阅读说明：本技术 多层复合材料测量方法及装置 (Method and device for measuring multilayer composite material ) 是由 祝渊 曾少博 陈安琪 段淇耀 郭维 高欣甜 于 2020-10-14 设计创作，主要内容包括：本发明公开了一种多层复合材料测量方法及装置。本发明实施例包括：获取多层复合材料在第一方向上的温度-时间变化关系T(t)；根据温度-时间变化关系T(t)得到热阻-时间变化关系Z(t)；对热阻-时间变化关系Z(t)进行处理,以得到每一个子层的第一热阻；根据第一热阻得到每一个子层的热导率。根据本发明实施例提供的方案,通过温度-时间变化关系T(t)求取热阻-时间变化关系Z(t),以获取热阻信息,并根据热阻-时间变化关系Z(t)得到每一个子层的第一热阻,实现对每一个子层热阻信息的瞬态测量,从而可以推导出每一个子层的热导率,以减小热物性测量的误差。(The invention discloses a method and a device for measuring a multilayer composite material. The embodiment of the invention comprises the following steps: acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction; obtaining a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t); processing the thermal resistance-time change relation Z (t) to obtain a first thermal resistance of each sub-layer; the thermal conductivity of each sub-layer is obtained according to the first thermal resistance. According to the scheme provided by the embodiment of the invention, the thermal resistance-time change relation Z (t) is obtained through the temperature-time change relation T (t) to obtain thermal resistance information, the first thermal resistance of each sub-layer is obtained according to the thermal resistance-time change relation Z (t), and the transient measurement of the thermal resistance information of each sub-layer is realized, so that the thermal conductivity of each sub-layer can be deduced, and the error of thermophysical property measurement is reduced.)

1. A multilayer composite material measurement method, wherein a plurality of sublayers arranged in a lamination way are arranged in the multilayer composite material, is characterized by comprising the following steps:

acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction;

obtaining a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t);

processing the thermal resistance-time variation relation Z (t) to obtain a first thermal resistance of each sub-layer;

and obtaining the thermal conductivity of each sub-layer according to the first thermal resistance.

2. The method for measuring a multilayer composite according to claim 1, wherein the obtaining of the thermal resistance-time variation relation z (t) from the temperature-time variation relation t (t) specifically comprises:

the relationship between thermal resistance and time

Wherein, T₀The initial temperature of the multilayer composite material is shown, T (t) shows the temperature-time change relation, and delta P shows the thermal power change rate.

3. The multilayer composite measurement method according to claim 2, wherein the processing of the thermal resistance-time variation relationship z (t) to obtain the first thermal resistance of each of the sub-layers comprises:

obtaining a first temperature response function of the multilayer composite material according to the thermal resistance-time change relation Z (t);

obtaining the total thermal resistance of the multilayer composite material according to the first temperature response function;

and obtaining the first thermal resistance and the first heat capacity according to the total thermal resistance.

4. The multilayer composite measurement method of claim 3, wherein said obtaining a total thermal resistance of the multilayer composite from the first temperature response function specifically comprises:

carrying out continuous processing on the first temperature response function to obtain a second temperature response function;

and carrying out differential processing on the second temperature response function to obtain the total thermal resistance.

5. The multilayer composite measurement method of claim 4, wherein said obtaining the first thermal resistance and the first heat capacity from the total thermal resistance comprises:

obtaining the first thermal resistance R according to the total thermal resistance_th＝R(Z)/ΔZ；

Obtaining the first heat capacity C according to the first thermal resistance_th＝e^z/R_th；

Wherein R is_thRepresenting said first thermal resistance, R (Z) representing said total thermal resistance, Δ Z representing delamination, C_thRepresents said first heat capacity, e^zRepresenting a time constant.

6. The multilayer composite measurement method according to any one of claims 1 to 5, wherein the first direction is a vertical direction.

7. The multilayer composite measurement method of claim 6, further comprising:

treating the multi-layer composite to bond an adsorbent layer to a first surface of the multi-layer composite.

8. Multilayer combined material measuring device, multilayer combined material is equipped with a plurality of sublayers that the stromatolite set up, its characterized in that includes:

the heating device is used for sending a heating signal to heat the multilayer composite material;

the temperature measuring device is used for acquiring temperature data of the multilayer composite material in a first direction;

and the data processing device is connected with the temperature measuring device and used for acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction according to the temperature data, acquiring a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t), and processing the thermal resistance-time change relation Z (t) to acquire a first thermal resistance of each sublayer.

