CN110174434A  Heterogeneous content and its method of distribution in a kind of measurement porous material  Google Patents
Heterogeneous content and its method of distribution in a kind of measurement porous material Download PDFInfo
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 CN110174434A CN110174434A CN201910442695.1A CN201910442695A CN110174434A CN 110174434 A CN110174434 A CN 110174434A CN 201910442695 A CN201910442695 A CN 201910442695A CN 110174434 A CN110174434 A CN 110174434A
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 G01—MEASURING; TESTING
 G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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 G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses heterogeneous content and its methods of distribution in a kind of measurement porous material, the method for arranging fitted closely by the first heatflow meter sensor, sheetlike plane heat source, the second heatflow meter sensor, measure the temperature rise and hotfluid distribution of sheetlike plane heat source two sides, uneven distribution heterogeneous in measured material can be effectively recognized, while realizing that oneshot measurement obtains the heterogeneous content of sheetlike plane heat source two sides.Based on the above method, according to the Limited propagation thickness of thermal perturbation, reasonable Arrangement sensor test position avoids in material that there are measurement blind areas, heterogeneous content in material, which is obtained, by data interpolating and fitting finally obtains the onedimensional of heterogeneous content in material, plane or threedimensional distribution with the function of change in location.
Description
Technical field
The invention belongs to testing of materials analysis technical fields, are related to a kind of Adsorbent By Using Transient Plane Source Technique based on heatflow meter, come
Measure heterogeneous content and its method of distribution in porous material.
Background technique
When there is heterogeneous intrusion in porous material, the physical parameter and service performance of material itself are changed correspondingly.For example, wide
There are moistureabsorption characteristics for the general porous insulation material applied to building energy saving field, and the intrusion of moisture causes to keep the temperature in use
Soundproof effect decline, and mildew is bred, the service life of material is reduced, building energy consumption is increased.Therefore, accurately measurement material is heterogeneous
Content and its distribution have very great help for the service performance tool for promoting material.
The detection of foreign elements content has electric method, calorifics method, ray method etc. in porous material at present.Wherein calorifics method because
The easy inexpensively broad range of applicability of measurement.Heat source is arranged in calorifics method in measured material, by monitoring away from heat source fixed range
Material in certain point transient temperature rise, solve measured material thermal physical property parameter, such as volumetric heat capacity, the variation before and after heterogeneous intrusion
Amount, the final heterogeneous content obtained in measured material.The current calorifics method measurement heterogeneous content of material has the disadvantage in that
(1) since heater separates arrangement with temperature point, temperature point monitors that the premise of effective temperature rise is heater
There is larger calorific value, and big calorific value will induce free convection and radiant heat transfer in portion in the porous material, reduce measuring accuracy；
(2) arranged in actual measurement material deformation that heater and temperature measuring point may cause make heater and temperature measuring point it
Between distance be not fixed, influence the accuracy of heterogeneous content measurement；
(3) distribution when heterogeneous intrusion measured material may and it is uneven, therefore heater is in material on different directions
Generated hotfluid may be also uneven, and traditional thermology method is only applicable to the situation that heterogeneous content is evenly distributed in material；
(4) heterogeneous in the resulting measured material of existing measurement method containing numerical quantity or numberical range majority is by single measuring point
It measures, can not effectively speculate the spatial distribution of heterogeneous content in material.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provide in a kind of measurement porous material heterogeneous content and its
The method of distribution solves the problems, such as the measurement error as caused by the separation arrangement of heat source and measuring point in the prior art.
