CN212904622U - Device for measuring heterogeneous content in porous material with limited thickness - Google Patents
Device for measuring heterogeneous content in porous material with limited thickness Download PDFInfo
- Publication number
- CN212904622U CN212904622U CN202020830805.XU CN202020830805U CN212904622U CN 212904622 U CN212904622 U CN 212904622U CN 202020830805 U CN202020830805 U CN 202020830805U CN 212904622 U CN212904622 U CN 212904622U
- Authority
- CN
- China
- Prior art keywords
- heat flow
- probe
- thermal excitation
- power supply
- heating sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a device for measuring heterogeneous content in a porous material with limited thickness, which comprises a thermal excitation side probe, a heat insulation boundary side probe, a variable pressure controller, a data acquisition device and a computer data processing system; the thermal excitation side probe comprises a temperature measurement heating sheet, a temperature sensor, a thermal excitation side heat flow probe, a thermal excitation side heating sheet and the like; the heat insulation boundary side probe comprises a heat insulation boundary side heat flow probe, a heat insulation boundary side heating sheet and the like; the variable-voltage controller is provided with a main controller, a heat flow data processing and variable-voltage power supply module, a power supply and other structures. The utility model provides a two kinds of probes arrangement form: 1, a thermal excitation side probe and a thermal insulation boundary side probe are correspondingly arranged on two sides of a material to be measured; and 2, the two thermal excitation side probes are symmetrically arranged on two sides of the material to be detected. The utility model discloses owing to use the method of carrying out heat flow compensation control, arranging the symmetrical heat source in the border department of being surveyed the material, created adiabatic border, the thickness requirement to being surveyed the material reduces by a wide margin.
Description
Technical Field
The utility model belongs to material detection and analysis field relates to a measure device of heterogeneous content among finite thickness porous material based on unsteady state heat conduction principle of plane heat source.
Background
The invasion of heterogeneous components in the porous material can change the characteristics of the material, greatly reduce the heat preservation and noise elimination performance of the material, induce the phenomena of mildew, corrosion and the like, and further shorten the service life of the material. The measurement of heterogeneous content in porous materials is an extremely necessary means and technique. The measurement of heterogeneous content of materials, especially the measurement method of water content of materials and related research are more, but all have certain theoretical and use limitations. The existing measurement methods generally calculate the heterogeneous content in the measured material by measuring other physical quantities having a certain corresponding relationship with the content of the heterogeneous component in the porous material, and can be divided into an electrical method, a thermal method, a radiation method and the like according to different measurement principles. Thermal methods have been widely studied because of their characteristics such as simplicity, low cost, and insensitivity to the salt content in water. The thermal method calculates the heterogeneous content in the material to be measured according to the temperature dynamic response signal of a certain fixed position of a linear or columnar heat source with the measuring distance arranged in the material to be measured.
Most of the current researches are to measure heterogeneous content of the porous material by using a thermal pulse method and a hot plate method based on a thermal method. The thermal pulse method analyzes and resolves the temperature field of the line heat source instantaneously acting on the infinite uniform medium, and calculates the volume heat capacity value by using the maximum temperature rise obtained by the temperature sensor, so as to obtain the heterogeneous content. The hot plate method is characterized in that a linear heat source arranged in a double-helix manner is analyzed and solved in a temperature field of an infinite uniform medium under the action of constant power in a plane, and the temperature change of the linear heat source is obtained by using the resistance value change of a resistor of the linear heat source to calculate the volume heat capacity value, so that the heterogeneous content is obtained. The two methods use infinite homogeneous medium hypothesis as theoretical formulas, and can only be used under the conditions that the external dimension of the material to be detected is large enough and no heat dissipation exists at the boundary, so the actual application range is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a measure device of heterogeneous content among finite thickness porous material, solve among the prior art heterogeneous measuring equipment easily receive by survey material thickness and measurement environment influence, calorific capacity is big, can not arrange for a long time and measure the scheduling problem in being surveyed the material.