9. The multi-layer composite measurement device of claim 8, further comprising:

a cooling device connected with the second surface of the multilayer composite material and used for keeping the temperature of the second surface constant;

and the signal control device is arranged between the heating device and the multilayer composite material and is used for controlling the transmission direction of the heating signal.

10. The multi-layer composite measurement device of claim 9, further comprising:

and the power supply device is electrically connected with the heating device, the temperature measuring device, the data processing device and the cooling device respectively and is used for providing a power supply.

Technical Field

The invention relates to the field of thermophysical property measurement, in particular to a method and a device for measuring a multilayer composite material.

Background

At present, the heating rate of electronic devices is increasing continuously, and in order to ensure the safe and stable operation of the electronic devices, heat is dissipated by a heat conduction material with good heat conduction effect.

In the related art, since it is difficult for a single layer of material to meet the heat dissipation requirement of an electronic device, a multi-layer composite material is generally used to improve the heat dissipation effect of the electronic device. However, in the heat conduction process, since the thermal conductivity of each layer of the multilayer composite material is different, a thermal crosstalk phenomenon is easily generated, so that an error is caused in the measurement of the thermophysical properties of the multilayer composite material.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method and a device for measuring a multilayer composite material, which can realize the measurement of the thermal conductivity of each layer of the multilayer composite material so as to improve the accuracy of the measurement of the thermophysical property of the multilayer composite material.

In a first aspect, an embodiment of the present invention provides a method for measuring a multilayer composite material having a plurality of sublayers stacked, the method including: acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction; obtaining a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t); processing the thermal resistance-time variation relation Z (t) to obtain a first thermal resistance of each sub-layer; and obtaining the thermal conductivity of each sub-layer according to the first thermal resistance.

The multilayer composite material measuring method provided by the embodiment of the invention at least has the following beneficial effects: in the embodiment of the application, the thermal resistance-time change relation Z (t) is obtained through the temperature-time change relation T (t) to obtain thermal resistance information, the first thermal resistance of each sub-layer is obtained according to the thermal resistance-time change relation Z (t), transient measurement of the thermal resistance information of each sub-layer of the multilayer composite material is realized, and therefore the thermal conductivity of each sub-layer can be deduced, and the error of the measurement of the thermophysical properties of the multilayer composite material is reduced.

Multilayer composite measurement method according to further embodiments of the present invention, according to the temperature-timeObtaining a thermal resistance-time change relation Z (t) through the change relation T (t), and specifically comprising the following steps: the relationship between thermal resistance and timeWherein, T₀The initial temperature of the multilayer composite material is shown, T (t) shows the temperature-time change relation, and delta P shows the thermal power change rate.

According to another embodiment of the present invention, the processing the thermal resistance-time variation relationship z (t) to obtain the first thermal resistance of each sub-layer specifically includes: obtaining a first temperature response function of the multilayer composite material according to the thermal resistance-time change relation Z (t); obtaining the total thermal resistance of the multilayer composite material according to the first temperature response function; and obtaining the first thermal resistance and the first heat capacity according to the total thermal resistance.

According to another embodiment of the present invention, the method for measuring a multilayer composite material, wherein the obtaining of the total thermal resistance of the multilayer composite material according to the first temperature response function specifically includes: carrying out continuous processing on the first temperature response function to obtain a second temperature response function; and carrying out differential processing on the second temperature response function to obtain the total thermal resistance.

According to another embodiment of the present invention, the method for measuring a multilayer composite material, where the first thermal resistance and the first heat capacity are obtained according to the total thermal resistance, specifically includes: obtaining the first thermal resistance R according to the total thermal resistance_thR (Z)/Δ Z; obtaining the first heat capacity C according to the first thermal resistance_th＝e^z/R_th(ii) a Wherein R is_thRepresenting said first thermal resistance, R (Z) representing said total thermal resistance, Δ Z representing delamination, C_thRepresents said first heat capacity, e^zRepresenting a time constant.

According to still further embodiments of the multilayer composite measurement method of the present invention, the first direction is a vertical direction.

