Pulse tube cryocooler modulating phase via inertance tube and acoustic power amplifier thereof

摘要

A pulse tube cryocooler modulating phase via an inertance tube and an acoustic amplifier (A1, A2) provided in the pulse tube cryocooler are disclosed. The acoustic power amplifier (A1, A2) is made of a metal pulse tube (PT1, PT2) filled with regenerative materials, which are located at a distance of X from the hot end of the pulse tube. The length of the regenerative materials is L which meets the requirement of X−L0. The acoustic power amplifier (A1, A2) can be used not only in a single-stage pulse tube cryocooler, but also in a multi-stage pulse tube cryocooler thermally coupled or gas coupled. The regenerative materials may be any cold storage materials applicable at low temperatures, such as stainless steel wire mesh, lead pellet, lead thread et al. The acoustic power amplifier (A1, A2) can increase the acoustic power at the hot end of the pulse tube (PT1, PT2), which is advantageous to the phase modulation of the inertance tube, thereby the properties of the pulse tube cryocooler can be enhanced.