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Imaging method of wood radial section defects based on path group interpolation method

An imaging method and technology of radial sections, which are applied in analyzing materials, processing detection response signals, and using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as not being able to reflect radial defects inside trees well, and achieve imaging effects Good, fast imaging effect

Active Publication Date: 2019-11-08
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The purpose of the invention is to overcome the deficiency that the stress wave non-destructive testing technology in the prior art cannot reflect the radial defects inside the tree well, and to provide a path-based grouping interpolation that can quickly and accurately image the defects of the tree radial section Defect Imaging Method for Diameter Section of Wood

Method used

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  • Imaging method of wood radial section defects based on path group interpolation method
  • Imaging method of wood radial section defects based on path group interpolation method
  • Imaging method of wood radial section defects based on path group interpolation method

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[0118] The experiment uses such as figure 2 For the wood shown, the sensors are respectively placed on both sides of the tree. The right side is respectively No. 1-6 sensors from top to bottom, and the left side is respectively No. 7-12 sensors from bottom to top. The distance between each sensor on the left and right sides is 10cm;

[0119] During the experiment, each time the pulse hammer was used to hit the No. 1-12 sensors in turn, and the propagation time of the stress wave between each sensor was recorded. In order to ensure the accuracy of the data, each sensor was tapped three times to obtain the average time.

[0120] The specific experimental steps are as follows:

[0121] Step 1. Place the sensors on both sides of the tree. The right side is No. 1-6 from top to bottom, and the left side is No. 7-12 from bottom to top. Record the perimeter of the wood and the distance between the sensors. And the angle data between each other, input into the computer to form such...

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Abstract

The invention discloses a wooden radial section defect imaging method based on a path grouping interpolation method. The method comprises the following steps: (1-1) establishing a model of a wooden radial section; (1-2) measuring the propagation time of stress waves among sensors and calculating a propagation speed experiment value; (1-3) grouping propagation paths among the sensors according to angles; (1-4) sorting the propagation paths of the stress waves in each group according to the speed and calculating defect predicted values; (1-5) converting the defect predicted values corresponding to the propagation paths of the stress waves into defect predicted values of intersections; (1-6) solving defect predicted values of other points on the radial section by utilizing the defect predicted values and coordinates of the intersections; and (1-7) mapping the defect predicted values of all points resolved on the radial section onto different colors for imaging. The imaging method disclosed by the invention has the characteristics of excellent imaging effect and high imaging speed.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of wood, in particular to a method for imaging defects of radial section of trees based on path grouping interpolation method which can rapidly and accurately image defects of radial section of trees. Background technique [0002] With the development of computer technology, sensing technology and non-destructive testing technology, the detection technology of tree physical and mechanical properties and defects has also risen to a new level. The research on the imaging method of the radial section of wood has also gradually entered the field of vision of forestry researchers. [0003] The stress wave non-destructive testing technology in the prior art has the following disadvantages: the detection of the interior of the wood is mainly based on the cross section, which cannot well reflect the radial defects inside the tree, and cannot intuitively reflect the position and range of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/045G01N29/07G01N29/449G01N2291/0238
Inventor 冯海林郑泽宇方益明杜晓晨李剑
Owner ZHEJIANG FORESTRY UNIVERSITY