The Study Of Continuous Detonation And Shock Wave Measurement With Pressure-conduction Probe

The detonation velocity measurement is one of the most fundamental problems in explosive researches, mechanics of explosion and rock blasting. There are Dautriche method, probe method, optical method for detonation velocity measurement. With the development of engineering blasting technology, a growing dissatisfaction with these test methods appear, people have been always looking for a new way to measure continuous detonation velocity in blast hole or the near field continuous shock wave velocity in water. Finding an easy and convenient way to measure the detonation continuous velocity is the researchers’pursuit. We have done some studies in the continuous detonation velocity measurement, analyzed some researchers’works, and known the reason of causing a lot of noise wave when measuring:the metal jet generated in the brass shell, the tunnel effect in probe, detonators high-pressure discharge and external electromagnetic waves, etc. Aimed at the noise wave generating reason, we improved the probe test system many times through many explorations and confirmations, and finally determined a proper probe production method:using elastic insulation layer to eliminate metal jet as well as reduce the pipe effect, replacing the resistance wire relying on high-speed impact or high temperature burn-through conduction by pressure-induced conduction, the probe shell grounding and doing strict electromagnetic shielding to the whole test circuit, then making the anti-clutter pressure-conduction probe continuous detonation velocity measurement system to realize the accurate measurement of the detonation velocity.We use the new continuous pressure-conduction probe to experiment in the paper, get more smooth data curves and calculate the accurate detonation wave velocity and pressure. The shock wave initial velocity and pressure in the interface are also obtained; and the decay curves of the underwater shock wave velocity and pressure VS propagation time are simulated. Besides, we have done some explorations of using the continuous pressure conduction probe to measure explosive critical diameter.