Measurement, calibration, and verification on the critical ignition temperature of hot bridge wire electro-explosive device

Abstract

To address the problem of the difference in temperature between the exposed and amorce-filled state of the bridge wire in the fiber optic thermometry, this paper proceeds from a mathematical model of the temperature rise of the hot bridge wire electro-explosive device (EED), the relationship between the critical ignition temperature and the current of hot bridge wire EED is discussed. Combining thermal ignition theory, the technique of measurement and calibration the critical ignition temperature of hot bridge wire EED is proposed, and the technique is validated by injection versus radiation. The results show that the critical ignition temperature of the tested hot bridge wire EED obtained by testing and calibration is 337.53°C. The 50% ignition field strength of the hot bridge wire EED under radiation conditions obtained by the up-and-down method test is 1271 V/m, while the equivalent ignition field strength determined from the critical ignition temperature under the same radiation conditions is 1345 V/m, the error between the two is only 0.49 dB, which demonstrates the high accuracy of the proposed measurement and calibration technique.