Toward Improvements in Pressure Measurements for Near Free-Field Blast Experiments

Abstract

This paper proposes two ways to improve pressure measurement in air-blast experimentations, mostly for close-in detonations defined by a small-scaled distance below 0.4 m.kg−1/3. Firstly, a new kind of custom-made pressure probe sensor is presented. The transducer is a piezoelectric commercial, but the tip material has been modified. The dynamic response of this prototype is established in terms of time and frequency responses, both in a laboratory environment, on a shock tube, and in free-field experiments. The experimental results show that the modified probe can meet the measurement requirements of high-frequency pressure signals. Secondly, this paper presents the initial results of a deconvolution method, using the pencil probe transfer function determination with a shock tube. We demonstrate the method on experimental results and draw conclusions and prospects.

Modeling of Ammunition Dynamic Pressure Measurement Chain in Ballistic Tests

“…Thus, piezoelectric pressure transducers convert pressure into an electrical charge, allowing the measurement and monitoring of that physical quantity. These measuring instruments can be used in different contexts, such as the automotive, petrochemical, aerospace, ballistics and defense industries [4,5].…”