We have investigated the difference between adiabatic and isothermal compression of liquids by an impacting weight, as observed in the resulting change to the index of refraction. The liquids examined were sebacate, glycerol, and water. For practical reasons, sebacate is best suited for the use of a drop-weight apparatus as a metrologically traceable calibration facility for dynamic pressure. We find that its optical properties under adiabatic and isothermal compression can be converted into each other using literature values of its thermodynamic properties. Care has to be taken to avoid cavitation-like effects, an observation that might need to be taken into account for other methods of generating short pressure pulses in the hundreds-of-MPa range.

中文翻译：

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比较落锤装置中折射率的绝热和等温压力依赖性

我们已经研究了撞击重量对液体的绝热压缩和等温压缩之间的差异，正如在由此产生的折射率变化中所观察到的那样。检查的液体是癸二酸酯、甘油和水。出于实际原因，sebacate 最适合使用落锤装置作为动态压力的计量可追溯校准设施。我们发现它在绝热和等温压缩下的光学性质可以使用其热力学性质的文献值相互转换。必须小心避免空化效应，这一观察结果可能需要考虑到其他产生数百 MPa 范围内的短压力脉冲的方法。