CN102539271A - Calibration method for measuring tree trunk moisture content by time domain reflectometry (TDR) - Google Patents
Calibration method for measuring tree trunk moisture content by time domain reflectometry (TDR) Download PDFInfo
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Abstract
The invention provides a calibration method for measuring the tree trunk moisture content by a time domain reflectometry (TDR). According to the method, the TDR and a scale are respectively utilized for continuously measuring the tree trunk section moisture content (moisture content measuring value) and the wet weight, in addition, a baking method is adopted for obtaining the dry weight of the tree truck section, the measured dry weight and wet weight data of the tree truck section can be utilized for calculating the corresponding moisture containing weight during the tree trunk moisture content measurement by using the TDR in each time, the corresponding moisture content (real value) can be calculated according to the timber water content definition, and the quantitative relationship between the real water content and the corresponding moisture content measuring value data according to the obtained real water content of the tree trunk section and the corresponding moisture content measuring value data, so a calibration model for measuring the tree trunk moisture content by using the TDR is obtained. According to the calibration model, the TDR can be utilized for carrying out in-situ dynamic monitoring on the moisture content of the live tree trunk, so the tree trunk moisture content measuring process is simplified, and in addition, the measuring precision is improved.
Description
Technical field:
The present invention relates to the forestry science and technology technical field, is the scaling method that a kind of TDR of utilization measures the trunk water percentage specifically.
Background technology:
Because of receiving the multiple influence of factors such as soil water regime, arboreal growth state and meteorological factor, the trunk water percentage presents periodic fluctuation to be changed.The trunk water percentage directly has influence on growth, growth and the evaporation water consumption process of trees, also is simultaneously the suitable index of formulating the trees irrigation program.American Society for testing and materials has formulated four kinds of standard timber determination of moisture methods, and a kind of is electrical measuring method, belongs to instant mensuration; Its excess-three kind is stove dry method (oven drying method), the way of distillation, titrimetry, and destructiveness is to a certain degree all arranged, and more time-consuming.It has been generally acknowledged that the stove dry method is standard method,, be applicable to any moisture state of any timber, less-restrictive because it is more accurate.Other three kinds of methods also are more accurately within the specific limits, and for example, the electric-resistivity method in the electrical measuring method can be accurate to 1% at timber moisture during at 7%-20%.Also development to some extent of microwave method and infrared method in recent years.Electrical measuring method is the electrical properties according to timber, and for example resistivity, specific inductive capacity, high frequency power loss etc. are measured water percentage with the relation of moisture content.Timber moisture electric pilot is easy for operation, measures rapidly, is applicable to the upward mensuration of control water percentage of industry.Timber moisture electric pilot mainly is divided into two kinds of direct current resistance formula and high-frequency ac dielectric cleanings.
In botany, also occurred applying to the High-density resistivity image method trial of trees internal resistance rate monitoring in recent years, and obtained certain effect.Contain a certain amount of inorganic mineral composition in the moisture in the trees body, thereby have certain electric conductivity.Through the one all electrodes of circular arrangement on the trees in growth; Xu Su etc. have analyzed the change procedure of rainfall front and back trunk resistivity; Think to have the advantage passage in the transport process of moisture in trunk,, be more conducive to transporting of moisture at trunk corner location short texture.But the result of gained does not combine the trunk resistivity image to make further analysis-by-synthesis.Through on the trunk after the felling, arranging a circle electrode; And utilize a two-dimentional iteration finite element inversion algorithm to carry out inverting; Hagrey has carried out the two-dimensional imaging analysis to the resistivity in trunk cross section, and observing structure and the resistivity that trunk cross section resistivity distribution has a series of circular concentric radially outwards has the trend of successively decreasing from nuclear portion.Utilization High-density resistivity image methods such as Wu Huaqiao are analyzed the inner structure of trunk, the radial distribution situation and the moisture loss process in time of moisture, so that be that inner structure and the growth conditions of better understanding trees provides scientific basis.The space distribution of resistivity presents a series of concentric structure on the trunk xsect, and to outer peripheral bast resistivity a trend that reduces is arranged from core, explains that the content of trees moisture in the cross section radially outwards has the trend that increases progressively gradually.In the time-varying process, each is monitored the distribution of the resistivity on the cross section and changes the passage process that has reflected cross section moisture basically, shows that High-density resistivity image method dynamic monitoring trunk moisture distribution and variation are feasible.Although the High-density resistivity image method is being measured the advantage that has additive method not possess on the trees water percentage, this technology exist cost higher, tree structure is destroyed shortcomings such as instability big and that influenced by extraneous factor to cause.
