CN101387497A - Method for measuring plant fiber material fibre morphology by near-infrared spectrum technology - Google Patents
Method for measuring plant fiber material fibre morphology by near-infrared spectrum technology Download PDFInfo
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- CN101387497A CN101387497A CNA2008101720574A CN200810172057A CN101387497A CN 101387497 A CN101387497 A CN 101387497A CN A2008101720574 A CNA2008101720574 A CN A2008101720574A CN 200810172057 A CN200810172057 A CN 200810172057A CN 101387497 A CN101387497 A CN 101387497A
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Abstract
The invention discloses a method for measuring fiber shape of a plant fiber material by using a near infrared spectrum technology. The method solves the problems of high cost, long period and so on in analysis of the prior fiber shape, and has the characteristics of simplicity, quickness and convenience. The method comprises the following steps: a, selecting at least 50 plant fiber material samples; b, acquiring diffuse reflection near infrared spectrums of the samples within a near infrared spectrum range; c, measuring the fiber shape by using an electron microscope; d, preprocessing spectrograms by using different methods; and e, establishing a correction model for the lengths of wood fibers by applying multiple regression. By using the established model to analyze the fiber shape of unknown samples, the method can realize quick analysis of the fiber shape of the plant fiber material by using the near infrared spectrum.
Description
Technical field
The invention relates to the method for building up of fibre morphology model in the sponge and utilize this model determination fibre morphology.
Background technology
Along with the raising of environmental requirement, people more and more tend to use the natural plant material of environmental protection.And natural plant material is because the kind difference, adds that self variability is very big, and its fibre morphology difference is very big.And different fibre morphologies has crucial effect to its utilization, so fibre morphology is very important index of plant fiber material.For example, the quality of fibre morphology and final paper is closely bound up in the paper industry, and estimating one of most important index of paper quality is exactly fibre length.
Usually measuring fibre morphology is to use electron microscope, concrete steps are wood chip to be cut into the matchstick size mix again, sampling is after water is put into the mixed liquor that fills glacial acetic acid and hydrogen peroxide after boiling exhaust repeatedly, place 60 ℃ water bath with thermostatic control, treat to take out behind the full bleaching, put into the fiber card breaker after cleaning and fully decompose and allow sample evenly mix, the single fiber that disperses is made slide, usefulness during for mensuration after with the sarranine solution-dyed.Each sample is surveyed fiber more than 300 during mensuration.This method is very consuming time, because the sample bleaching needs long time, generally about 40 hours, adds that other are equipped with sample time and Measuring Time, generally all need about 60 hours.Therefore, adopt when only being adapted in the laboratory small sample quantities, be not suitable for large batch of mensuration.The eighties, Finland worked out a kind of Kajaani of crying FS100 surveying instrument, and this instrument utilizes computer image technology can measure a large amount of fibre lengths and width at short notice, has improved the efficiency of measurement of fiber greatly.Through improving, form kajaani FS200 type in recent years, well solved the deficiency of Kajaani FS100.But this method sample making course is still more time-consuming with traditional the same.SilviScan is a kind of timber wood property fast measuring instrument of forestry of Science Industry Research Inst of Australian Union and the research and development of forestry products research institute, developed into SilviScan-3 at present, it is X-ray scanning densitometer, X-ray diffraction meter and image analysis apparatus are formed an individual system, can directly scan timber, obtain image post analysis fibre morphology etc., analysis speed is greatly improved, but cost an arm and a leg, can not popularize.Near-infrared spectral analysis technology is a kind of high-new analytical technology that grows up along with development of computer, has simple, fast, efficient, environmental protection, save to detect advantages such as cost, just more and more used and become one of analysis and testing technology with fastest developing speed.
Show from the retrieval of China Intellectual Property Office's patent retrieval database, have only two pieces about the patent of fibre morphology, all be the length of calculating fiber according to computer picture, surplus having 200 about near infrared patent, the overwhelming majority concentrates on the development aspect of near infrared spectrometer and some parts thereof and the researchs such as chemical composition of various raw materials, does not see the fibre morphology with the near infrared detection plant material as yet.In addition, show that patent also not having be arranged both at home and abroad at present is to utilize near-infrared spectral analysis technology to measure the fibre morphology of plant fiber material by the retrieval on patent query web such as online patent retrieval of Google and US and European.
Summary of the invention
The method that the purpose of this invention is to provide a kind of Non-Destructive Testing plant fiber material fibre morphology based on near-infrared spectrum technique, adopt near-infrared spectrum technique, compare with traditional fibre morphology analytical test means, have fast, save time, advantage such as laborsaving, environmental protection.
For achieving the above object, the technical solution used in the present invention step is as follows: a, get and be no less than 50 representative plant fiber material samples.The diffuse reflection spectrum of b, employing near infrared spectrometer measuring samples.C, spectroscopic data is proofreaied and correct and pre-service, set up near-infrared spectrum analysis mathematical model between spectroscopic data and the fibre morphology with modern multiple regression algorithm.D, with the plant fiber material of unknown fibre morphology set by step the method for b obtain its spectroscopic data, after the preprocess method processing of the spectroscopic data of unknown sample in step c, spectrum characteristics is sent into calibration model, can measure the fibre morphology of unknown sample.
