Gas-phase chemical analysis in an open system using a 2-stage light gas gun

本文建立了两级轻气枪开放系统气相化学分析实验技术，研究了控制冲击汽量的关键参数。利用所提出的方法测量了天然方解石块在大范围的峰值冲击压力下撞击产生的二氧化碳量。得到的CO2量随冲击压力的变化规律与熵值法的理论预测吻合较好。这一结果提供了第一个实验证据，证明了广泛使用的熵法估计撞击产生的水蒸气量的有效性。

We construct an experimental technique of gas-phase chemical analysis in an open system for 2-stage light gas guns to investigate a key parameter, which controls the amount of impact-generated vapor. The amount of impact-generated CO2 from natural calcite blocks was measured under a wide range of peak shock pressure using the proposed method. The obtained CO2 amount as a function of shock pressure is in a good agreement with a theoretical prediction by the entropy method. This result provides the first experimental evidence of the validity of the widely-used entropy method to estimate the amount of impact-generated vapor.