sectors. At present, it is widely used in the detection of materials and components, such as concrete detection, wood detecti...
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IPC IPC(8): G01N29/06
CPCG01N29/0672G01N29/069G01N2291/0232G01N2291/0234
Inventor 刘海夏蕙琰庄明伟龙志军韩峰柳清伙
Owner XIAMEN UNIV