TDR (Time Domain Reflectometry; Time-domain reflectomer) method is a kind of method of more accurately measuring soil moisture content that generally adopts in recent years; It utilizes the principle of electromagnetic wave velocity of propagation difference in different medium to measure soil moisture content; Relatively have with traditional determining soil moisture method and not destroy sample, fast and easy advantage such as operation, and can accomplish message to change and reach the purpose of automatic data collection, thereby accepted by people very soon.Use TDR such as Topp carry out big quantitative determination to the specific inductive capacity of Different Soil, have set up the relation of soil dielectric constant and soil volumetric(al) moisture content, prove between the soil moisture content of specific inductive capacity and many soil typess to have correlativity preferably.This lays a good foundation for measuring soil moisture content through TDR.On principle, TDR also can be used for the measurement of trunk water percentage, just considers the difference of trunk and soil material, and the TDR measured value can not be represented the actual water percentage of trunk, exists certain quantitative relation between the two.
Summary of the invention:
The objective of the invention is to overcome the deficiency of above-mentioned prior art; And providing a kind of TDR of utilization to measure the scaling method of trunk water percentage, the method destructiveness result big, more time-consuming and that utilize TDR directly to measure the trunk water percentage who mainly solves existing measurement trunk water percentage can not represent problems such as the true water percentage of trunk.
For realizing above-mentioned purpose, the present invention is achieved in that a kind of TDR of utilization measures the scaling method of trunk water percentage, and its special character is may further comprise the steps:
(1) the test trees is supplied water fully, its trunk water percentage is reached or near the mxm. under the state of nature;
(2) trunk that will test trees is divided into some trunk sections, and the trunk segment length is 20-30cm;
(3) with instrument the flank hole of trunk section, the diameter of boring is consistent with the probe of the degree of depth and TDR, probe can all insert trunk section and contact closely;
(4) utilize high precision balance measurement trunk section quality, and record, this is the weight in wet base of trunk section; Utilize TDR that it is carried out measurement of water ratio subsequently, measure 5 times, average as this measurement result and record, this is the measurement of water ratio value in this moment of trunk section;
(5) trunk section to be measured is positioned over the room of shady and cool ventilation, lets its moisture spontaneous evaporation, every according to the principle that dredge earlier close back at a distance from 5 hours-1 day, the operation of repeating step (4);
(6) when trunk section measurement of water ratio value to be measured did not have significant change in 4-6 days, promptly luffing put it in the baking oven less than 5%, dries processing according to the standard of timber stoving;
(7) after the trunk section after will drying is taken out from baking oven, carry out quality weighing and record immediately, this is the dry weight of trunk section;
(8) utilize institute's assize to do dry weight and the weight in wet base data of section, can calculate the wet weight of correspondence when at every turn utilizing TDR to measure the trunk water percentage, can calculate corresponding water percentage according to the definition of moisture content, this is the true water percentage in this moment of trunk section;
(9) the true water percentage of trunk section that obtains according to step (4) and (8) and corresponding measurement of water ratio Value Data are to group; Utilize mathematical software can confirm the quantitative relationship of the two; Thereby obtain to utilize TDR to measure the peg model of trunk water percentage, the water percentage of setting trunk of living is carried out the original position dynamic monitoring according to this peg model TDR capable of using.
Compared with present technology the scaling method that a kind of TDR of utilization of the present invention measures the trunk water percentage has outstanding substantive distinguishing features and marked improvement: 1, this scaling method utilizes a trunk section in the possible range of trunk water percentage fluctuation, to demarcate; Measurement links and test material have been reduced; Practice thrift Measuring Time and relevant device input, greatly improved demarcation efficient; 2, this scaling method form is simple, and convenience of calculation is easy to use, and has effectively reduced the calculating duration, has greatly improved counting yield.
Description of drawings:
Fig. 1 is a demarcation process flow diagram of the present invention.
Embodiment:
In order to understand better and to implement, specify the present invention below in conjunction with embodiment.
Embodiment 1, confirms a representational tree on growing way in district to be measured, and it is fully supplied water at root reaches or near the mxm. under the state of nature up to its trunk water percentage; It is some for the trunk section of 20-30cm that the trunk that utilizes electric saw or other instruments to set is divided into length; With the flank hole of instruments such as electric drill in each trunk section, the number of boring, diameter are consistent with the probe of the degree of depth and TDR, guarantee that probe can all insert trunk section and contact closely; Utilize high precision balance (sensibility reciprocal is less than 1 gram) to trunk section weighing, and record, this is the weight in wet base of trunk section; Utilize TDR that it is carried out measurement of water ratio subsequently; Measure 5 times, average as this measurement result and record, this is the measurement of water ratio value in this moment of trunk section; Trunk section to be measured is positioned over the room of shady and cool ventilation; Let its moisture spontaneous evaporation; The principle of dredging according to first close back (5 hours-1 day) at regular intervals utilizes high precision balance (sensibility reciprocal is less than 1 gram) to trunk section weighing, to utilize TDR that it is carried out measurement of water ratio subsequently; When trunk section measurement of water ratio value to be measured in a long time (4-6 days) put it in the baking oven when not having significant change (luffing is less than 5%), dry processing according to the standard of timber stoving; After the baking oven taking-up, weigh the trunk section after the oven dry in the balance heavy and record immediately, this is the dry weight of trunk section; Utilize institute's assize to do dry weight and the weight in wet base data of section, can calculate the wet weight of correspondence when at every turn utilizing TDR to measure the trunk water percentage, can calculate corresponding water percentage according to the definition of moisture content, this is the true water percentage in this moment of trunk section; The true water percentage of trunk section that obtains according to the different periods and corresponding measurement of water ratio Value Data are to group; Utilize mathematical software can confirm the quantitative relationship of the two; Thereby obtain to utilize TDR to measure the peg model of trunk water percentage, the water percentage of setting trunk of living is carried out the original position dynamic monitoring according to this peg model TDR capable of using.
Claims (1)
1. scaling method that utilizes TDR to measure the trunk water percentage is characterized in that may further comprise the steps:
(1) the test trees is supplied water fully, its trunk water percentage is reached or near the mxm. under the state of nature;
(2) trunk that will test trees is divided into some trunk sections;
(3) with instrument the flank hole of trunk section, the diameter of boring is consistent with the probe of the degree of depth and TDR, probe can all insert trunk section and contact closely;
(4) utilize high precision balance measurement trunk section quality, and write down the weight in wet base that this is the trunk section; Utilize TDR that it is carried out measurement of water ratio subsequently, measure 5 times, average as this measurement result and record, this is the measurement of water ratio value in this moment of trunk section;
(5) trunk section to be measured is positioned over the room of shady and cool ventilation, lets its moisture spontaneous evaporation, every according to the principle that dredge earlier close back at a distance from 5 hours-1 day, the operation of repeating step (4);
(6) put it in the baking oven less than 5% when trunk section measurement of water ratio value to be measured luffing in 4-6 days, dry processing according to the standard of timber stoving;
(7) after the trunk section after will drying is taken out from baking oven, carry out quality weighing and record immediately, this is the dry weight of trunk section;
(8) utilize institute's assize to do dry weight and the weight in wet base data of section, can calculate the wet weight of correspondence when at every turn utilizing TDR to measure the trunk water percentage, can calculate corresponding water percentage according to the definition of moisture content, this is the true water percentage in this moment of trunk section;
(9) the true water percentage of trunk section that obtains according to step (4) and (8) and corresponding measurement of water ratio Value Data are to group; Utilize mathematical software can confirm the quantitative relationship of the two; Thereby obtain to utilize TDR to measure the peg model of trunk water percentage, the water percentage of setting trunk of living is carried out the original position dynamic monitoring according to this peg model TDR capable of using.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535446A (en) * | 2014-12-24 | 2015-04-22 | 柳州市自动化科学研究所 | Method and device for detecting moisture of spread tea leaves |
| CN106018685A (en) * | 2016-05-13 | 2016-10-12 | 福建森宝食品集团股份有限公司 | Feed moisture quick measuring method |
| CN106066350A (en) * | 2016-05-21 | 2016-11-02 | 西南交通大学 | Soil body quality moisture content correction method of testing based on bushing type probe TDR method |
| CN106198650A (en) * | 2016-07-04 | 2016-12-07 | 中国环境科学研究院 | A kind of assay method of debirs material moisture |
| CN106840954A (en) * | 2017-03-27 | 2017-06-13 | 上海事凡物联网科技有限公司 | The scaling method and caliberating device of fallen leaves moisture content |
| CN107014867A (en) * | 2017-04-17 | 2017-08-04 | 张家港市检验检测中心 | The method of resistance calibration moisture content measuring instrument indicating value |
| CN107478681A (en) * | 2017-07-31 | 2017-12-15 | 宁夏大学 | A kind of soil water-containing quantity measuring method based on time-domain reflectomer |
| CN108064336A (en) * | 2017-11-09 | 2018-05-22 | 苏州迪维勒普信息科技有限公司 | A kind of scaling method that fallen leaves moisture content is measured using tubular type FDR sensors |
| CN108120655A (en) * | 2017-12-22 | 2018-06-05 | 宁夏大学 | A kind of moisture predictor method based on the adaptive LM algorithms of damping factor |
| CN109588287A (en) * | 2018-11-13 | 2019-04-09 | 湖北工业大学 | A kind of brainpower insufflation device perceiving water-cut variation in lawn plant body |
| CN111189886A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Method for measuring moisture content of trunk |
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Cited By (15)
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| CN104535446A (en) * | 2014-12-24 | 2015-04-22 | 柳州市自动化科学研究所 | Method and device for detecting moisture of spread tea leaves |
| CN106018685A (en) * | 2016-05-13 | 2016-10-12 | 福建森宝食品集团股份有限公司 | Feed moisture quick measuring method |
| CN106066350A (en) * | 2016-05-21 | 2016-11-02 | 西南交通大学 | Soil body quality moisture content correction method of testing based on bushing type probe TDR method |
| CN106198650A (en) * | 2016-07-04 | 2016-12-07 | 中国环境科学研究院 | A kind of assay method of debirs material moisture |
| CN106840954B (en) * | 2017-03-27 | 2020-08-25 | 上海事凡物联网科技有限公司 | Calibration method for water content of fallen leaves |
| CN106840954A (en) * | 2017-03-27 | 2017-06-13 | 上海事凡物联网科技有限公司 | The scaling method and caliberating device of fallen leaves moisture content |
| CN107014867A (en) * | 2017-04-17 | 2017-08-04 | 张家港市检验检测中心 | The method of resistance calibration moisture content measuring instrument indicating value |
| CN107478681A (en) * | 2017-07-31 | 2017-12-15 | 宁夏大学 | A kind of soil water-containing quantity measuring method based on time-domain reflectomer |
| WO2019090557A1 (en) * | 2017-11-09 | 2019-05-16 | 苏州迪维勒普信息科技有限公司 | Calibration method for measuring moisture content of fallen leaves using tubular fdr sensor |
| CN108064336A (en) * | 2017-11-09 | 2018-05-22 | 苏州迪维勒普信息科技有限公司 | A kind of scaling method that fallen leaves moisture content is measured using tubular type FDR sensors |
| CN108120655A (en) * | 2017-12-22 | 2018-06-05 | 宁夏大学 | A kind of moisture predictor method based on the adaptive LM algorithms of damping factor |
| CN108120655B (en) * | 2017-12-22 | 2020-06-09 | 宁夏大学 | Damping factor self-adaptive LM algorithm-based moisture content estimation method |
| CN109588287A (en) * | 2018-11-13 | 2019-04-09 | 湖北工业大学 | A kind of brainpower insufflation device perceiving water-cut variation in lawn plant body |
| CN111189886A (en) * | 2020-01-08 | 2020-05-22 | 天津农学院 | Method for measuring moisture content of trunk |
| CN111189886B (en) * | 2020-01-08 | 2022-05-03 | 天津农学院 | Method for measuring moisture content of trunk |
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