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Wood moisture content detection method based on infrared difference spectrum technology

A technology of infrared difference spectrum and detection method, which is applied in the direction of measuring device, material analysis, and material analysis through optical means, which can solve the inconvenience of forestry researchers and achieve the effect of reducing the amount of wood samples and rapid detection

Inactive Publication Date: 2017-06-30
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • 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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  • Wood moisture content detection method based on infrared difference spectrum technology
  • Wood moisture content detection method based on infrared difference spectrum technology

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Ginkgo wood is made into a sample of 10mm wide * 10mm wide * thick 8 μm size, placed in a constant temperature and humidity box for cultivation, and the relative humidity obtained 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 8-10 hours. The difference between the last two weighings is extremely small (no more than 0.3%), and a fully dry sample is obtained;

[0033] (3) Utilize the moisture content W of the ginkgo wood equilibrium sample of the different relative humidity that obtains in (1) by conventional drying method;

[0034] (4) Utilize infrared spectrometer to record the infrared spectrogram I of the fully dry sample in (2) 0％ Infrared spectrogram I of equilibrium sample under different relative humidity in (1) 10％ , I 20％ , I 30％ , I 40％ , I 50％ , I 60％ , I 70％ ,...

Embodiment 2

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

Embodiment 3

[0040] Using the method in Example 1, the moisture content of the pine wood sample was detected by infrared differential spectrum, and the regression equation was obtained: W=0.0043A W-0 +0.0062. When testing pine wood samples in batches, a single sample takes only 1s. A pine wood sample with a relative humidity of 15% was randomly obtained. Using the above method, the measured moisture content was 0.0424, while the moisture content measured by the traditional drying method was 0.042, and the calculated relative error was 0.95%. The results show that the method of the present invention can quickly and accurately detect the moisture content of wood.

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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 Patents(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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