The operating procedure of technical solution of the present invention is as follows:
(1) the first heatflow meter sensor, sheetlike plane heat source, the second heatflow meter sensor are arranged in order and make its phase
It mutually fits closely, is arranged in parallel with measured material surface in material internal；
(2) recording stable and equally distributed temperature in measured material is initial temperature T_{0}；
(3) heater circuit is connected, the sheetlike plane heat source that area A, constant heat generation power are Q generates total heat in material
Stream is denoted asMeet relationship
(4) temperature and hotfluid that sheetlike plane heat source side is measured by the first heatflow meter sensor, are denoted as T_{1}WithBy
Two heatflow meter sensors measure the temperature and hotfluid of the sheetlike plane heat source other side, are denoted as T_{2}With
(5) initial temperature is subtracted by the first heatflow meter sensor temperature measurement data, obtains sheetlike plane heat source side heatflow meter
Temperature rise Δ T is corresponded at Sensor_{1E}(t)；Initial temperature is subtracted by the second heatflow meter sensor temperature measurement data, it is flat to obtain sheet
Temperature rise value Δ T is corresponded at the heatflow meter sensor measuring point of the plane heat source other side_{2E}(t)；
(6) the sheetlike plane heat source two sides hotfluid measured according to step (4)WithDetermine total hotfluidAlong sheetlike plane
The distribution coefficient f of heat source two sides_{i}, i.e.,In conjunction with the one dimensional heat transfer of transient state flat heat source
Process Heat Conduction Differential Equations, boundary condition and primary condition obtain sheetlike plane heat source two layers of material in heatflow meter sensor
Position is in the temperature rise analytic solutions Δ T in the t time_{1}(t) and Δ T_{2}(t)；
Temperature rise analytic solutions Δ T of the sheetlike plane heat source two layers of material in heatflow meter sensor position_{1}(t) and Δ T_{2}(t) lead
The hot differential equation, boundary condition and primary condition meet:
T=0, T_{i}=T_{0} (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd
Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89112 obtains being measured and monitored the growth of standing timber
Expect x=l_{i}The temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheetlike plane heat source two sides, is sheetlike plane heat source side measuring point when i=1, and when i=2 is
Sheetlike plane heat source other side measuring point；T_{i}For the temperature of measured material, K；T_{0}For the initial temperature of measured material, K；λ is to be measured and monitored the growth of standing timber
The thermal coefficient of material, Wm^{1}K^{1}；ρ is the density of measured material, kgm^{3}；C is the specific heat capacity of measured material, Jkg^{1}K^{1}；ρ c is quilt
Measure and monitor the growth of standing timber the heat capacity of volume (Jm of material^{3}K^{1})；f_{i}For the total hotfluid determined by heatflow meter sensorAlong sheetlike plane heat source two sides
Distribution coefficient, i.e., For sheetlike plane heat source total hotfluid, W/m^{2}；l_{i}For sheet
Parallel distance of the flat heat source measuring point to measured material surface, m；α is the thermal diffusivity of measured material, m^{2}/s；
(7) the temperature rise value Δ T of middle the surveyed sheetlike plane heat source two sides of comparison step (5)_{1E}(t)、ΔT_{2E}(t) with step (6)
The temperature rise analytic solutions Δ T of middle corresponding position measuring point_{1}(t)、ΔT_{2}(t), the thermal physical property parameter in transform analysis solution surveys experiment
The temperature rise difference value of temperature rise and temperature rise analytic solutions is minimum or in acceptable thresholds, obtains leading for sheetlike plane heat source two sides at this time
The numerical value of hot coefficient lambda, heat capacity of volume ρ c and thermal diffusivity α；
(8) according to the onetoone relationship of the volumetric heat capacity ρ c of measured material and the heterogeneous content of measured material, sheet is calculated
The heterogeneous content of flat heat source two layers of material；
(9) since each test data can only represent the heterogeneous content in the limited transmitting thickness of Transient Heat Transfer, with interval distance
From d_{i}It arranges measuring point, repeats step (1)~(8) and heterogeneous content measurement is carried out to different measuring points, according to gained point position and right
The heterogeneous content answered carries out data processing to institute's measured data by data processing software, obtains material according to specific measurement request
The nonhomogeneous heterogeneous content distribution of certain dimension in expecting.