Multilayer composite measurement methods according to further embodiments of the invention further include: treating the multi-layer composite to bond an adsorbent layer to a first surface of the multi-layer composite.

In a second aspect, one embodiment of the invention provides a multi-layer composite material measurement apparatus, the multi-layer composite material being provided with a plurality of sub-layers arranged in a stack, comprising a heating device for sending a heating signal to heat the multi-layer composite material; the temperature measuring device is used for acquiring temperature data of the multilayer composite material in a first direction; and the data processing device is connected with the temperature measuring device and used for acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction according to the temperature data, acquiring a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t), and processing the thermal resistance-time change relation Z (t) to acquire a first thermal resistance of each sublayer.

Multilayer composite measurement apparatus according to further embodiments of the present invention, further comprising: a cooling device connected with the second surface of the multilayer composite material and used for keeping the temperature of the second surface constant; and the signal control device is arranged between the heating device and the multilayer composite material and is used for controlling the transmission direction of the heating signal so as to uniformly heat the multilayer composite material.

Multilayer composite measurement apparatus according to further embodiments of the present invention, further comprising: and the power supply device is electrically connected with the heating device, the temperature measuring device, the data processing device and the cooling device respectively and is used for providing a power supply.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

FIG. 1 is a schematic flow chart diagram illustrating an exemplary method for measuring a multilayer composite material in accordance with an embodiment of the present invention;

FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a method for measuring a multilayer composite according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a method for measuring a multilayer composite according to an embodiment of the present invention;

FIG. 4 is a schematic flow chart diagram illustrating another embodiment of a method for measuring a multilayer composite according to an embodiment of the present invention;

FIG. 5 is a schematic flow chart diagram illustrating another embodiment of a method for measuring a multilayer composite according to an embodiment of the present invention;

FIG. 6 is a block diagram of an embodiment of a multi-layer composite material measurement apparatus in accordance with embodiments of the present invention;

FIG. 7 is a schematic structural diagram of an embodiment of a multi-layer composite material measurement apparatus according to an embodiment of the present invention.

Description of reference numerals:

heating device 100, temperature measuring device 200, data processing device 300, cooling device 400, power supply device 500, signal control device 600, multilayer composite 700.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it can be directly disposed, fixed, or connected to the other feature or indirectly disposed, fixed, connected, or mounted to the other feature.

In the description of the embodiments of the present application, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

First, several nouns in the embodiments of the present application are explained:

thermal physical properties: the general term refers to parameters which reflect various thermodynamic characteristics and are expressed in the thermal process of materials, and systematically reflects the heat carrying capacity and the heat transport capacity of the materials.

The thermophysical properties include: specific heat, thermal conductivity, thermal diffusivity and other parameters.

In a first aspect, embodiments of the present application provide a method for measuring a multilayer composite material, in which a plurality of sub-layers are disposed in a stacked manner.

Referring to fig. 1, in some embodiments, a multilayer composite measurement method includes the steps of: s100, acquiring a temperature-time change relation T (t) of the multilayer composite material in a first direction; s200, obtaining a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t); s300, processing the thermal resistance-time change relation Z (t) to obtain a first thermal resistance of each sublayer; and S400, obtaining the thermal conductivity of each sub-layer according to the first thermal resistance.

In step S100, a specific implementation of the step S100 of obtaining the temperature-time variation relationship t (t) of the multilayer composite material in the first direction is as follows: the method comprises the steps of stacking a plurality of sublayers in the multilayer composite material, placing the multilayer composite material in a constant-temperature testing device, and heating the multilayer composite material by using heating devices with different power conditions to obtain a temperature-time change relation T (T) of the multilayer composite material in a first direction, for example, obtaining temperature data T of the multilayer composite material in a vertical direction to obtain a temperature-time change relation T (T) of the multilayer composite material in the vertical direction, so that one-dimensional conduction of heat conduction is realized, and temperature measurement errors are reduced.

Step S200, a specific implementation of obtaining the thermal resistance-time variation relation z (t) according to the temperature-time variation relation is as follows: and establishing a thermal resistance-time change relation Z (t) according to the temperature-time change relation T (t) to obtain thermal resistance information.