In order to achieve the above purpose, the technical scheme of the utility model is that:
an apparatus for measuring heterogeneous content in a porous material with limited thickness, comprising two arrangements:
the first arrangement form comprises a thermal excitation side probe, a heat insulation boundary side probe, a variable pressure controller, a data acquisition device and a computer data processing system; the second arrangement mode comprises two sets of thermal excitation side probes, a variable voltage controller, a data acquisition device and a computer data processing system;
in the first arrangement form, the thermal excitation side probe and the thermal insulation boundary side probe are respectively arranged at two sides of the measured porous material, the center positions of the thermal excitation side probe and the thermal insulation boundary side probe are kept consistent, and the projections along the thickness direction of the measured material are overlapped. In the second arrangement form, two identical thermal excitation side probes are symmetrically arranged on two sides of the measured material, and projections along the thickness direction of the measured material are overlapped.
The thermal excitation side probe comprises a temperature measurement heating sheet, a temperature sensor, a thermal excitation side heat flow probe, a thermal excitation side heating sheet, a power supply and the like. The temperature sensor, the temperature measuring heating sheet, the thermal excitation side heat flow probe and the thermal excitation side heating sheet are tightly attached in sequence to form a thermal excitation side probe main body part.
The adiabatic boundary side probe includes an adiabatic boundary side heat flow probe, an adiabatic boundary side heat-generating sheet, a power supply, and the like. The heat insulation boundary side heat flow probe and the heat insulation boundary side heating sheet are closely attached to form a heat insulation boundary side probe body part.
The variable-voltage controller is provided with a main controller, a heat flow data processing and variable-voltage power supply module, a power supply and other structures. The main controller is directly connected with a power supply and a heat flow data processing and voltage transformation power supply module. The heat flow data processing and variable voltage power supply module processes heat flow signals transmitted by the thermal excitation side heat flow probe and the thermal insulation boundary side heat flow probe and transmits the heat flow signals to the main controller. The main controller transmits control signals for controlling the heating power of the thermal excitation side heating sheet and the thermal insulation boundary side heating sheet through the heat flow data processing and variable voltage power supply module.
The main controller is used for controlling the power supply voltage of the thermal excitation heating sheet and the thermal insulation boundary side heating sheet, so that the heat flow value of the thermal excitation side heat flow probe and the thermal insulation boundary side heat flow probe is zero. The heat flow data processing and variable voltage power supply module controls the power supply voltage of the thermal excitation side heating sheet and the thermal insulation boundary side heating sheet according to the instruction of the main controller; and the heat flow data processing and variable voltage power supply module processes the incoming signals of the heat flow probe and feeds the processed signals back to the main controller.
The thermal excitation side probe maintains the thermal current value measured by the thermal current probe to be zero by adjusting the heat productivity of the thermal excitation side heating sheet. The temperature measuring heating sheet heats with constant power, and all the heat is transferred to the material to be measured.
The heat flow value of the heat flow probe on the heat insulation boundary side is maintained to be zero by adjusting the heat productivity of the heat-generating sheet on the heat insulation boundary side, so that the boundary of the detected material is heat-insulated.
The thermal excitation side probe and the thermal insulation boundary side probe are consistent in shape, are sheet-shaped, have certain rigidity, and are tightly attached to the boundary of the porous material to be detected.
The temperature sensor is a thermocouple or a thermal resistor. In order to obtain the average temperature of the surface of the heating sheet at the temperature measuring end, one or more temperature sensors may be arranged on the heating sheet.
The method for measuring heterogeneous content by using the device comprises the following steps:
a. measuring the thickness delta of the measured material;
b. arranging the device on two sides of the material to be tested;
c. after the temperature field distribution in the material to be detected is stable, switching on a heating circuit, and starting a variable voltage controller and a data acquisition device;
d. the temperature sensor detects the temperature rise of the surface of the temperature-measuring heating sheet, and the data acquisition device records the temperature rise and transmits the measurement result to the computer;
e. the computer solves the change rate of the temperature rise along with the time, finishes the measurement and records the change rate after the change rate is stable, and closes the heating circuit, the variable voltage controller and the data acquisition device;
f. and calculating thermophysical parameters by using the recorded temperature rise change rate and calculating to obtain heterogeneous content.
