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Tree defect detection device and detection method

A defect detection and detection method technology, which is applied in measuring devices, instruments, analysis of solids using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as inability to accurately detect internal defects in wood and incomplete detection methods, and achieve strong promotion and application. Value, suitable for promotion, high detection accuracy

Active Publication Date: 2019-04-23
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the detection method in the prior art that the detection method is not comprehensive and cannot accurately detect the internal defects of wood, and provides a tree defect detection device and detection method with high detection accuracy and easy operation

Method used

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  • Tree defect detection device and detection method
  • Tree defect detection device and detection method
  • Tree defect detection device and detection method

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example

[0069] The experiment uses such as image 3 As shown in the cedar, a longitudinal section with an angle of 15° to the radial section is detected, and 6 stress wave sensors are arranged on both sides of the section. The distance between each sensor on one side is 10cm, and the sensor numbers are 1-12;

[0070] During the experiment, a pulse hammer was used to strike from No. 1 to No. 12 in sequence, and the propagation time of the stress wave between each sensor was recorded. Six longitudinal sections with different angles α, including the radial section, were tested in a single experiment. The included angles α are 0°, 15°, 30°, 45°, 60°, and 75°, respectively. By analyzing the stress wave propagation velocity on the longitudinal section of six different section angles α, we can know the internal defects of wood in the longitudinal direction, such as defect position, size and shape. The specific experimental steps are as follows:

[0071] Step 1: Carry out 6 times of fixed ...

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Abstract

The invention discloses a tree defect detection device and a detection method. The detection method disclosed by the invention comprises the steps of obtaining stress wave theoretical propagation velocity in a longitudinal section through a mathematic model, then obtaining stress wave theoretical propagation velocity in sample wood through an experiment, comparing the stress wave theoretical propagation velocity in the longitudinal section with the stress wave theoretical propagation velocity in the sample wood, marking abnormal paths, finding out defect positions and determining defect size. The detection method disclosed by the invention has the characteristics of high detection accuracy and high practicability.

Description

technical field [0001] The invention belongs to the field of non-destructive detection of wood, and relates to a tree defect detection device and detection method with high detection accuracy and easy operation. 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. Due to the economy and convenience of stress wave non-destructive testing technology, it has been widely concerned by forestry researchers and industry. [0003] The stress wave non-destructive testing technology in the prior art has the following disadvantages: the internal detection of the wood is mainly based on the cross section, the detection is not comprehensive, and the internal defects of the wood cannot be accurately detected. Contents of the invention [0004] The purpose of the present invention is to overcome th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/07
CPCG01N29/045G01N29/07G01N2291/0238G01N2291/0289G01N2291/2626
Inventor 冯海林张春晓方益明李剑李光辉
Owner ZHEJIANG FORESTRY UNIVERSITY
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