A study of temperature-modulated differential scanning calorimetry with high-resolution infrared thermography

Temperature gradients within the sample and furnace in temperature-modulate d differential scanning calorimetry (TMDSC) are studied for a power-compens ation calorimeter of the Perkin Elmer type. The temperature measurements we re made with a high-speed, high-resolution infrared camera. Differences bet ween programmed and actual temperature amplitudes are determined as a funct ion of sample thickness for a sawtooth modulation with up to 48 K min(-1) h eating and cooling rates. Phase angles have been established, and the effec t of open and sealed sample pans has been analyzed. A simple one-dimensiona l description of the observed effects is made and a three-dimensional one i s suggested based on a model available in the literature.