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A Measurement Method of Tree Trunk Profile Based on Laser Ranging Sensor

A technology of laser distance measurement and contour measurement, which is applied in the field of tree trunk contour measurement, can solve the problems of wood acoustic tomographic image deviation, complex tree growth process, etc., and achieve accurate and effective measurement, good measurement effect and high measurement efficiency.

Inactive Publication Date: 2018-11-20
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the growth process of trees is very complicated, and is greatly affected by factors such as the surrounding environment, light, and climate. Therefore, many tree trunks are not circular, especially for famous and ancient trees. As a result, the generated acoustic tomographic image of wood is different from the actual situation. large deviation

Method used

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  • A Measurement Method of Tree Trunk Profile Based on Laser Ranging Sensor
  • A Measurement Method of Tree Trunk Profile Based on Laser Ranging Sensor
  • A Measurement Method of Tree Trunk Profile Based on Laser Ranging Sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Measurements were taken on decayed log trunks on one side in the laboratory, and test samples such as Figure 8 As shown, when implementing this example, the side length L of an equilateral triangle is 50cm, and the step length l of one-dimensional scanning 0 is 1cm, measure the cross-sectional profile of the sample at a height of 10cm:

[0093] Step 1: Fix the support rod and the fixed rod around the trunk to be measured to form an equilateral triangle ΔABC;

[0094] Step 2: Fix the one-dimensional scanning system on the two support rods A and B, and measure the trunk profile of section A'B' through the keypad setting. Driven by the stepping motor, the laser ranging sensor moves from A to B along the sliding device. Move to B to realize one-dimensional scanning with a step size of 1cm, and obtain coordinate sequence data:

[0095]

[0096] Manually obtain the vertical distance y from two points A' and B' to the sliding device by using a square and a ruler A' and ...

Embodiment 2

[0114] Test another log sample in the laboratory, the test sample is as follows Figure 10 As shown, when implementing this example, the side length L of an equilateral triangle is 50cm, and the step length l of one-dimensional scanning 0 is 1cm, measure the cross-sectional profile of the sample at a height of 10cm:

[0115] Step 1: Fix the support rod and the fixed rod around the trunk to be measured to form an equilateral triangle ΔABC;

[0116] Step 2: Fix the one-dimensional scanning system on the two support rods A and B, and measure the trunk profile of section A'B' through the keypad setting. Driven by the stepping motor, the laser sensor moves from A to B along the sliding device Move to realize one-dimensional scanning with a step size of 1cm, and obtain coordinate sequence data:

[0117]

[0118] Manually obtain the vertical distance y from two points A' and B' to the sliding device by using a square and a ruler A' and y B' They are 10cm and 9.1cm respectively...

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Abstract

The invention discloses a laser distance measurement sensor-based tree trunk contour measuring method. The method is characterized in that the method includes the following steps that: an equilateral triangle ABC is set up around a tree trunk contour, and the tree trunk contour is located in the equilateral triangle ABC, and the length of the edges of the equilateral triangle ABC is set to L; the tree trunk contour is divided into three arcs by three median lines of the equilateral triangle ABC, wherein the three arcs are denoted as A'B', B'C' and C'A' respectively; a rectangular coordinate system xOy is built, the coordinates of the A'B' contour, B'C' contour and C'A' contour in the rectangular coordinate system xOy are measured respectively; and the measured coordinate values of the points on the tree trunk contour are transmitted to a PC, and the PC obtains a tree trunk contour image through adopting drawing software. With a tree trunk contour measuring system and the tree trunk contour measuring method provided by the invention adopted, the tree trunk contour can be accurately and effectively measured, and the tree trunk contour can be estimated accurately; measurement efficiency is high; and measurement effects are excellent.

Description

technical field [0001] The invention belongs to the technical field of tree trunk contour measurement, in particular to a tree trunk contour measurement method based on a laser ranging sensor. Background technique [0002] Wood acoustic tomography technology enables forestry production researchers to accurately obtain various information inside the wood without damaging the wood structure, so as to accurately and effectively evaluate the distribution of internal mechanical properties and the degree of decay of living logs and logs. At present, wood acoustic tomography technology has received extensive attention and has been successfully applied in the fields of wood internal defect detection, log sawing decision-making, and protection of famous and ancient trees. [0003] When using the acoustic wave propagation velocity to construct a wood tomography image, it is very important to accurately obtain the cross-sectional shape of the trunk. Although there are various wood acou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 方益明王泽润冯海林李剑李光辉
Owner ZHEJIANG FORESTRY UNIVERSITY
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