The transient heat source method thermal conductivity analyzer is a device used to measure the thermal conductivity of materials. Through innovative probe technology and efficient algorithms, it achieves fast and accurate characterization of material thermal properties. Its advantage lies in balancing efficiency and accuracy, providing a reliable solution for scientific research and industrial applications.

The measurement steps of the transient heat source method thermal conductivity analyzer include sample preparation, instrument calibration, installation of samples and probes, starting testing and data acquisition, stopping the heat source and continuing observation, and data processing and analysis. During use, attention should be paid to safety protection, sample handling, environmental condition control, operating procedures, and data processing to ensure the accuracy and reliability of measurement results.

1. Sample preparation

-Select samples of appropriate size and shape: Select representative samples according to the requirements of the instrument and testing standards. Generally speaking, there are no strict restrictions on the shape of the sample, but it should be ensured that it can make good contact with the probe and is easy to install and fix. For example, it can be a material in various forms such as block, sheet, powder, etc.

-Ensure that the surface of the sample is flat and smooth: Rough surfaces may affect the accuracy of heat transfer and temperature measurement, so it may be necessary to treat the sample surface before testing, such as polishing, to reduce contact thermal resistance.

2. Instrument calibration (if necessary)

-Standard substance calibration: Before use, the instrument can be calibrated with a standard substance with a known thermal conductivity to ensure the accuracy of the measurement results. Place the standard substance in the testing position, follow the normal testing process, compare the difference between the actual measured value and the theoretical value, and adjust the instrument parameters if necessary.

-Environmental factor compensation calibration: Considering the influence of environmental temperature and other factors on measurement, some instruments have environmental compensation function, which can be calibrated through specific programs or settings to make the measurement results closer to the true value.

3. Install samples and probes

-Proper placement of samples: Place the prepared samples in the designated testing area of the instrument, usually on a sample holder, to ensure stable and accurate placement of the samples. For different types of samples, different fixtures or auxiliary devices may need to be used for fixation.

-Connect the probe: Gently attach the probe as a heat source and temperature sensor to the surface of the sample to ensure good thermal contact between the two. If it is a flat heat source probe, try to cover the predetermined testing area as much as possible; If it is a hot wire probe, attention should be paid to the extension state and position of the wire.

4. Start testing and data collection

-Start the heat source: Start the heat source according to the experimental design parameters and apply a transient heat source. This can be a brief pulse heating or a step heating method, depending on the testing method used and the functional settings of the instrument.

-Real time monitoring and data recording: During the application of the heat source, the data acquisition system will synchronously record the temperature changes of the sample. To ensure the stable operation of the data collection system and accurately capture temperature data at various times, these data will be the basis for subsequent analysis and calculation.

5. Stop the heat source and continue observation

-Timely stop heating: Stop applying the heat source according to the predetermined time or judgment criteria. Afterwards, continue to record the temperature changes of the sample until the system temperature stabilizes or reaches the specified observation duration. The data from this stage helps to understand the thermal conductivity characteristics and cooling process of the material.

6. Data processing and analysis

-Using mathematical models to invert parameters: By utilizing the collected data on temperature changes over time, combined with corresponding mathematical models or algorithms, the thermal conductivity, thermal diffusivity, and volumetric heat capacity of the material can be inverted. Different instruments may have specific analysis software built-in to complete this complex calculation process.

-Result evaluation and verification: Evaluate the rationality of the calculated results and check whether they meet the expected range and physical laws. The reliability of the results can be verified through multiple repeated experiments or other independent methods.