The synchronous thermogravimetric analyzer (STA) integrates thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC/DTA) in the same testing environment to achieve in-situ synchronous measurement of sample mass changes and thermal effects. This design eliminates systematic errors caused by sample differences, atmosphere fluctuations, and uneven temperature fields in segmented testing, and is the physical basis for obtaining accurate correlation data.

Its core technology lies in the ingenious collaboration of three major parts:

Integrated sensor design: Adopting a top loading or horizontal symmetrical structure, the DSC sensor is accurately integrated while ensuring stable operation of the high-sensitivity balance (resolution up to 0.1 µ g). The key is to minimize the interference of gas convection disturbance and buoyancy effect on the mass signal caused by sample decomposition through symmetrical design and active temperature compensation.

Dynamic atmosphere control technology: equipped with multi-channel mass flow controllers (MFCs) to achieve precise control of static, dynamic, and special atmospheres (such as corrosive gases). By using real-time flow compensation algorithms, it is ensured that even if the sample decomposes violently during the testing process, the composition and flow rate of the furnace atmosphere remain stable, which is the key to obtaining reproducible data.

Multi signal synchronization and decoupling algorithm: Advanced STA adopts a high-frequency synchronous acquisition system (with a sampling rate of up to 100Hz) to ensure the time consistency of TG and DSC signals. By establishing a heat conduction model, the DSC signal is corrected for real-time buoyancy and convection effects, and an algorithm is used to decouple the mutual interference between sample decomposition heat absorption/release and mass changes, thereby separating the true heat flow signal.

The implementation of high-precision measurement also relies on active temperature control technology (such as the Calvi calorimetry used in C80) and multi-layer insulation design to control baseline drift at the µ W level. Modern STA, through modular interfaces, is combined with mass spectrometry (MS) and Fourier transform infrared (FTIR) to achieve real-time qualitative and quantitative analysis of escaping gases, advancing thermal analysis from macroscopic observation to microscopic mechanism research, and becoming a precision tool in material development and failure analysis.