Method for detecting moisture content of wood on basis of infrared differential spectrum technology

A technology of infrared difference spectrum and detection method, which is applied in measurement devices, analysis materials, material analysis by optical means, etc., can solve problems such as inconvenience for forestry researchers, and achieve the effect of reducing the amount of wood samples and fast detection.

Inactive Publication Date: 2015-03-04
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive method is to design a moisture meter by using the regular relationship between the electrical properties of wood, such as resistivity, dielectric constant and power factor, and the moisture content of wood. Since the relationship between wood moisture content and resistivity is only at a certain moisture content There is a changing relationship within the range, and it is not obvious beyond this limit. Therefore, the conductive method has certain limitations.
The limitations of the above methods bring great inconvenience to forestry researchers

Method used

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  • Method for detecting moisture content of wood on basis of infrared differential spectrum technology
  • Method for detecting moisture content of wood on basis of infrared differential spectrum technology

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Ginkgo biloba wood is made into a sample with a size of 10mm long × 10mm wide × 8 μm thick, and placed in a constant temperature and humidity box for cultivation, and the relative humidity is 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% ginkgo wood balance samples;

[0032] (2) Put the ginkgo wood sample into the oven, first dry it at 60°C for 2 hours, then adjust the temperature to 103±2°C, and dry it continuously for 8~10h, during which time, weigh it every 2h until The difference between the last two weighings is extremely small (no more than 0.3%), and a fully dry sample is obtained;

[0033] (3) Determination of moisture content W of ginkgo wood equilibrium samples with different relative humidity obtained in (1) by traditional drying method;

[0034] (4) The whole dry sample I in (2) was measured by infrared spectrometer 0% The infrared spectrum of and the infrared spectrum of the equilibrium sample under different relative humidity in (1) I 10% , I 20% ...

Embodiment 2

[0038] Utilize method in embodiment 1, carry out infrared difference spectrum detection to the water content of Mandshurica mandshurica sample, obtain regression equation: W=0.0048AW-0 -0.0016. When testing ash samples in batches, the time for a single sample is only 1s. Fraxinus mandshurica samples with a relative humidity of 15% were randomly prepared. Using the above method, the moisture content was measured to be 0.0348, while the moisture content measured by the traditional drying method was 0.034, and the relative calculation error was 2.35%. The results show that the method of the present invention can be used to detect the moisture content of wood quickly and accurately.

Embodiment 3

[0040] Utilize the method in embodiment 1, carry out infrared difference spectrum detection to the moisture content of pine wood sample, obtain regression equation: W=0.0043A W-0 +0.0062. When testing pine wood samples in batches, the time for a single sample is only 1s. The pine samples with a relative humidity of 15% were randomly prepared. Using the above method, the moisture content was measured to be 0.0424, while the moisture content measured by the traditional drying method was 0.042, and the relative calculation error was 0.95%. The results show that the method of the present invention can be used to detect the moisture content of wood quickly and accurately.

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Abstract

The invention discloses a method for detecting moisture content of wood on the basis of an infrared differential spectrum technology. The method is characterized by comprising the steps of selecting wood to be detected, preparing an absolutely-dry sample and balance samples of different relative humidity by utilizing the selected wood; measuring an infrared spectrogram I<o> of the absolutely-dry sample and an infrared spectrogram I<w> of each balance sample by utilizing an infrared spectrometer; subtracting the infrared spectrogram I<o> of the absolutely-dry sample from the infrared spectrogram I<w> of the balance sample to obtain an infrared differential spectrogram I<w-o>; solving an area A<w-o> in the range of 2900 to 3750 cm<-1> in the infrared differential spectrogram; determining the moisture content W of the wood samples of different relative humidity by utilizing a traditional drying method; linearly regressing the moisture content W and the area A<w-o> of each sample by utilizing a least square method to establish a model for detecting the moisture content of the wood by utilizing the infrared differential spectrum technology. The model can be used for the mass detection of the wood samples to be detected, each sample is detected only for one second, and the detection time of the wood moisture content is greatly shortened. The method has advantages of short period, rapidness in detection and micro scale and even trace amount of needed sample, is a nondestructive detection technique and can be applied to the field of the evaluation of wood.

Description

technical field [0001] The invention relates to the field of wood quality measurement, in particular to a wood moisture content detection method based on infrared difference spectrum technology. Background technique [0002] Wood moisture content is one of the important physical properties of wood, which is closely related to wood mechanical properties and wood utilization. There are roughly 4 methods for determining the moisture content of wood: drying method, distillation method, titration method and conductivity method. Drying method, also known as gravimetric method, is easy to operate and accurate in results, but takes a long time. The determination results of the distillation method are not very accurate, and the titration method is more expensive. The conductive method is to design a moisture meter by using the regular relationship between the electrical properties of wood, such as resistivity, dielectric constant and power factor, and the moisture content of wood. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
Inventor 郭鑫吴义强乔建政黄自知卿彦胡云楚
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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