Compare with heterogeneous content method and device in the current unsteady state calorifics method measured material, the beneficial effects of the utility model are that:
1. the sensor probe can be arranged at the position of a material to be detected for a long time and is directly attached to the surface of the material to be detected, so that the material to be detected cannot be damaged, and remote online monitoring is realized;
2. the heat insulation boundary is manufactured by controlling the heat productivity of the heating sheet at the compensation end, so that the plate-shaped material with a relatively thin thickness can be accurately measured;
3. the thermal excitation side probe and the thermal insulation boundary side probe are of multilayer structures, are not easy to deform, and are beneficial to reducing errors caused by distance change between the heating sheet and the temperature sensor or appearance change of the probes in the using process.
4. The calculation method for calculating the heterogeneous content based on the temperature rise rate instead of the temperature value can eliminate the interference of contact thermal resistance on the test, can realize long-term remote online heterogeneous content monitoring, and is simple and quick in measurement method.
The utility model discloses in being applied to the test of heterogeneous content among the finite thickness porous material with plane heat source unsteady state heat conduction principle and additional heat source manufacturing adiabatic boundary principle, test sensor arranges in outside being surveyed the material, can realize the probe non-invasively ground not damaged measurement. The utility model discloses taken and arranged heating element and temperature sensor in integrative design, prevented the deformation problem that probably exists between heating element and temperature sensor. The integrated arrangement mode enables the heating power required by the heating sheet to be smaller, and the interference of convection and radiation heat transfer in the porous material to the test result can be reduced. The probe of the measuring equipment has compact structure and small occupied volume, does not need other auxiliary equipment, and can be applied to various narrow test environments.
Drawings
Fig. 1 is a schematic diagram of a heterogeneous component detection sensor of a porous material with a limited thickness based on the unsteady state heat conduction principle of a planar heat source according to the present invention; FIG. 1(a) is a thermal excitation side probe, and FIG. 1(b) is an adiabatic interface side probe; in the figure; 1 is a power supply; 2 is a thermal excitation side heating sheet; 3 is a heat excitation end heat flow probe; 4 is a temperature measuring heating sheet; 5 is a temperature sensor; 6 is an adiabatic boundary side heat flow probe; 7 is a heat-insulating boundary side heating film sheet;
FIG. 2 is a schematic view of two arrangement forms of probes of the heterogeneous component detection sensor of the porous material with limited thickness provided by the present invention; FIG. 2(a) is a first arrangement and FIG. 2(b) is a second arrangement; in the figure; 8 is a thermal excitation side probe; 9 is a heat insulation interface side probe; 10 is a material to be detected; 11 is a variable voltage controller;
fig. 3 is a schematic view of the internal working principle of the voltage transformation controller provided by the present invention;
fig. 4 is a flow chart of the operation when the utility model is used for measuring heterogeneous components.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the device for measuring heterogeneous content in porous material of the present invention comprises a thermal excitation side probe, a thermal insulation boundary side probe and a variable pressure controller;
the thermal excitation end probe comprises a temperature sensor 3, a temperature measurement heating sheet 4, a thermal excitation side heat flow probe 2 and a thermal excitation side heating sheet 1, and the thermal excitation end probe and the thermal excitation side heat flow probe are tightly attached from inside to outside. The measurement result of the temperature sensor 3 is transmitted to a data acquisition unit, the temperature measurement heating sheet 4 is connected with a constant voltage power supply, and the thermal excitation side heat flow probe 2 and the thermal excitation side heating sheet 1 respectively transmit signals with a variable voltage controller;
the heat insulation boundary side probe comprises a heat insulation boundary side heat flow probe 5 and a heat insulation boundary side heating film 6, and is in signal transmission with the variable pressure controller;
the variable-voltage controller is provided with a main controller, a heat flow data processing and variable-voltage power supply module, a power supply and other structures.
The utility model provides a method for determining heterogeneous content of finite thickness porous material based on a thermal method, comprising the following steps:
a. the measuring probes of the device are arranged on two sides of a measured material according to the figure 1, so that the measuring probes are in close contact with the surface of the measured material, and the thickness of the measured material is measured.
b. And standing the measured material with the arranged measuring probe for a period of time, switching on a heating circuit after the temperature distribution is uniform, starting the variable voltage controller and the data acquisition unit, and starting the test. The thermometric heating sheet generates heat at a constant power, and in the first arrangement, the main controller controls the thermal excitation side heating sheet and the adiabatic boundary side heating sheet to generate heat at a varying power, and in the second arrangement, the main controller controls the two thermal excitation side heating sheets to generate heat at a varying power.
