CN102192891A - Method for quickly determining air-dry density of wood by near infrared spectral analysis technology - Google Patents
Method for quickly determining air-dry density of wood by near infrared spectral analysis technology Download PDFInfo
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- CN102192891A CN102192891A CN 201010116721 CN201010116721A CN102192891A CN 102192891 A CN102192891 A CN 102192891A CN 201010116721 CN201010116721 CN 201010116721 CN 201010116721 A CN201010116721 A CN 201010116721A CN 102192891 A CN102192891 A CN 102192891A
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Abstract
The invention discloses a method for quickly determining air-dry density of wood by a near infrared spectral analysis technology, which solves the problems that the dimension is inaccurately measured and a sample is difficult to prepare during the conventional linear measurement of the air-dry density of the wood, and has the advantages that: the method is easy to perform, quick and convenient, the air-dry density of the wood can be effectively, quickly and accurately analyzed and determined, and the like. The method comprises the following steps of: a, manufacturing a wood block sample according to the dimension of 30mm*30mm*30mm; b, determining the air-dry density of the wood by a linear measurement method; c, acquiring the near infrared spectrum data of the wood block sample by using a near infrared spectrum analyzer; d, establishing a mathematic prediction model by using the actual measurement value of the air-dry density and the near infrared spectrum data of the wood by a stoichiometric method; and e, analyzing the near infrared spectrum data of the wood with an unknown air-dry density, which is acquired according to the step c, by using the established mathematic model so as to quickly and accurately determine the dir-dry density of the wood.
Description
Technical field
The present invention is a kind of timber air-dry density assay method, especially a kind of method of utilizing near-infrared spectral analysis technology fast measuring timber air-dry density.
Background technology
As everyone knows, carry out pulping and paper-making, need to obtain accurately, rapidly, widely the density of timber in order to utilize plupwood.Density is most important person in the wood property, and the mechanical property of timber, hardness, resistance to abrasion, timber calorific value, timber boiling dress pot amount and paper pulp yield all have confidential relation with density of wood.Yet, adopt traditional wood property evaluation method generally need consume great amount of manpower and time.Therefore, seek a kind of method of fast, accurately estimating density of wood, become one of important content of pulping and paper-making scientific research.
Near infrared spectrum (Near Infrared Spectroscopy, be called for short NIRS) analytical technology is to utilize the mathematical relation of setting up between the near infrared characteristic absorption peak of sample and sample composition content and the performance, predicts unknown sample component content and performance thereof.With in infrared comparing, although the frequency multiplication of near infrared spectrum or combination frequency absorption intensity are than about low 1～3 order of magnitude of fundamental frequency peak intensity, but disturb, so in a bigger absorption dynamic range, between these intensities of absorption bands and the measured object concentration linear relationship is arranged because these weak absorption bands do not demonstrate the edge at the MIR absorption band.Near-infrared spectral analysis technology also is a kind of efficiently modern analytical technique fast, integrated use the newest research results of a plurality of subjects such as computer technology, spectral technique and Chemical Measurement, obtain increasingly extensive application with its special advantages in a plurality of fields, and obtained popular generally acceptance gradually.In recent years, because the further investigation and the widespread use of the development, particularly Chemical Measurement of computing machine and chemometrics software make near-infrared spectrum technique become with fastest developing speed, the most noticeable spectral technique.In the short more than ten years, near-infrared spectrum technique fast development becomes an analytical technology that has competitive power.
Near-infrared spectral analysis technology is a new timber Nondestructive Evaluation technology, can be rapidly, exactly the character of samples such as solid wood or wood powder is carried out comprehensive Nondestructive Evaluation.
Summary of the invention
Purpose of the present invention is exactly the problem of the inaccurate and specimen preparation difficulty of the dimensional measurement that exists when solving existing timber air-dry density assay determination, provide a kind of simple and easy to do, efficient and convenient, can carry out the method for assay determination effectively, quickly and accurately to the timber air-dry density.
To achieve these goals, the present invention has adopted following technical scheme: a kind of method of utilizing near-infrared spectral analysis technology fast measuring timber air-dry density.Its method is: a. makes the sample wooden unit by size 30mm * 30mm * 30mm; B. measure the timber air-dry density with straight line measurement method; C. utilize near-infrared spectrometers to gather the near infrared spectrum data of wooden unit sample; D. the mathematical prediction model that adopts stechiometry that air-dry density measured value and its near infrared spectrum data of timber are set up; E. the mathematical prediction model of adopt setting up is analyzed the timber near infrared spectrum data of the unknown air-dry density that c set by step gathers, thereby measures the timber air-dry density quickly and accurately.
The wooden unit sample comprises needlebush and leaf wood among the described step a.
Near infrared spectrum data is the absorbance that utilizes near-infrared spectrometers to adopt integrating sphere diffuse reflection mode to obtain among the described step c.
Stechiometry is a partial least square method in the described steps d, adopts maximum-minimum normalization to carry out pre-service to spectroscopic data, and the mathematical prediction model is that needlebush and leaf wood mix the mathematical prediction model of setting up.
The present invention adopts the near infrared spectrometer can be under the situation that need not be prepared into 30mm * 30mm * 30mm wooden unit, utilize the near infrared spectrum data of near infrared spectrometer collection timber and set up the mathematical prediction model, the mathematical model that employing is built up can be measured the timber air-dry density quickly and accurately, and cultivating for pulping and paper-making and forest provides the support of rapid technology data.
Description of drawings
The air-dry density illustraton of model of Fig. 1 for adopting this method to set up.
