Coupling techniques are used in chemical analytics to combine the features of different analytic methods.

The TGA-FTIR coupling uses the thermogravimetric analysis to measure the mass (usually mass loss) of a sample over time during a given temperature program.

The gases resulting from the thermal decomposition of the sample are analyzed simultaneously by means of infrared spectroscopy.

The chemical information on the decomposition gases can give deeper insights in the decomposition mechanisms or simply reveal the chemical nature of the emitted gases.