In the embodiment of the application, the thermal resistance-time change relation Z (t) is obtained through the temperature-time change relation T (t) to obtain thermal resistance information, the first thermal resistance of each sub-layer is obtained according to the thermal resistance-time change relation Z (t), transient measurement of the thermal resistance information of each sub-layer is realized, and therefore the thermal conductivity of each sub-layer can be deduced, and errors in measurement of the thermophysical properties of the multilayer composite material are reduced.

In some embodiments, the step S200 of obtaining the thermal resistance-time variation relation z (t) according to the temperature-time variation relation t (t) includes: converting the temperature-time change relation T (t) into a thermal resistance-time relation Z (t), wherein the specific expression of the thermal resistance-time relation Z (t) is as follows:

in formula (1), T₀Denotes the initial temperature of the multilayer composite, i.e. the initial temperature of the multilayer composite before heating; t (t) represents a temperature-time relationship, and Δ P represents a thermal power change rate of the heating device.

Referring to fig. 2, in some embodiments, step S300 includes: s310, obtaining a first temperature response function of the multilayer composite material according to a thermal resistance-time change relation Z (t); s320, obtaining the total thermal resistance of the multilayer composite material according to the first temperature response function; s330, obtaining a first thermal resistance and a first heat capacity according to the total thermal resistance.

In step S310, according to the relationship z (t) between thermal resistance and time variation, a specific embodiment of the first temperature response function of the multilayer composite material is as follows: the thermal resistance-time variation relationship z (t) is considered to be a first order response system and represents a first temperature response function of the multilayer composite as the sum of exponential functions:

wherein, tau_i＝R_thi·C_thiThe.

In the formula (2), T (t) represents a temperature-time change relationship, Δ P_hRepresents heating power in units of W; n represents n layers in total of the multilayer composite material; r_thiRepresents the thermal resistance of the ith layer, and the unit is K/W; t represents time in units of s; c_thiRepresents the heat capacity of the ith layer and has the unit of J/K. In formula (3), τ_iDenotes the time constant in units of s.

In some embodiments, Δ P is assumed_hThe first temperature response function can be expressed as a unit step response, and a specific expression of the unit step response can be referred to as formula (3):

step S320, a specific implementation of obtaining the total thermal resistance of the multilayer composite material according to the first temperature response function is as follows: and processing the first temperature response function or the unit step response after the first temperature response function is transformed to obtain the total thermal resistance of the multilayer composite material.

Step S330, a specific implementation of obtaining the first thermal resistance and the first heat capacity according to the total thermal resistance is as follows: according to the total thermal resistance of the multilayer composite material and the layering information of the multilayer composite material, the first thermal resistance of each sub-layer can be obtained, and the first heat capacity of each sub-layer can be further obtained according to the first thermal resistance, so that the measurement of the thermal resistance and the heat capacity of each layer of material of the multilayer composite material is realized.

Referring to fig. 3, step S320 includes: s321, carrying out continuous processing on the first temperature response function to obtain a second temperature response function; and S322, carrying out differential processing on the second temperature response function to obtain the total thermal resistance.

In step S321, the first temperature response function is processed continuously toOne specific implementation of obtaining the second temperature response function is as follows: discrete thermal time constant tau_iSubstitution with a continuous spectrum of thermal time constants gives formula (4):

step S322, performing differential processing on the second temperature response function to obtain the total thermal resistance, in which a specific embodiment of the method is as follows: and (3) performing differential processing on T (t) in the formula (4), and determining each layer of material according to the inflection point of a differential curve:

in formula (5), r (z) represents the total thermal resistance, w (z) represents the time function, and each Δ z corresponds to a parallel RC circuit.

Referring to fig. 4, in some embodiments, step S330 includes the steps of: s331, obtaining a first thermal resistance R according to the total thermal resistance_thR (Z)/Δz; s332, obtaining a first heat capacity C according to the first thermal resistance_th＝e^z/R_th。

In some embodiments, the thermal resistance R of each layer of the multilayer composite is determined from the total thermal resistance_thR (Z)/. DELTA.z, wherein R_thRepresents a first thermal resistance with the unit of K/W; r (Z) represents total thermal resistance, and Δ Z represents delamination. According to a first thermal resistance R_thThe first heat capacity C can be obtained_th＝e^z/R_thWherein, C_thDenotes the first heat capacity in units of J/K, e^zDenotes the time constant in units of s.