c. The temperature sensor detects the temperature rise of the surface of the temperature-measuring heating diaphragm, and the data acquisition device records the temperature rise and transmits the measurement result to the computer.
d. The computer solves the change rate of the temperature rise along with the heating time, finishes measuring and recording the change rate after the change rate is stable, and closes the heating circuit, the variable-voltage controller and the data acquisition device;
e. calculating volumetric heat capacity of the measured material by using the recorded change rate
The method for calculating the volumetric heat capacity of the measured material is as follows, and the one-dimensional heat conduction differential equation, the boundary condition and the initial condition corresponding to the testing device provided by the utility model are as follows:
when in use
When in use
When T is 0, T is T0 (4)
Wherein T is the temperature of any point in the porous material to be detected, and K; t is0Is the initial temperature, K, of the porous material to be measured; lambda is the thermal conductivity coefficient of the porous material to be measured, Wm-1K-1(ii) a ρ is quiltMeasuring the density, kgm, of the porous material-3(ii) a c is the specific heat capacity of the porous material to be measured, Jkg-1K-1(ii) a ρ c is the volumetric heat capacity of the porous material to be measured, Jm-3K-1；
W/m of heat flux density of heating sheet at temperature measuring end2(ii) a Q is the total input power of the heating sheet at the temperature measuring end, W; a is the area of the heating sheet at the temperature measuring end, m2(ii) a l is the distance between the constant heat flow boundary and the adiabatic boundary, m. In a first arrangement, l is δ, and in a second arrangement, l is δ/2; where δ is the thickness of the material being measured.
The partial differential equation set is solved by referring to the method in H.S. Carlslaw, J.C. Jaeger.connection of Heat in solids.2nd edition.Oxford Clarendon Press,1986:89-112, and the temperature rise of the tested porous material at the constant Heat flow boundary x ═ l is resolved as follows:
wherein α is thermal diffusivity, m2S; the time term t is derived from equation (5),
when t is sufficiently large, equation (6) can be simplified to
Namely, when the heating time t is large enough, the change rate of the temperature rise along with the time has a linear relation with the reciprocal of the volumetric heat capacity rho c of the tested porous material. The volumetric heat capacity ρ c can be calculated using the rate of change in temperature with time.
f. And calculating the volume fraction of the heterogeneous content by a preset calculation program according to the one-to-one correspondence relationship between the volume heat capacity rho c and the heterogeneous content. The volumetric heat capacity is related to the heterogeneous content as follows:
ρdrycdry+ρwcwxw＝ρc (8)
where ρ isdryThe dry density (kgm) of the tested porous material before heterogeneous invasion-3)，cdryThe dry specific heat capacity (Jkg) of the tested porous material before heterogeneous invasion-1K-1)，ρdrycdryThe volume heat capacity (Jm) of the porous material to be tested when dried before the invasion of the heterogeneous material-3·K-1)，ρwIs the density (kgm) of pure heterogeneous components-3)，cwSpecific heat capacity (Jkg) of pure heterogeneous composition-1K-1)，ρwcwVolumetric heat capacity (Jm) as a purely heterogeneous component-3·K-1)，xwVolume fraction of pure heterogeneous component, ρ c is the volumetric heat capacity (Jm) of the porous material to be tested-3·K-1)；
According to the difference of the volumetric heat capacities before and after the intrusion of the heterogeneous material of the porous material to be detected, the volume fraction of the content of the pure heterogeneous component is solved:
wherein x is heterogeneous content volume fraction.
The utility model discloses the thin slice that generates heat and thermal current probe and temperature sensor form the measuring probe who has certain rigidity after closely laminating, can arrange for a long time and carry out heterogeneous content measurement's finite thickness porous material both sides in needs. After the heating sheet at the temperature measuring end is electrified and heated, the variable-voltage controller controls the heating power of the heating sheet at the thermal excitation side and the heating sheet at the heat insulation boundary side to manufacture a boundary without heat flow passing. The temperature sensor measures the temperature rise response of the surface of the temperature measurement heating sheet, and the data collector collects measurement data and transmits the measurement data to the computer. And the computer calculates the heterogeneous content of the material to be detected according to a preset program. Because the method of carrying out heat flow compensation control and arranging the symmetrical heat source at the boundary of the material to be detected is used, a heat insulation boundary is created, and the requirement on the thickness of the material to be detected is greatly reduced; the heating element reduces the heating value, and can reduce the influence of convection heat transfer, radiation heat transfer or phase change of heterogeneous components on the measurement precision; the volumetric heat capacity of the measured material is calculated by using the change rate of the temperature rise along with the time, and the calculation is simple and convenient, and the measurement precision is high.
