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A method for measuring the deformation of wood veneer based on 3D laser scanning

A technology of wood veneer and three-dimensional laser, which is applied in the direction of measuring devices, optical devices, instruments, etc., to achieve the effect of ensuring accuracy and realizing visualization

Inactive Publication Date: 2020-02-14
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects existing in the traditional wood veneer deformation degree measurement, the present invention provides a wood veneer deformation measurement method based on three-dimensional laser scanning

Method used

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  • A method for measuring the deformation of wood veneer based on 3D laser scanning
  • A method for measuring the deformation of wood veneer based on 3D laser scanning
  • A method for measuring the deformation of wood veneer based on 3D laser scanning

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Embodiment

[0054] Such as figure 2 As shown, Zhongshan fir rotary-cut veneer is used as the test object in this embodiment, Zhongshan fir log is cut into 1.3m, peeled, and the moisture content of the raw material is about 146%. The nominal thickness of the veneer is 2mm. In the log rotary cutting process, randomly select a number of 1270mm×870mm veneers at diameters of 300mm-280mm, 150mm-130mm, and 80mm-50mm, cut them into 400mm×400mm test pieces, and mark them as Class A and Class B from the outside to the inside. Class, Class C. Drying in the natural state, the drying deformation in the natural state, the moisture content of the veneer measured before the test is 18%.

[0055] Such as image 3 As shown, on the back of the veneer, the four corners and four sides of the veneer are evenly distributed every 100mm in diameter, and special reflective spots with a reflective diameter of 6mm are distributed in a grid. Use a non-contact 3D laser scanner to scan the deformed veneer. The non...

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Abstract

The invention discloses a wood veneer deformation measuring method based on three-dimensional laser scanning, which comprises the following steps: (1) arranging positioning marking points on the backside of a deformed wood veneer, and using a non-contact three-dimensional laser scanner to scan the deformed wood veneer; (2) using matched scanning software to perform point cloud noise processing, island removing, trimming and other editing operations on an obtained three-dimensional mesh to obtain a visualized deformed wood veneer model; (3) recording the three-dimensional coordinates of the positioning marking points using the scanning software; (4) using a three-dimensional graphic geometric transformation matrix to process the three-dimensional coordinates of the positioning marking points; (5) constructing a curved surface using a triangulation method of scattered data points; (6) using the modified coordinates of the positioning marking points to limit the boundary of the constructed curved surface, and establishing a contour map of the deformed veneer; and (7) obtaining deformation data of a tested veneer according to a deformation evaluation index of the wood veneer. The method can measure the deformation of the wood veneer in a visual, rapid and precise manner.

Description

technical field [0001] The invention relates to a method for measuring deformation of wood veneers based on three-dimensional laser scanning, which belongs to the field of wood detection science and technology. Background technique [0002] The size of the deformation of the wood veneer has a great influence on the drying process and processing technology of the wood veneer. The traditional measurement of the deformation degree of the wood veneer is to measure the surface and plane of the veneer. The ratio of the maximum deviation height to the width of the tested veneer, because the deformation of the veneer is not uniform, the size of the deformation is different in each position of the veneer, this test method can only be carried out on the edge of the veneer For measurement, the overall deformation of the veneer cannot be measured, and a steel ruler is used as a measuring tool to directly contact the veneer under test, and there is interference from external forces. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 朱越骅潘彪张耀丽
Owner NANJING FORESTRY UNIV
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