Step S400, a specific implementation of obtaining the thermal conductivity of each sub-layer according to the first thermal resistance is as follows: by the relationship of thermal resistance and thermal conductivity: and R is L/(lambda A), and the thermal conductivity of each layer can be correspondingly obtained according to the first thermal resistance, so that the thermophysical property measurement of each sublayer is realized. Wherein R represents a first thermal resistance with a unit of K/W; l represents the thickness of the multilayer composite material and has the unit of m; λ denotes the thermal conductivity, singlyThe bit is W/(m.K); a represents the cross-sectional area of the multilayer composite material in m²。

In some embodiments, the total thermal resistance may also be expressed as:

in formula (6), λ represents thermal conductivity, a (ξ) represents the cross-sectional area of the x layer in the multilayer composite, and R represents_ΣRepresenting the total thermal resistance of the x layers in the multilayer composite. The total heat capacity can be expressed as:

in formula (7), C_νDenotes the specific heat capacity, A (ξ) denotes the cross-sectional area of the x layer in the layer composite, C_ΣRepresenting the total thermal capacity of the x layers in the multilayer composite. The relation between the multilayer composite material and the thermal resistance and the thermal capacity can be more intuitive and convenient through the formulas (6) and (7), so that a user can select the multilayer composite material according to actual requirements. It is understood that, in the above embodiments, the multilayer composite material is taken as an example for illustration, but the number of the sub-layers provided in the multilayer composite material is not particularly limited, that is, the embodiments of the present application can also realize the measurement of the thermophysical property of the single-layer material by the method described in the above embodiments.

Referring to fig. 5, in some embodiments, the multilayer composite measurement method further comprises the steps of: and S500, processing the multilayer composite material to enable the first surface of the multilayer composite material to be bonded with an adsorption layer. In particular, since the emissivity and absorptivity of the surface are different for different multilayer composites, different absorptivity results in different actual heating power for the same heating power. And the different emissivities will cause errors in the temperature measurement of the multilayer composite material, thereby affecting the measurement of the thermal resistance of the multilayer composite material. Therefore, in order to ensure the accuracy of the temperature measurement of the multilayer composite material, when the thermal resistance of the multilayer composite material is measured, the first surface of the multilayer composite material is treated, for example, a layer of carbon black is uniformly sprayed on a copper foil with the thickness of 60 μm, and then the treated copper foil is bonded to the first surface of the multilayer composite material in a physical bonding mode, so that the thermal resistance measurement error caused by the temperature measurement deviation is reduced. It can be understood that the first surface is the surface of the multi-layer composite material directly irradiated by the heating device, and the material and thickness of the adsorption layer and the substance sprayed on the surface of the adsorption layer can be adaptively adjusted according to actual needs.

In a specific embodiment, the thermal resistance-time variation relation Z (t) of the multi-layer composite material is obtained by acquiring the temperature-time variation relation T (t) of the multi-layer composite material in the vertical direction. Carrying out conversion, continuous treatment and differential treatment on the thermal resistance-time change relation Z (t) to obtain the total thermal resistance of the multilayer composite material, and further solving the first thermal resistance R of each layer material in the vertical direction of the multilayer composite material_thAnd a first heat capacity C_th. And obtaining the thermal conductivity of each layer of material according to the relation R of the thermal resistance and the thermal conductivity L/(lambda A) so as to realize the measurement of the thermophysical property of each layer of material.

In a second aspect, embodiments of the present application provide a multilayer composite measurement device, where the multilayer composite is provided with a plurality of sub-layers arranged in a stack.

Referring to fig. 6, in some embodiments, a multilayer composite measurement device includes: the device comprises a heating device 100, a temperature measuring device 200 and a data processing device 300, wherein the heating device 100 is used for sending a heating signal to heat the multilayer composite material 700; the temperature measuring device 200 is used for acquiring temperature data of the multilayer composite material 700 in a first direction; the data processing device 300 is connected to the temperature measuring device 200, and is configured to obtain a temperature-time change relationship t (t) of the multilayer composite material in the first direction according to the temperature data, obtain a thermal resistance-time change relationship z (t) according to the temperature-time change relationship t (t), and process the thermal resistance-time change relationship z (t) to obtain a first thermal resistance of each sub-layer. Specifically, the heating device 100 sends an infrared signal to heat the multilayer composite material 700, and the temperature measuring device collects temperature data of the multilayer composite material and sends the temperature data to the data processing device, so that the data processing device obtains a temperature-time change relation t (t) according to the temperature data.

