Most studies assessing the safety of hot bridge wire EEDs employ temperature sensors that directly use the measurements of the temperature measurement device without analyzing the accuracy of the temperature measurement. This study establishes the response function of the exposed bridge and exposed bridge temperature rise system of hot bridge wire EEDs through the Rosenthal’s temperature rise equation and Laplace transformation as well as experimental tests, and through the response function, the response law and numerical characteristics of the two are compared and analyzed under four typical excitations. Under steady current injection and continuous-wave radiation, both exposed bridge and exposed bridge temperature measurement systems can reach thermal equilibrium, and the equilibrium temperature of both are the same. However, under pulse excitation, the temperature rise measurement value is significantly different from the actual value due to the large difference in response time of the exposed bridge (1 ms) and the exposed bridge temperature measurement device (0.82 s). Studies have shown that under steady current injection and continuous-wave radiation, temperature rise measurements can be directly applied to the safety assessment of hot bridge wire EEDs, while under pulsed conditions, temperature rise measurements cannot be directly applied.

When typical radar equipment is subjected to single-frequency electromagnetic radiation, the radar display interface forms a pseudo-signal, resulting in the misjudgment of real targets. Based on the working principle of stepped-frequency radar ranging, the effect mechanism of radar equipment pseudo-signal interference is revealed. Taking a Ku band stepped-frequency ranging radar as the test object, the pseudo-signal interference effect test of single-frequency electromagnetic radiation is carried out in this study. The pseudo-signal level value of 6 dBmV is selected as the sensitive criterion of the pseudo-signal interference effect. Through experiments, the variation curves of the pseudo-signal level values of the sensitive frequency bands and the typical frequency points inside and outside the band with the field strength of the single-frequency interference are obtained. Based on the nonlinear distortion analysis of the receiving circuit, the variation laws of the pseudo-signal level values inside and outside the band are explained, respectively. The experimental results show that there are at least seven pseudo-signal interference-sensitive bands in the tested radar, and the first pseudo-signal strength is only related to the interference signal strength. The essence of the second type of pseudo-signal interference is intermodulation interference, and the pseudo-signal level is related to the interference signal and the useful signal strength.

In order to establish the prediction model of radar equipment in multisource complex electromagnetic environment, the blocking effect and false alarm interference effect caused by single-frequency CW (continuous wave) electromagnetic interference on typical radar equipment are studied. Taking a certain sweep radar as the research object, the equivalent injection test of EMI (electromagnetic interference) is carried out. Based on the theory of radar front door coupling, the interference mechanism of EMI to radar receiver RF front end is revealed, and the variation law of blocking target and false alarm target level is analyzed. The results show that, under the single-frequency CW-EMI, the target echo level decreases with the increase of the interference field strength, and the false alarm level increases with the increase of the interference field strength. The blocking jamming sensitive bandwidth is about f 0 ± 200   MHz , and the false alarm jamming sensitive bandwidth is about f 0 ± 80   MHz .

The particle diameter and luminous intensity of aluminum powder were measured by laser analyzer and photo-effect tester. The luminous intensity of [Ba(NO3)2＋Al] illuminant were studied for different shape and diameter of aluminum powder as well as ultra-fine powder prepared by chemical method. The results show that the luminous intensity increases with particle size reduced, and luminous intensity of non-spherical aluminum is more than that of spherical aluminum. The change rate of luminous intensity increases rapidly when particle diameter was less than 2μm. It’s change rate in [0.6，2.13] is 4.37 times that in [2.13，4.24] interval.The ultra-fine aluminum powder and the submicron aluminum powder can effectively enhance the luminous performance of pyrotechnics.

Hot bridge wire electro explosive device (EED) is widely used as a starting element in aerospace and other fields, its thermal ignition process and safety testing technology have always been the focus of research. In this paper, we constructe the temperature rise model of the hot bridge wire EED by using the law of conservation of energy, then the temperature response of the bridge wire and the reagent is obtained. According to the theoretical and numerical analysis, the sensitive criterion of the hot bridge wire EED is given, and the simulation process of the critical ignition current is designed, based on this process, the law of the influence of bridge wire and reagent parameters on the ignition of hot bridge wire EED was studied. The research results show that the first derivative of the reagent temperature with respect to the radial distance is greater than zero as a sensitive criterion for the ignition of the hot bridge wire EED with high accuracy, and compared with traditional numerical methods, the proposed process makes the acquisition of the critical ignition current more precise and programmed due to the use of sensitive criteria. In addition it is more significant that the critical ignition current increases first squarely as the square root of the bridge wire radius, and then linearly; the square of the critical ignition current increases linearly with the activation energy of the reagent; the rapid exponential decay of the critical ignition current with increasing reagent combustion heat, and the existence of asymptotic values. In engineering use, it is possible to conveniently design the ignition characteristics of the hot bridge wire EED by changing the radius of the bridge wire. This study serves as the foundational work for the safety testing of hot bridge wire EED and can provide theoretical guidance for the safety testing, actual production and use of hot bridge wire EED.