瞬态方法在理论上有相似之处，但在主要设计上具有特定的差异。
传感器与电源和感应电路电连接，电流通过传感器，使温度升高并随时间记录变化。产生的热量根据材料热传输特性的速率扩散到样品中。
TPS（双螺旋）传感器放置在两块相同材质与尺寸的样品之间。此方法中，样品假定为半无限体，Thermtest独家 iTransient 功能可协助判定测试所需时间与功率 (MP-V可选的测试时间范围为2 至 160 秒)。此外， 多样的传感器尺寸可供选择，以灵活应变不同的样品尺寸。其他可选的测试模组包括各向异性、薄膜和比热。
*仅限改良式瞬态平面热源法 (MTPS)
Methods | TPS | THW | MTPS | TLS |
|---|---|---|---|---|
Materials | Solids, pastes and powders | Liquids and PCMs | Solids, pastes and powders | Soil, pastes, and polymers |
Testing modules | 3-D: Bulk, Anisotropic, Slab, Thin-Film. General: Specific Heat | Bulk | 3-D: Bulk, Anisotropic, Slab. 1-D: Standard, 1-D Slab | Bulk |
Thermal conductivity (W/m·K) | 0.01 to 500 | 0.01 to 2 | 0.03 to 500 | 0.1 to 8 |
Thermal diffusivity (mm²/s) | 0.01 to 300 | Up to 0.5 | 0.01 to 300 | N/A |
Specific heat (J/kg-K) | Up to 5 | Up to 5 | Up to 5 | N/A |
Thermal effusivity (W√s/m²K) | 20 to 40000 | N/A | 20 to 40000 | N/A |
Sample size (mm | mL)* | 10 diameter or square | 20 mL | 25 diameter or square | 50 diameter |
Sample thickness (mm)* | 0.05 | N/A | 0.1 | 100 length |
Largest sample size (mm) | Unlimited | Unlimited | Unlimited | Unlimited |
Test time (seconds) | 2 to 160 | 1 | 2 to 160 | 180 |
Accuracy (Thermal conductivity) | 5% | 2% | 5% | 5% |
Repeatability (Thermal conductivity) | 2% | 1% | 2% | 2% |
Temperature range (°C)** | 0 to 300 -75 to 300 | -50 to 200 | 0 to 100 | -50 to 200 | -40 to 100 |
Sample configuration | Symmetric (Two-Sided) | Asymmetric (Single-Sided) | Inserted | Asymmetric (Single-Sided) | Inserted |
Standard | ISO 22007-2:2022, ISO 22007-7:2023, GB/T 32064-2015 | ASTM D7896-19 | ISO 22007-7:2023 | ASTM D5334-22a, ASTM D5930-17, IEEE 442-2017 |
* Based on testing module used.
** For temperature, external control required.
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