May determine that whether the heterogeneous content distribution in sheetlike plane heat source two sides is uniform by step (4): when
When, heterogeneous content distribution is uniform at material measuring point at left and right sides of sheetlike plane heat source；WhenWhen, sheetlike plane heat source is left
Heterogeneous content distribution is uneven at right two layers of material measuring point.
In step (9) when design point layout scheme, defined by the penetration thickness of thermal perturbation in thermal conduction study in the material
It is found that the thermal perturbation at sheetlike plane heat source can only transmit limited thickness in measured material within a certain period of time, and herein
Material area other than thickness keeps original state, therefore arranges inside measured material and should ensure that in penetration thickness when measuring point
At least one measuring point, avoids in measured material that there are measurement blind area, the arrangement spacing d of measuring point_{i}It should meet:
Wherein；τ is the duration of single measurement heat source fever, s；It is poor with the temperature rise of temperature rise analytic solutions that α rises for experiment institute's thermometric
Different thermal diffusivity value minimum or be calculated in acceptance threshold, m^{2}/s。
In step (9) when design point layout scheme can according to the specific requirement of heterogeneous distribution measuring in measured material into
Row various dimensions point layout simultaneously records point position parameter, corresponding to obtain in measured material heterogeneous onedimensional, plane or threedimensional point
Cloth.
Data processing in step (9) is carried out at interpolation to the heterogeneous content of the resulting multiple groups of measurement and corresponding position parameter
Reason, passes through the input data in data processing software and writes corresponding interpolation processing program, can get heterogeneous in measured material contain
The onedimensional, plane of amount or threedimensional distribution situation can be fitted to obtain in measured material heterogeneous content with measuring point position according to interpolation result
Set the fitting function X of variation_{w}And its distribution:
X_{w}=(x, y, z, x_{w}) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m；x_{w}For measuring point position
It sets parameter and corresponds to heterogeneous content.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
Beneficial effects of the present invention: the present invention is due to being provided with sheet type heatflow meter sensing in sheetlike plane heat source two sides
Device, heatflow meter sensor can measure hotfluid and temperature simultaneously, pass through the temperature rise of sheetlike plane heat source two layers of material and hotfluid point
Match, effectively recognize heterogeneous uneven distribution, while compared with previous measurement method, realizes oneshot measurement and obtain heat source two sides
The heterogeneous content of material.It can be obtained onedimensional, flat in measured material using Transient Heat Transfer limited thickness as arranged for interval test position
The heterogeneous content spatial distribution of face or solid.Further, since sheet heat source is bonded arrangement with heatflow meter, previous calorifics side is avoided
The measurement error as caused by the separation arrangement of heat source and measuring point in method, heat source needed for reducing acquisition effectively detection temperature rise are sent out
Heat.By converting the measurement position of heat source and heatflow meter sensor, and with the Limited propagation of thermal perturbation with a thickness of between space
Every to measure distribution of the heterogeneous content in space.The it is proposed of the method for the present invention solves nonequal in measurement porous material
One heterogeneous content and its problem of distribution.
