Fig. 3: Pressure amplitude limited by relief valve at ambient temperature.
From: Dynamic acoustic optimization of pulse tube refrigerators for rapid cooldown
The pressure oscillation measured at the inlet of the commercial PTR shown in Fig. 1b when the first and second stages were regulated near ambient temperature (solid line) and when no heat was applied to the cold ends in a steady state (dotted line). For both lines, the PTR was operated with the frequency and main orifice settings that produce optimal performance at base temperature.
