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Concrete ultrasound tomography algorithm

An ultrasonic tomography and concrete technology, which is used in the analysis of solids using sonic/ultrasonic/infrasonic waves, calculations, special data processing applications, etc.

Inactive Publication Date: 2007-02-07
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ART algorithm has been continuously improved. Although the simulation results and experimental results are valid, the accuracy and speed of image reconstruction are still not well resolved.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to image 3 As shown, the measurement area is a rectangular area of ​​100cm×60cm, which is divided into 10×6 grids (imaging units), each of which is 10cm×10cm in size, and the grids are numbered in sequence from bottom to top and from left to right , of which Nos. 22, 23, 28, 29, 34, and 35 are defect cells, the defect wave velocity is 4050m / s, and the normal wave velocity is 4500m / s, and the transmitting and receiving transducers are arranged on both sides of the length direction.

[0036] refer to Figure 4 As shown in a-c, the ART algorithm is used to iterate 100 times and the tower-type ART algorithm is used for inversion. The comparison of the calculation results is shown in Table 1. In the figure, the x-axis represents the length of the survey area in meters, and the y-axis represents the width of the survey area in units of The z-axis represents the wave speed, and the unit is m / s. It can be seen that the tower-type ART algorithm weakens the influence of ...

Embodiment 2

[0039] Concrete specimens were used for simulation tests. The section measuring area of ​​the specimens was 44cm long and 50cm deep, and was divided into 11×10 grids. Transmitting and receiving transducers are arranged on both sides of the , and 11×11 sound hours are obtained, and the ART algorithm and the tower ART algorithm are used for inversion respectively. The obtained cross-sectional wave velocity distribution is shown in the attached Figure 5 And attached Figure 6 shown.

[0040] refer to Figure 5 As shown, the cross-sectional imaging of the traditional ART algorithm deviates, and two defect areas appear in the center of the specimen, which is inconsistent with a uniform defect in the center of the concrete specimen.

[0041] refer to Figure 6 As shown, the imaging quality of the tower ART algorithm has improved, and the defect position is more prominent, but it cannot accurately reflect the defect shape.

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Abstract

The disclosed concrete ultrasonic chromatography imaging algorithm comprises: providing a tower ART algorithm to gradual divide the mesh and combine with the algorithm; using the last mesh wave slowness to endow the next one; recalculating the ray length past through the mesh unit, modifying the wave slowness value; continuing to divide mesh till the mesh unit can not be less than the imaging unit. This invention can improve computation precision and image reconstruction quality to efficient take inversion the inner strength distribution and defect position and size for concrete.

Description

technical field [0001] The invention belongs to the field of ultrasonic non-destructive testing of concrete, in particular to a concrete ultrasonic tomography algorithm. technical background [0002] Tomography (Computerized Tomography) is the use of a certain ray source under the condition of not damaging the internal structure of the "object", according to the projection data obtained from the external detection equipment of the "object", according to certain physical and mathematical relationships, Use the computer to invert the distribution of some unknown physical quantity inside the "object", generate two-dimensional and three-dimensional images, and reproduce the internal characteristics of the "object". The main goal of tomography in the non-destructive testing of concrete is to determine the fine structure and local inhomogeneity inside the building without damaging the internal structure of the concrete. [0003] At present, the commonly used ray tomography invers...

Claims

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Application Information

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IPC IPC(8): G01N29/44G01N29/07G06F17/00
Inventor 赵祥模宋焕生关可徐志刚沈波李娜戚秀真
Owner CHANGAN UNIV
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