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Method for measuring density of Huoli Wood using near infrared spectrum

A technology of near-infrared spectroscopy and living standing wood, which is applied in the field of measuring the basic density of living standing wood by using near-infrared spectroscopy, and can solve problems such as distortion of wood density measurement results.

Inactive Publication Date: 2007-03-28
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of distortion of wood density measurement results due to high moisture content, and provide a method for measuring the density of live standing trees with near-infrared spectroscopy. The method of establishing a density correction model in the moisture content interval can effectively reduce the influence of moisture on the prediction of the density of standing wood by near-infrared spectroscopy, and can give full play to the advantages of fast analysis of near-infrared, so as to realize the rapid determination of the density of standing wood

Method used

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Embodiment Construction

[0019] Typical embodiment of the present invention measures the method for live standing timber timber density:

[0020] (1) Sample selection, collect the growth cone wood core from the chest height (1.3 meters) of the standing timber, process it into a round wood block with a thickness of 5mm and a diameter of 12mm, and select no less than 120 non-defective wood samples;

[0021] (2) Collect near-infrared spectrum, control the sample temperature at 20-25°C, within the range of the full spectrum (wavelength 350-2500nm (nanometer)), divide it into five different moisture content intervals, and collect the diffuse reflection near-infrared of wood respectively Spectrum, the five water content intervals are ①3-30%; ②30-80%; ③80-130%; ④130-200%; ⑤200-300%;

[0022] (3) adopt the above-mentioned drainage method to measure the wood density of the sample, measure the volume when the sample is saturated with the drainage method, measure the absolute dry weight of the sample with the dr...

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Abstract

This invention relates to a method for testing density of alive stumpage wood with near infrared spectrum including: selecting not less than 120 bug-free wood samples, controlling the temperature of the samples at 20-25deg.C, dividing them into five regions of moisture rate of 3-30%, 30-80%, 80-30%, 130-200%, 200-300% and collecting the diffuse reflection near infrared spectrums of the woods, applying a water discharge method to test the volume when the sample is full of water, applying a drying method to test the absolute weight of the sample to compute the water ratio and density of the woods, setting up a pretest model of moisture, setting up density correction models separately for five regions of water rate and utilizing the set-up models to analyze the density of unknown samples.

Description

technical field [0001] The invention relates to a method for measuring the density of standing trees by using near-infrared spectroscopy, more specifically, a method for measuring the basic density of standing trees by using near-infrared spectroscopy. Background technique [0002] Density is the most important single property of wood, and its mechanical properties, hardness, abrasion resistance, wood calorific value and pulp yield are all closely related to wood density. The rapid and accurate prediction of standing tree timber density is of great significance to forest tree cultivation, forest tree quality evaluation, timber trade and timber processing and utilization. [0003] Usually, the method of measuring the density of living standing wood is to use the drainage method to measure the volume of the sample when the sample is soaked to a saturated state; volume in water to obtain the wood density. This method is very time-consuming, because it takes a long time for th...

Claims

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Application Information

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IPC IPC(8): G01N9/24G01N21/49G01N5/04
Inventor 江泽慧黄安民费本华傅峰
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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