Embodiment
Collect various leaf woods and needlebush, make the sample wooden unit, behind the adjustment wooden unit moisture, measure the timber air-dry density and adopt near infrared spectrometer at 12500～3600cm with straight line measurement method by size 30mm * 30mm * 30mm
-1Gather near infrared spectrum data in the spectrum range.
Adopt the partial least square method in the stechiometry that air-dry density measured value and its near infrared spectrum data of timber are set up the timber mathematical model, and model is optimized, reject some abnormal samples, make the coefficient of determination (R of model
2) reach more than 0.97, cross validation root-mean-square-deviation (RMSECV) value is 0.0152, residual prediction deviation (RPD) is greater than 6.4, as shown in Figure 1.
Good model is analyzed the near infrared spectrum data of unknown air-dry density timber to utilize foundation, can measure the air-dry density of measuring timber quickly and accurately.
The sub-measurement result of embodiments of the invention sees Table 1.
Table 1 near infrared air-dry density model and straight line measure the method measured value relatively
Claims (7)
1. method of utilizing near-infrared spectral analysis technology fast measuring timber air-dry density.It is characterized in that comprising that following step: a. makes the sample wooden unit by size 30mm * 30mm * 30mm; B. measure the timber air-dry density with straight line measurement method; C. utilize near-infrared spectrometers to gather the near infrared spectrum data of wooden unit sample; D. the mathematical prediction model that adopts stechiometry that air-dry density measured value and its near infrared spectrum data of timber are set up; E. the mathematical prediction model of adopt setting up is analyzed the timber near infrared spectrum data of the unknown air-dry density that c set by step gathers, thereby measures the timber air-dry density quickly and accurately.
2. according to claims 1 described method, it is characterized in that: described wood sample comprises needlebush and leaf wood.
3. according to claims 1 described method, it is characterized in that: the wooden unit among the described step a is of a size of 30mm * 30mm * 30mm.
4. according to claims 1 described method, it is characterized in that: described near infrared spectrum data is the absorbance that utilizes near-infrared spectrometers to adopt integrating sphere diffuse reflection mode to obtain.
5. according to claims 1 described method, it is characterized in that: spectroscopic data is carried out minimum-maximum normalization pre-service.
6. according to claims 1 described method, it is characterized in that: described density of wood is an air-dry density.
7. according to claims 1 described method, it is characterized in that: described mathematical prediction model is that needlebush and leaf wood mix the mathematical prediction model of setting up.
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| CN 201010116721 CN102192891A (en) | 2010-03-03 | 2010-03-03 | Method for quickly determining air-dry density of wood by near infrared spectral analysis technology |
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| CN 201010116721 CN102192891A (en) | 2010-03-03 | 2010-03-03 | Method for quickly determining air-dry density of wood by near infrared spectral analysis technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192890A (en) * | 2010-03-03 | 2011-09-21 | 中国制浆造纸研究院 | Method for rapidly measuring chemical compositions of wood by utilizing near infrared spectroscopic analysis technique |
| CN104132865A (en) * | 2014-08-15 | 2014-11-05 | 华南农业大学 | Method for predicting density of wood of loblolly pine by utilizing near-infrared spectrum technology |
| CN104132910A (en) * | 2014-08-15 | 2014-11-05 | 华南农业大学 | Method for predicating length of pinus taeda wood fibers by using near infrared spectrum technology |
| CN104568814A (en) * | 2014-12-22 | 2015-04-29 | 中南林业科技大学 | Wood hydroxyl accessibility spectrum detection device and method |
| CN105223102A (en) * | 2015-09-29 | 2016-01-06 | 中国林业科学研究院林产化学工业研究所 | A kind of method utilizing Near Infrared Spectroscopy for Rapid slurrying material basic density |
| CN106053380A (en) * | 2016-05-24 | 2016-10-26 | 中国林业科学研究院林产化学工业研究所 | Method for quickly analyzing proportions of tree species of mixed pulp wood by aid of near infrared spectrum technologies |
| CN106323908A (en) * | 2016-08-19 | 2017-01-11 | 中国林业科学研究院热带林业研究所 | Method for measuring wood basic density and green density of eucalyptus cloeziana |
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| CN1936537A (en) * | 2006-10-12 | 2007-03-28 | 中国林业科学研究院木材工业研究所 | Method for measuring density of Huoli Wood using near infrared spectrum |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192890A (en) * | 2010-03-03 | 2011-09-21 | 中国制浆造纸研究院 | Method for rapidly measuring chemical compositions of wood by utilizing near infrared spectroscopic analysis technique |
| CN104132865A (en) * | 2014-08-15 | 2014-11-05 | 华南农业大学 | Method for predicting density of wood of loblolly pine by utilizing near-infrared spectrum technology |
| CN104132910A (en) * | 2014-08-15 | 2014-11-05 | 华南农业大学 | Method for predicating length of pinus taeda wood fibers by using near infrared spectrum technology |
| CN104568814A (en) * | 2014-12-22 | 2015-04-29 | 中南林业科技大学 | Wood hydroxyl accessibility spectrum detection device and method |
| CN105223102A (en) * | 2015-09-29 | 2016-01-06 | 中国林业科学研究院林产化学工业研究所 | A kind of method utilizing Near Infrared Spectroscopy for Rapid slurrying material basic density |
| CN106053380A (en) * | 2016-05-24 | 2016-10-26 | 中国林业科学研究院林产化学工业研究所 | Method for quickly analyzing proportions of tree species of mixed pulp wood by aid of near infrared spectrum technologies |
| CN106323908A (en) * | 2016-08-19 | 2017-01-11 | 中国林业科学研究院热带林业研究所 | Method for measuring wood basic density and green density of eucalyptus cloeziana |
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Application publication date: 20110921 |