Description of drawings
Figure is the fiber width model that the inventive method is set up
Embodiment
Exemplary embodiments of the present invention is measured the fiber width of timber
(1) sample is selected; At first select acacia rachii 16 strains of the representative different strains and the different age of trees, get a disk every 1.5m, get 4-6 disk, get 78 in disk altogether according to different every the trees of the height of tree along height of tree direction.
(2) scanning spectrogram; In 4000cm-1-12000cm-1 spectrum district, scanning 64 times on average becomes a spectroscopic data, resolution 8cm with sample
-1, adopt universal stage to increase sampling area, the diffuse reflection spectrum of collected specimens.
(3) survey fibre morphology; The batten that makes after boiling exhaust repeatedly, is put in water the mixed liquor that fills glacial acetic acid and hydrogen peroxide, place 60 ℃ water bath with thermostatic control, treat to take out behind the full bleaching, putting into the fiber card breaker after cleaning fully decomposes and allows sample evenly mix, the single fiber that disperses is made slide after with the sarranine solution-dyed, on eriometer, measure fiber width.
(4) spectrum pre-service; Obtain behind the sample spectrum spectroscopic data to be carried out 17 smoothing processing and second derivative pre-service.
(5) foundation of model; Utilize the partial least square method in the multivariate analysis software, between the spectroscopic data that handled the fiber width of measuring and above-mentioned (4), set up the fiber width model in above-mentioned (3).
(6) prediction fiber width; At first scan sample to be tested and obtain spectrogram, the measuring method that is adopted when obtaining their spectrogram, the measuring method that must be adopted with obtain reference sample the time is consistent, such as the method for sampling, rate, sweep time etc., parameter should be consistent respectively.The spectral signature parameter of unknown kind sample is sent into the fiber width that calibration model can be measured unknown sample.
Claims (7)
1, a kind of method with near-infrared spectral measurement sponge fibre morphology.The steps include: that a. selects to be no less than 50 plant fiber material samples; B. near infrared spectral range, the diffuse reflection near infrared light spectrogram of collected specimens; C. measure the fibre morphology of sponge with electron microscope; D. adopt distinct methods to the spectrogram pre-service; E. use the calibration model that the sponge fibre length is set up in multiple regression.
2, method according to claim 1, wherein, described sponge is lumber fibre, non-wood-fiber or half lumber fibre.
3, method according to claim 1, wherein, described plant fiber material samples comprises its powder, various forms such as blade, wooden unit and wood shavings.
4, method according to claim 1, wherein, described fibre morphology is arithmetic mean fibre length, weight average length, fiber width, fiber surface roughness etc.
5, method according to claim 1, wherein, described near infrared spectrum data is to utilize near infrared spectrometer to adopt the absorbance of the plant fiber material samples corresponding with wavelength of diffuse reflection method acquisition.
6, method according to claim 1, wherein, described preprocess method is smoothing processing, reduce, differential, normalization, standardization, polynary scatter correction, the polynary scatter correction of segmentation, derivative, baseline correction, wavelet transformation, eliminates constant offset, orthogonal signal and do not have any processing.The preprocess method that adopts is the combination of a kind of or any several method wherein.
7, method according to claim 1, wherein, described chemometrics method is selected from a kind of in multiple linear regression, progressively recurrence, principal component analysis (PCA), principal component regression, partial least square method, artificial neural network and the topological analysis method.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101720574A CN101387497A (en) | 2008-10-28 | 2008-10-28 | Method for measuring plant fiber material fibre morphology by near-infrared spectrum technology |
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| CNA2008101720574A CN101387497A (en) | 2008-10-28 | 2008-10-28 | Method for measuring plant fiber material fibre morphology by near-infrared spectrum technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581665A (en) * | 2009-03-20 | 2009-11-18 | 北京林业大学 | Method for directly predicting adaptability of pulp of vegetable fibre material |
| CN101900673A (en) * | 2010-06-02 | 2010-12-01 | 北京林业大学 | Method of on-line non-destructive testing paper performance |
| 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 |
| CN106092913A (en) * | 2015-05-29 | 2016-11-09 | 深圳市琨伦创业投资有限公司 | A kind of corps nutrient safety detection method and system thereof |
-
2008
- 2008-10-28 CN CNA2008101720574A patent/CN101387497A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581665A (en) * | 2009-03-20 | 2009-11-18 | 北京林业大学 | Method for directly predicting adaptability of pulp of vegetable fibre material |
| 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 |
| CN101900673A (en) * | 2010-06-02 | 2010-12-01 | 北京林业大学 | Method of on-line non-destructive testing paper performance |
| CN106092913A (en) * | 2015-05-29 | 2016-11-09 | 深圳市琨伦创业投资有限公司 | A kind of corps nutrient safety detection method and system thereof |
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Open date: 20090318 |