Measurement of Solid Armature’s In-Bore Velocity Using B-Dot Probes in a Series-Augmented Railguns


The waveform of solid armature displacement and velocity can be obtained by arranging B-dot probe arrays along the barrel of a series augmented railgun. The instant of armature arrival will be detected by a visible change within the differential signal from the B-dot probe whereas armature passes by. However, it's tough or maybe impossible in a railgun to directly pick up the arrival moment, because both armature movement and rail current are accountable for the modification of differential signal, particularly within the series-augmented railgun where currents in both outer rails and connecting conductors are most likely sensed by the B-dot probe. A ratio perform (RF) has been introduced to eliminate the influence of current modification, which is the ratio of the integral of differential signal to this. The RF of the armature probe geared toward the armature current will reach a maximum at the moment of armature arrival, while the one at the rail current can reach the median. Three shots with identical initial conditions were conducted during a series-augmented railgun, every of which had adopted the armature probe, rail probe, and Velocity Interferometer System for Any Reflector, respectively. The great agreement between the displacement and velocity waveforms derived from B-dot probes indicated that the tactic and measurement were valid. The accuracy of the B-dot technique is principally laid low with probe dimension and position, railgun current distribution, and electromagnetic noise.

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