Referring to fig. 7, in some embodiments, the heating device 100 is disposed opposite to the multi-layer composite material 700, and the heating device 100 is not in contact with the multi-layer composite material 700, so as to avoid the disturbance of heat conduction caused by the contact. The heating device 100 sends a heating signal to heat the multilayer composite material 700, the temperature measuring device 200 is arranged above the first surface of the multilayer composite material 700, and the temperature measuring device 200 is arranged without contacting with the multilayer composite material 700, so that the temperature data can be rapidly sampled, enough frames of temperature data can be acquired, and the sampling precision of the temperature data can be improved. The temperature measurement device 200 includes a sensor, such as a temperature sensor, that can perform temperature data acquisition on the multilayer composite 700. The temperature measurement device 200 sends the acquired temperature data of the multilayer composite material 700 in the vertical direction to the data processing device 300, so that the data processing device 300 generates a temperature-time change relation t (t), and the data processing device 300 obtains a thermal resistance-time change relation z (t) according to the temperature-time change relation t (t), thereby solving the total thermal resistance of the multilayer composite material 700 to obtain the first thermal resistance and the first thermal capacity of each layer of the multilayer composite material 700. It is understood that the heating signal stability can be improved by fixing the angle of the heating device 100 to the multi-layer composite 700.

In some embodiments, the multilayer composite measurement device further comprises: a cooling device 400 and a signal control device 600. A cooling device 400 is coupled to the second surface of the multi-layered composite 700 for maintaining the temperature of the second surface constant; the signal control device 600 is disposed between the heating device 100 and the multi-layer composite material, and is used for controlling the transmission direction of the heating signal, so that the multi-layer composite material 700 is uniformly heated. Specifically, the first surface of the multilayer composite 700 is the upper surface of the multilayer composite 700 and the second surface of the multilayer composite 700 is the opposite surface of the first surface, i.e., the bottom surface of the multilayer composite 700. The cooling device 400 is coupled to the bottom surface of the multi-layered composite material 700 to maintain the temperature of the bottom surface of the multi-layered composite material 700 constant, thereby reducing the influence of the external ambient temperature. The signal control means 600 is disposed on a transmission path of the heating signal to control a transmission direction of the heating signal and a heating shape and size. For example, the signal control device 600 includes an optical stop disposed between the heating device 100 and the multilayer composite material 700, and the optical stop is in a transmission path of the infrared signal to achieve uniform heating of the multilayer composite material 700. The shape and size of the infrared signal can be controlled by setting diaphragms with different specifications and/or adjusting the aperture of the diaphragm, so that the heating effect of the multilayer composite material 700 can be controlled. In some embodiments, the heating device 100, the multi-layer composite material 700, the cooling device 400, the signal control device 600 and the temperature measuring device 200 are disposed in the same sealed device to reduce the influence of the external environment and the measurement error caused by thermal convection, thereby ensuring the accuracy of the temperature measurement of the temperature measuring device 200.

Referring to fig. 6, in some examples, the multilayer composite measurement device further includes: a power supply device 500. The power supply device 500 is connected to the heating device 100, the temperature measuring device 200, the data processing device 300, and the cooling device 400, respectively, and is used for supplying power.

In a particular embodiment, a first surface of the multi-layer composite 700 is treated and a second surface of the multi-layer composite 700 is placed on the cooling device 400. The heating system sends infrared signals to heat the multilayer composite material 700, and the temperature measuring device 200 collects temperature data of the multilayer composite material 700 and sends the temperature data to the data processing device 300. The data processing device 300 processes the temperature data to obtain a temperature-time variation relationship t (t), so as to calculate a first thermal resistance and/or a first thermal capacity of each layer of the multilayer composite material 700, thereby implementing measurement of the thermal conductivity of each layer of the multilayer composite material 700.

The embodiment of the application carries out non-contact setting through with multilayer combined material and heating device to gather multilayer combined material temperature data in the vertical direction, in order to reduce multilayer combined material temperature measurement error, through the measurement to the first thermal resistance and/or the first heat capacity of each sublayer, improved multilayer combined material thermophysical property measuring accuracy.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.