Detailed description of the invention
Fig. 1 is that the measuring probe of heterogeneous content and its method of distribution shows in a kind of measurement porous material provided by the invention
It is intended to；In figure: 1 is sheetlike plane heat source；2 first heatflow meter sensors；3 second heatflow meter sensors；4 measured materials；l_{1}And l_{2}
Respectively parallel distance of the sheetlike plane heat source apart from measured material or so surface, m；U is the voltage for being supplied to heater, V；
Fig. 2 is that the point layout of heterogeneous content and its method of distribution is former in a kind of measurement porous material provided by the invention
Reason figure, point layout spacing d_{i}, m；τ is testing time, s；α_{1}、α_{2}Institute's thermometric is tested for heat source two sides to rise and temperature rise analytic solutions
Temperature rise difference value minimum or the obtained thermal diffusivity in acceptable thresholds, m^{2}/s；f_{1}、f_{2}It is distributed for the hotfluid of heat source two sides
Coefficient；For sheetlike plane heat source total hotfluid, W/m^{2}；N=1,2,3, n is measuring point number；
Fig. 3 is the operating process of heterogeneous content and its method of distribution in a kind of measurement porous material provided by the invention
Figure；In figure: T_{1}、And T_{1}、The temperature and hotfluid generated at left and right sides of it for sheetlike plane heat source；f_{i}To be passed by heatflow meter
Total hotfluid determined by sensorDistribution coefficient along sheetlike plane heat source two sides, and f_{1}+f_{2}=1；It is total for sheetlike plane heat source
Hotfluid, W/m^{2}；ΔT_{1E}(t) and Δ T_{2E}It (t) is the temperature rise of sheetlike plane heat source two layers of material；ΔT_{1}(t) and Δ T_{2}It (t) is sheet
Temperature rise analytic solutions of the flat heat source two layers of material within the t time；D rises the difference of temperature rise approximate with analytic solutions for sensor institute's thermometric
Value；D_{accept}For acceptable difference value threshold value；τ is the fever duration of single measurement heat source, s；α rises and temperature for experiment institute's thermometric
Rise analytic solutions temperature rise difference value is minimum or the thermal diffusivity that is calculated in acceptable thresholds, m^{2}/s。
Specific embodiment
Embodiments of the present invention are illustrated by taking the measurement of the moisture content of moisture retentive heat insulation material as an example below.
Heterogeneous content and its method of distribution in a kind of measurement porous material, steps are as follows:
(1) moisture retentive heat insulation material 4 is arranged in weak heat exchange environment, while by the first heatflow meter sensor 2, sheetlike plane
Heat source 1, the second heatflow meter sensor 3 are arranged and are fitted closely according to Fig. 1 sequence, are arranged in parallel with 4 surface of measured material in material
Material is internal, and the parallel distance on sheetlike plane heat source and measured material or so surface is respectively l_{1}And l_{2}.It is recommended that selecting sheet type sheet
Flat heat source, sheet sheet type heatflow meter sensor, while sheet type heatflow meter sensor area size is flat much smaller than formula sheet
The area size of plane heat source.
(2) after waiting the uniformity of temperature profile of moisture retentive heat insulation material to stablize, the initial temperature T of record measurement initial time_{0}；
(3) heater circuit is connected, the sheetlike plane heat source that area A, constant heat generation power are Q generates total heat in material
Stream is denoted asMeet relationship
(4) temperature and hotfluid that sheetlike plane heat source side is measured by the first heatflow meter sensor, are denoted as T_{1}WithBy
Two heatflow meter sensors measure the temperature and hotfluid of the sheetlike plane heat source other side, are denoted as T_{2}With
(5) initial temperature is subtracted by the first heatflow meter sensor temperature measurement data, obtains sheetlike plane heat source side heatflow meter
Temperature rise Δ T is corresponded at Sensor_{1E}(t)；Initial temperature is subtracted by the second heatflow meter sensor temperature measurement data, it is flat to obtain sheet
Temperature rise value Δ T is corresponded at the heatflow meter sensor measuring point of the plane heat source other side_{2E}(t)；
(6) the sheetlike plane heat source two sides hotfluid measured according to step (4)WithDetermine total hotfluidAlong sheetlike plane
The distribution coefficient f of heat source two sides_{i}, in conjunction with the one dimensional heat transfer process Heat Conduction Differential Equations of transient state flat heat source, boundary condition and
Primary condition obtains sheetlike plane heat source two sides in heatflow meter sensor position in the temperature rise analytic solutions Δ T in the t time_{1}(t) and
ΔT_{2}(t)；
Temperature rise analytic solutions Δ T of the sheetlike plane heat source two layers of material in heatflow meter sensor position_{1}(t) and Δ T_{2}(t) lead
