1、 Definition

Transient planar heat source technology (TPS) is a novel method for measuring thermal conductivity, developed by Professor Silas Gustafsson from Chalmer University of Technology in Sweden based on the hot wire method. The principle of determining the thermal properties of materials is based on the transient temperature response generated by a disc-shaped heat source with step heating in an infinite medium. Using thermal resistant materials to create a flat probe that serves as both a heat source and a temperature sensor. The thermal resistance coefficient of an alloy is linearly related to temperature and resistance, which means that by understanding the change in resistance, the heat loss can be determined, thereby reflecting the thermal conductivity of the sample. The probe of this method is a continuous double helix structure thin film formed by etching conductive alloy, with a double-layer insulating protective layer on the outer layer and a very thin thickness, which gives the probe a certain mechanical strength and maintains electrical insulation with the sample. During the testing process, the probe is placed in the middle of the sample for testing. When current passes through the probe, a certain temperature rise is generated, and the heat generated simultaneously diffuses to the samples on both sides of the probe. The speed of thermal diffusion depends on the thermal conductivity characteristics of the material. By recording the temperature and the response time of the probe, the thermal conductivity can be directly obtained from a mathematical model.

Instrument features:

1. Directly measure heat conduction, saving time

2. Wide testing range and high accuracy

3. Just need a flat sample surface, no need for special sample preparation

4. Can be used for the determination of materials such as solids, powders, coatings, films, liquids, etc

5. Reference standard ISO22007-2.2008

software interface

Experimental process

1Preheating process1：Place the probe between two samples to be tested,Use a spring bracket to press the probe tightlyAnd ensure that the probe is placed at the center of the sample,Rotate the power knob counterclockwise to the endThen turn on the power of the hostPower on30Minutes, during which no action is taken;

2Preheating process2Preheating process1After completion, the measurement time is set to160SSelect the probe model based on the power setting, calculate the probe resistance, and then adjust the power to the minimum,Adjust the curve benchmark again (test time is160SWhen, adjust to0.02-0.03between; The testing time is40SWhen, adjust to0.03-0.05between; The testing time is10SWhen, adjust to0.06-0.08between; The testing time is5SWhen, adjust to0.12-0.15Between;),

After the setting is completed, the preheating test begins. The data measured during this process is not used as a reference. After the test is completed, let it stand still10After minutes, normal experimental testing can be conducted;

3According to the requirements of the material to be tested (refer to the material parameter setting table), set the parameters of the measurement conditions according to the function key instructions;

4. Open the testing software on the upper computer and select the communication port of the software; Fill in the software with the parameters set by the function keys on the host, and then start measuring. Wait until the buzzer of the host sounds, at which point the host uploads data;

5. Operate the upper computer software according to the requirements and analyze the thermal conductivity of the tested material.

Actual testing of a customer's product

Fudan University purchases our thermal conductivity tester