Claims (6)
1. A device for measuring heterogeneous content in a porous material with limited thickness is characterized by comprising a thermal excitation side probe, a thermal insulation boundary side probe, a variable pressure controller, a data acquisition device and a computer data processing system; the thermal excitation side probe and the thermal insulation boundary side probe are respectively arranged at two sides of the measured porous material, the central positions of the thermal excitation side probe and the thermal insulation boundary side probe are kept consistent, and the projections along the thickness direction of the measured material are superposed;
the thermal excitation side probe comprises a temperature measurement heating sheet, a temperature sensor, a thermal excitation side heat flow probe, a thermal excitation side heating sheet and a power supply; the temperature sensor, the temperature measuring heating sheet, the thermal excitation side heat flow probe and the thermal excitation side heating sheet are sequentially and tightly attached to form a thermal excitation side probe main body part;
the heat insulation boundary side probe comprises a heat insulation boundary side heat flow probe, a heat insulation boundary side heating sheet and a power supply; the heat insulation boundary side heat flow probe is tightly attached to the heat insulation boundary side heating sheet to form a heat insulation boundary side probe body part;
the variable-voltage controller comprises a main controller, a heat flow data processing and variable-voltage power supply module and a power supply; the main controller is directly connected with a power supply and a heat flow data processing and voltage transformation power supply module; the heat flow data processing and variable-voltage power supply module processes heat flow signals transmitted by the thermal excitation side heat flow probe and the thermal insulation boundary side heat flow probe and transmits the heat flow signals to the main controller; the main controller transmits control signals for controlling the heating power of the thermal excitation side heating sheet and the thermal insulation boundary side heating sheet through the heat flow data processing and variable voltage power supply module;
the main controller is used for controlling the power supply voltages of the thermal excitation heating sheet and the thermal insulation boundary side heating sheet, so that the heat flow values of the thermal excitation side heat flow probes and the thermal insulation boundary side heat flow probes are zero; the heat flow data processing and variable voltage power supply module controls the power supply voltage of the thermal excitation side heating sheet and the thermal insulation boundary side heating sheet according to the instruction of the main controller; and the heat flow data processing and variable voltage power supply module processes the incoming signals of the heat flow probe and feeds the processed signals back to the main controller.
2. The apparatus for measuring heterogeneous content in a porous material with limited thickness according to claim 1, wherein: the heat flow value of the heat flow probe on the heat insulation boundary side is maintained to be zero by adjusting the heat productivity of the heat-generating sheet on the heat insulation boundary side, so that the boundary of the detected material is heat-insulated.
3. A device for measuring heterogeneous content in a porous material with limited thickness is characterized by comprising two sets of thermal excitation side probes, a variable pressure controller, a data acquisition device and a computer data processing system; two identical thermal excitation side probes are symmetrically arranged on two sides of the measured material, and projections along the thickness direction of the measured material are superposed;
the thermal excitation side probe comprises a temperature measurement heating sheet, a temperature sensor, a thermal excitation side heat flow probe, a thermal excitation side heating sheet and a power supply; the temperature sensor, the temperature measuring heating sheet, the thermal excitation side heat flow probe and the thermal excitation side heating sheet are sequentially and tightly attached to form a thermal excitation side probe main body part;
the variable-voltage controller comprises a main controller, a heat flow data processing and variable-voltage power supply module and a power supply; the main controller is directly connected with a power supply and a heat flow data processing and voltage transformation power supply module; the heat flow data processing and voltage transformation power supply module processes heat flow signals transmitted by the thermal excitation side heat flow probe and transmits the heat flow signals to the main controller; the main controller transmits a control signal for controlling the heating power of the heating sheet at the thermal excitation side through the heat flow data processing and variable voltage power supply module;
the main controller is used for controlling the power supply voltage of the thermal excitation heating sheet, so that the heat flow value of the thermal excitation side heat flow probe is zero; the heat flow data processing and voltage transformation power supply module controls the power supply voltage of the heating sheet on the thermal excitation side according to the instruction of the main controller; and the heat flow data processing and variable voltage power supply module processes the incoming signals of the heat flow probe and feeds the processed signals back to the main controller.
