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中文摘要：
一“双气体声学的放大器”被介绍在这篇论文联合一台 thermoacousticheat 引擎和一个二阶段的脉搏试管冷却器。与以前的声学的放大器相比，这个新声学的放大器为压力振幅维持扩大的功能。特别地，有一座水库的新奇声学的放大器使安装在引擎和冷却器之间的声学的透明却煤气的堵住的有弹性的膜可能。因此，引擎能把氮用作工作气体在低频率工作；并且同时，冷却器能仍然把氦用作工作气体维持它的高效。与这个新放大器，集中精力的 thermoacousticengine 驾驶的一个二阶段的脉搏试管冷却器的冷却温度到达了 18.7 K。
英文摘要：
A ＂double-gas acoustic amplifier＂ is introduced to couple a thermoacoustic heat engine and a two-stage pulse tube cooler in this paper. Compared with previous acoustic amplifiers, this new acoustic amplifier maintains the function of amplification for pressure amplitude. In particular, the novel acoustic amplifier with a reservoir makes it possible to install an acoustic transparent but gas blocking elastic membrane between the engine and the cooler. Thus, the engine can use nitrogen as the working gas to work at low frequency; and meanwhile, the cooler can still use helium as the working gas to maintain its high performance. With this new amplifier, the cooling temperature of a two-stage pulse tube cooler driven by an energy-focused thermoacoustic engine reached 18.7 K.
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