The hot differential equation, boundary condition and primary condition meet:
T=0, T_{i}=T_{0} (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd
Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89112 obtains being measured and monitored the growth of standing timber
Expect x=l_{i}The temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheetlike plane heat source two sides, is sheetlike plane heat source side measuring point when i=1, and when i=2 is
Sheetlike plane heat source other side measuring point；T_{i}For the temperature of measured material, K；T_{0}For the initial temperature of measured material, K；λ is to be measured and monitored the growth of standing timber
The thermal coefficient of material, Wm^{1}K^{1}；ρ is the density of measured material, kgm^{3}；C is the specific heat capacity of measured material, Jkg^{1}K^{1}；ρ c is quilt
Measure and monitor the growth of standing timber the heat capacity of volume (Jm of material^{3}K^{1})；f_{i}For the total hotfluid determined by heatflow meter sensorAlong sheetlike plane heat source two sides
Distribution coefficient, i.e., For sheetlike plane heat source total hotfluid, W/m^{2}；l_{i}It is flat for sheet
Parallel distance of the plane heat source measuring point to measured material surface, m；α is the thermal diffusivity of measured material, m^{2}/s；
(7) difference value of actual measurement temperature rise and temperature rise analytic solutions obtained by step (5) and step (6) is calculated using formula (8),
Wherein, D is the root mean square difference value (DEG C) of the temperature rise calculated and actual measurement temperature rise, Δ T_{M,t}To be calculated by formula
The temperature rise value (DEG C) of the t moment arrived, Δ T_{E,t}For by the temperature rise value (DEG C) for testing the t moment measured, n is the temperature that experiment measures
Spend data number.Oneshot measurement includes two groups of temperature rise data in the present invention, respectively corresponds the temperature at left and right sides of sheetlike plane heat source
It rises, therefore calculates corresponding D value at left and right sides of sheetlike plane heat source.
(8) it is optimized using Matlab Optimization Toolbox, passes through the thermally conductive system of Proper Match moisture retentive heat insulation material
Number λ and volumetric heat capacity ρ c and thermal diffusivity α, is arranged acceptable deviation D_{accept}, so that sensor institute's thermometric liter is close with analytic solutions
Meet D≤D like the difference value relationship of temperature rise_{accept}；Wherein, if parameter, which matches, is limited to liquid so that porous material absorbs moisture as an example
The thermal coefficient λ and volumetric heat capacity ρ c of state water, matching lower limit are thermal coefficient λ and volumetric heat capacity the ρ c of dry thermal insulation material.
(9) according to obtain Optimum Matching in step (8) as a result, determine absorb it is heterogeneous after porous material thermal coefficient λ and
The numerical value of volumetric heat capacity ρ c, according to volumetric heat capacity and the onetoone relationship of heterogeneous content, be absorbed heterogeneous rear porous material
Heterogeneous content, such as the water content in thermal insulation material:
Wherein, x_{w}For the volume fraction of moisture, ρ_{dry}For the density (kgm of dry thermal insulation material^{3}), c_{dry}For dry thermal insulating material
Expect specific heat capacity (Jkg^{1}K^{1}), ρ_{dry}c_{dry}For the heat capacity of volume (Jm of dry thermal insulation material^{3}·K^{1}), c_{w}For the specific heat capacity of moisture
(Jkg^{1}K^{1}), ρ c is the resulting volumetric heat capacity (Jm of Optimum Matching^{3}·K^{1})。
(10) point layout and record position parameter of onedimensional or plane or solid are carried out in material, Fig. 2 is measuring point cloth
Schematic diagram is set, is defined by the penetration thickness of thermal perturbation in thermal conduction study in the material it is found that sheetlike plane is warm within a certain period of time
Thermal perturbation at source can only transmit limited thickness in measured material, and the material area other than this thickness keeps initial shape
State, therefore arranged inside measured material and should ensure that at least one measuring point in penetration thickness when measuring point, avoid measured material
Inside there is measurement blind area, the arrangement spacing d of measuring point_{i}It should meet:
Wherein；τ is the fever duration of single measurement heat source, s；It is poor with the temperature rise of temperature rise analytic solutions that α rises for experiment institute's thermometric
Different thermal diffusivity value minimum or be calculated in acceptance threshold, m^{2}/s；
(11) step (1)~(9) are repeated, the moisture content at available each measuring point two sides are repeatedly measured, by right
The data obtained carries out interpolation processing, can obtain the moisture content distribution of certain dimension material Nei.
It is as follows that the used program of numerical interpolation processing is carried out by Matlab:
Uiopen (' data file path ', 1)
[X,Y,Z X_{w}]=griddata (x, y, z, x_{w},linspace(0,900,100)',linspace(0.4,5,
100), ' linear') % range
pcolor(X,Y,Z,X_{w})；Shading interp% pseudocolour picture
hold on
scatter(x,y,z'r')
text(x,y,z,arrayfun(@(x_{w})[”num2str(x_{w})],x_{w}, ' UniformOutput', 0)) % label survey
Point position and heterogeneous content
H=gca；The pointer of % acquisition present figure coordinate
set(h,'FontSize',16)；Text size is arranged in %
(12) it is fitted to obtain the fitting function X that heterogeneous content changes with point position according to data_{w}And its distribution:
X_{w}=(x, y, z, x_{w}) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m；x_{w}For measuring point position
Set corresponding heterogeneous content.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to abovementioned specific implementations
Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention
Within protection.
Claims (5)
1. heterogeneous content and its method of distribution in a kind of measurement porous material, which is characterized in that step are as follows:
(1) the first heatflow meter sensor, sheetlike plane heat source, the second heatflow meter sensor are arranged in order and keep it mutually tight
Closely connected conjunction is arranged in parallel with measured material surface in material internal；
(2) recording stable and equally distributed temperature in measured material is initial temperature T_{0}；
(3) heater circuit is connected, the sheetlike plane heat source that area A, constant heat generation power are Q generates total hotfluid note in material
ForMeet relationship
(4) temperature and hotfluid that sheetlike plane heat source side is measured by the first heatflow meter sensor, are denoted as T_{1}WithBy the second heat
Flowmeter sensor measures the temperature and hotfluid of the sheetlike plane heat source other side, is denoted as T_{2}With
(5) initial temperature is subtracted by the first heatflow meter sensor temperature measurement data, obtains sheetlike plane heat source side heatflow meter sensing
Temperature rise Δ T is corresponded at device measuring point_{1E}(t)；Initial temperature is subtracted by the second heatflow meter sensor temperature measurement data, obtains sheetlike plane heat
Temperature rise value Δ T is corresponded at the heatflow meter sensor measuring point of the source other side_{2E}(t)；
(6) the sheetlike plane heat source two sides hotfluid measured according to step (4)WithDetermine total hotfluidAlong sheetlike plane heat source
The distribution coefficient f of two sides_{i}, i.e.,In conjunction with the one dimensional heat transfer process of transient state flat heat source
Heat Conduction Differential Equations, boundary condition and primary condition obtain sheetlike plane heat source two layers of material in heatflow meter sensor position
In the temperature rise analytic solutions Δ T in the t time_{1}(t) and Δ T_{2}(t)；
Temperature rise analytic solutions Δ T of the sheetlike plane heat source two layers of material in heatflow meter sensor position_{1}(t) and Δ T_{2}(t) thermally conductive micro
Equation, boundary condition and primary condition is divided to meet:
T=0, T_{i}=T_{0} (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd
Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89112 obtains being measured and monitored the growth of standing timber
Expect x=l_{i}The temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheetlike plane heat source two sides, is sheetlike plane heat source side measuring point when i=1, and when i=2 is sheet
Flat heat source other side measuring point；T_{i}For the temperature of measured material, K；T_{0}For the initial temperature of measured material, K；λ is measured material
Thermal coefficient, Wm^{1}K^{1}；ρ is the density of measured material, kgm^{3}；C is the specific heat capacity of measured material, Jkg^{1}K^{1}；ρ c is to be measured and monitored the growth of standing timber
Heat capacity of volume (the Jm of material^{3}K^{1})；f_{i}For the total hotfluid determined by heatflow meter sensorPoint along sheetlike plane heat source two sides
Distribution coefficient, i.e., For sheetlike plane heat source total hotfluid, W/m^{2}；l_{i}For sheetlike plane
Parallel distance of the heat source measuring point to measured material surface, m；α is the thermal diffusivity of measured material, m^{2}/s；