4. The device for measuring heterogeneous content in a porous material of limited thickness according to claim 1 or 2, characterized in that: the thermal excitation side probe maintains the thermal flow value measured by the thermal flow probe to be zero by adjusting the heat productivity of the thermal excitation side heating sheet; the temperature measuring heating sheet heats with constant power, and all the heat is transferred to the material to be measured.
5. The device for measuring heterogeneous content in a porous material of limited thickness according to claim 1 or 2, characterized in that: the thermal excitation side probe and the thermal insulation boundary side probe are consistent in shape, are sheet-shaped, have certain rigidity, and are tightly attached to the boundary of the porous material to be detected.
6. The device for measuring heterogeneous content in a porous material of limited thickness according to claim 1 or 2, characterized in that: the temperature sensors are thermocouples or thermal resistors, and the number of the temperature sensors is one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020830805.XU CN212904622U (en) | 2020-05-18 | 2020-05-18 | Device for measuring heterogeneous content in porous material with limited thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020830805.XU CN212904622U (en) | 2020-05-18 | 2020-05-18 | Device for measuring heterogeneous content in porous material with limited thickness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212904622U true CN212904622U (en) | 2021-04-06 |
Family
ID=75263821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020830805.XU Active CN212904622U (en) | 2020-05-18 | 2020-05-18 | Device for measuring heterogeneous content in porous material with limited thickness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212904622U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487282A (en) * | 2020-05-18 | 2020-08-04 | 天津大学 | Device and method for measuring heterogeneous content in porous material with limited thickness |
-
2020
- 2020-05-18 CN CN202020830805.XU patent/CN212904622U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487282A (en) * | 2020-05-18 | 2020-08-04 | 天津大学 | Device and method for measuring heterogeneous content in porous material with limited thickness |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101126729B (en) | Double heat flux gauge steady state method for measuring material heat conductivity | |
| CA1336621C (en) | Measurement of thermal conductivity and specific heat | |
| CN109001252A (en) | Test device of thermal conductivity coefficient | |
| US4956793A (en) | Method and apparatus for measuring the density of fluids | |
| CN108490024B (en) | Method for measuring heterogeneous content of limited-thickness material based on virtual heat source principle | |
| US20140286373A1 (en) | Thermal Resistance Measuring Device | |
| KR20240016453A (en) | Apparatus, systems, and methods for non-invasive thermal interrogation | |
| CN101736570B (en) | Device and method for testing fabric contact coldness | |
| CN107421980B (en) | Heating impedance compensation type thermo-resistance measurement method | |
| CN104280419A (en) | Method for testing material heat conductivity coefficient through transient plane heat source method | |
| US3552185A (en) | Thermal conductivity apparatus | |
| CN110375883A (en) | Clinical thermometer and its temp measuring method based on active thermal flow control | |
| CN113092523B (en) | Device and method for testing heat conduction performance of film material | |
| CN212904622U (en) | Device for measuring heterogeneous content in porous material with limited thickness | |
| Gustavsson et al. | Specific heat measurements with the hot disk thermal constants analyser | |
| CN110174434A (en) | Heterogeneous content and its method of distribution in a kind of measurement porous material | |
| CN109738484A (en) | Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material | |
| CN111487282A (en) | Device and method for measuring heterogeneous content in porous material with limited thickness | |
| CN203502367U (en) | Device for testing heat conductivity coefficient of material by transient plane heat source method | |
| CN106885634A (en) | Unsteady wall heating heat flux distribution measuring method based on infrared thermal imagery thermometry | |
| CN109283217A (en) | A kind of measurement method and device of grapheme material thermal conductivity | |
| CN104132963A (en) | Device for detecting thermal contact resistance under micro-stress condition | |
| CN209342644U (en) | A kind of measuring device of grapheme material thermal conductivity | |
| CN109781309B (en) | High-precision calibration device and method for film type heat flow meter | |
| CN112240894A (en) | Heat-insulation sound-insulation layer water content detection device and method based on sheet-shaped sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |