Dynamic characteristics analysis of an infrared thin skin calorimeter for explosive heat flux measurements

Abstract In order to meet the requirements of explosive heat flux measurements, a series of novel improvements for the thin skin calorimeter are proposed in this paper. An infrared thermopile is used in the calorimeter to eliminate the heat dissipation effect caused by the thermocouple firstly. Then a non-overshoot model of high order terms is established by a novel processing method of the temporal derivative. Next, an order-reduction calibration method is used to obtain the coefficients of the non-overshoot model by a narrow-pulse-laser. Finally, an explosive experiment is made to verify the performance of the calorimeter. The calibration results show that dynamic characteristics of the calorimeter are gradually improved with the increase of the model order and the biggest improvement is obtained at the 2nd order. In the experiment, the peak time of the 2nd order model decreases by 54.6% and the peak value increases by 51.3%, compared with the 1st order model.