Design of A New Differential Scanning Calorimeter

Abstract

The core component of DSC is a temperature difference sensor used to measure the temperature change of sample and reference material during reaction. Taking temperature difference sensor as the research object, a new DSC is designed, which uses many pairs of thermocouples in series to form a radiating thermocouple stack to improve the calorimetric sensitivity of the temperature difference sensor and reduce the measurement error caused by the uneven temperature distribution on the sensor. Through theoretical analysis, it can be seen that the original signal acquisition volume of the temperature difference sensor with multiple pairs of thermocouples has increased greatly, the calorimetric sensitivity is higher, and the error is smaller. Based on the finite element analysis software ANSYS, the steady state thermal analysis is performed on the high-sensitivity temperature difference sensor and the dumbbell-type temperature difference sensor respectively. The results show that the temperature difference of the high-sensitivity temperature difference sensor is 40.8% ∼ 52.3% lower than that of the dumbbell-type temperature difference sensor under different working temperatures, which greatly reduces the measurement error caused by the uneven temperature distribution.