It is essential in weapons systems to understand how much explosive power is applied according to various chemicals and methods of the explosion. In particular, to measure dynamic thermal phenomena and analyze thermal properties under high-temperature and high-pressure conditions. Although many researchers have used thermocouples to measure the temperature during an explosion, this method has an error in the temperature measurement as the radiant heat flux increases. Another measurement method is needed to solve this problem. During an explosion in a shock tube, the temperature change was measured with a thermocouple and a pressure sensor. To solve the limitations of the thermocouple’s measurement responsiveness in temperature measurement was compared with the TDLD (tunable diode laser detection) method. In the case of the TDLD method, the time to reach the peak was measured an average 0.0207 sec faster than the thermocouple. Moreover, the peak average temperature was 15.8 °C higher than that of the thermocouple.