(7) the temperature rise value Δ T of middle the surveyed sheetlike plane heat source two sides of comparison step (5)_{1E}(t)、ΔT_{2E}(t) with it is right in step (6)
Answer the temperature rise analytic solutions Δ T of position measuring point_{1}(t)、ΔT_{2}(t), the thermal physical property parameter in transform analysis solution makes to test institute's thermometric liter
With the temperature rise difference value minimum of temperature rise analytic solutions or in acceptable thresholds, the thermally conductive system of sheetlike plane heat source two sides is obtained at this time
The numerical value of number λ, heat capacity of volume ρ c and thermal diffusivity α；
(8) according to the onetoone relationship of the volumetric heat capacity ρ c of measured material and the heterogeneous content of measured material, sheetlike plane is calculated
The heterogeneous content of heat source two layers of material；
(9) since each test data can only represent the heterogeneous content in the limited transmitting thickness of Transient Heat Transfer, with spacing distance d_{i}Cloth
It sets measuring point, repeats step (1)~(8) and heterogeneous content measurement is carried out to different measuring points, according to gained point position and corresponding different
Matter content, carries out data processing to institute's measured data by data processing software, obtains certain in material according to specific measurement request
The nonuniform heterogeneous content distribution of dimension.
2. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that logical
Crossing step (4) may determine that whether the heterogeneous content distribution in sheetlike plane heat source two sides is uniform: whenWhen, sheet is flat
Heterogeneous content distribution is uniform at material measuring point at left and right sides of plane heat source；WhenWhen, sheetlike plane heat source left and right sides material
Expect that heterogeneous content distribution is uneven at measuring point.
3. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step
Suddenly it is defined by the penetration thickness of thermal perturbation in thermal conduction study in the material it is found that certain when design point layout scheme in (9)
Thermal perturbation in time at sheet flat heat source can only transmit limited thickness in measured material, and the material other than this thickness
Expect that region keeps original state, therefore is arranged inside measured material and should ensure that at least one is surveyed in penetration thickness when measuring point
Point, avoids in measured material that there are measurement blind area, the arrangement spacing d of measuring point_{i}It should meet:
Wherein；τ is the duration of single measurement heat source fever, s；α rises the temperature rise difference value with temperature rise analytic solutions for experiment institute's thermometric
Thermal diffusivity minimum or being calculated in acceptance threshold, m^{2}/s。
4. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step
Suddenly various dimensions survey can be carried out in measured material according to the specific requirement of heterogeneous distribution measuring when design point layout scheme in (9)
Point, which is arranged, simultaneously records point position parameter, corresponding to obtain heterogeneous onedimensional, plane or threedimensional distribution in measured material.
5. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step
Suddenly the data processing in (9) be to measuring the heterogeneous content of resulting multiple groups and corresponding position parameter carries out interpolation processing, by
Input data and write corresponding interpolation processing program in data processing software, can get heterogeneous content in measured material it is onedimensional,
Plane or threedimensional distribution situation can be fitted to obtain in measured material heterogeneous content according to interpolation result and intend with what point position change
Close function X_{w}And its distribution:
X_{w}=(x, y, z, x_{w}) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m；x_{w}For point position ginseng
The corresponding heterogeneous content of number.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
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