Abstract
In blast waves experimental characterization, the electronic method is one of the most simple and reliable for pressure measure. Generally made by piezoelectric material, these compact and small electronic transducers are widely used to detect the shock wave arrival time and, if properly calibrated, the hydrostatic pressure. Moreover, from the achieved arrival time, one can calculate the shock pressure by the Rankine-Hugoniot equation. In this work, two piezoelectric transducers are compared: the first made by a quartz element whereas the second by a ceramic one. The former characterized by high stability, low temperature sensitivity but high costs, while the second, despite a high temperature sensitivity, exhibits a higher natural frequency, smaller sizes, and significant lower cost. The analysis is focused on the arrival time detection, as well as pressure calculation, of a primary shock generated by the explosion of a hemispherical gaseous charge, carried out both in free field and confined geometry. The comparison reveals a relatively good agreement in time detection between the two sensors, with a slight lower dispersion for the ceramic one. Nevertheless, for both the probes, higher values, than that of a calibrated sensor, are achieved in the calculated pressure. This represents a strong limit for the use of ceramic transducer which, if calibrated for direct pressure detection, can provide misleading measures, due to its temperature sensitivity.
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Tadini, P., Gault, K., Sochet, I. (2018). Shock Wave Overpressure Measurement: Comparison Between Two Piezoelectric Sensor Materials. In: Sochet, I. (eds) Blast Effects. Shock Wave and High Pressure Phenomena. Springer, Cham. https://doi.org/10.1007/978-3-319-70831-7_4
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DOI: https://doi.org/10.1007/978-3-319-70831-7_4
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