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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  • 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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  • Concrete ultrasound tomography algorithm
  • Concrete ultrasound tomography algorithm
  • Concrete ultrasound tomography algorithm

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Refer to image 3 As shown, the measurement area is a rectangular area of ​​100cm×60cm, divided into 10×6 grids (imaging units), all of which are 10cm×10cm in size. The grids are numbered in the order from bottom to top and left to right , Among which Nos. 22, 23, 28, 29, 34, 35 are defective cells, the defect wave speed is 4050m / s, and the normal wave speed is 4500m / s. Transmitting and receiving transducers are arranged on both sides of the length direction.

[0072] Refer to Figure 4 As shown in ac, the ART algorithm is used to iterate 100 times and the probability ART algorithm is iterated 50 times. The calculation results are 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 meters. In meters, the z-axis represents wave speed, and the unit is meters / second. It can be seen that the calculation result of the probabilistic ART algorithm is closer to the compute...

Embodiment 2

[0075] A concrete specimen is used for the simulation test. The section of the specimen is 44cm long and 50cm deep, divided into 11×10 grids. Among them, the center part is a defect (concrete with mud), the size is 15×15cm, respectively in the length direction Transmitting and receiving transducers are arranged on both sides of the, and when 11×11 sounds are obtained, the ART algorithm and the probabilistic ART algorithm are used to inverse respectively, and the cross-sectional wave velocity distribution obtained is shown in the attached file. Figure 5 And Figure 6 Shown.

[0076] Refer to Figure 5 As shown, the cross-sectional imaging of the traditional ART algorithm is somewhat deviated, and two defect areas appear in the center of the specimen, which is not consistent with a uniform defect in the center of the concrete specimen.

[0077] Refer to Figure 6 As shown, the imaging quality of the probabilistic ART algorithm is greatly improved, and the position and shape of the de...

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Abstract

The disclosed concrete ultrasonic chromatography imaging algorithm comprises: providing a probabilistic ART algorithm for real-time 2D inversion imaging; wherein, preliminary determining the probability of ray to pass through the defect unit according to the projection value of every ray; then further determining the probability of every mesh as a defect unit to select the initial iterative value for ART algorithm; assigning the projection error during the iteration till stop. 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 concrete ultrasonic non-destructive testing, and particularly relates to a concrete ultrasonic tomographic imaging algorithm. technical background [0002] Computerized Tomography (Computerized Tomography) uses a certain kind of ray source under the condition of not damaging the internal structure of the "object", according to the projection data obtained from the detection equipment outside the "object", in accordance with certain physical and mathematical relationships, The computer is used to invert the distribution of a certain unknown physical quantity inside the "object" to generate two-dimensional and three-dimensional images to reproduce the internal characteristics of the "object". The main goal of tomography technology applied to nondestructive testing of concrete is to determine the fine structure and local unevenness of the interior of the building without damaging the internal structure of the concrete. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44G01N29/07G06F17/00
Inventor 赵祥模宋焕生徐志刚关可沈波戚秀真李娜
Owner CHANGAN UNIV
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