Fast Heat-Transfer Experiment near the Gas-Liquid Critical point

我们用超灵敏干涉仪在气液临界点附近测量了流体在声时间尺度上的一个非常快速的密度变化，得到了从热到声波的能量传递效率为12%，这与Onuki的理论是一致的。为了提高临界点附近的密度灵敏度，我们研制了红外干涉仪，在临界点附近，样品流体的散射强度很大。为空间实验研制了一种非常紧凑的光温度调节系统。新型电桥对电池温度的检测非常灵敏和稳定。

We have measured a very fast density change of the fluid on acoustic timescale using a ultra-sensitive interferometer near the gas-liquid critical point The efficiency of energy transfer from the heat to the sound wave has been found to be 12%, which agrees with the theory of Onuki.We have developed an infrared interferometer in order to improve the density-sensitivity near the critical point, where the scattering intensity from the sample fluid is very large. A very compact and light temperature- regulation system has been developed for a space experiment New bridge which detects the cell temperature was very sensitive and stable.