Abstract
Vibrations in cryocoolers are a recurrent concern to the end user. They appear in different parts of the acoustic spectrum depending on the refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling strength to the physical system under interest. Here, we use the piezospectroscopic effect in rare-earth doped crystals at a low temperature as a high resolution, contact-less probe for the vibrations. With this optical spectroscopic technique, we obtain and analyze the vibration spectrum up to 700 kHz of a 2 kW pulse-tube cooler. We attempt an absolute calibration based on known experimental parameters to make our method partially quantitative and to provide a possible comparison with other well-established techniques.
Highlights
Compared to liquid helium cryostats, cryocoolers open many perspectives in the scientific community
The high frequency region of the spectrum may have an impact on micro- or nano-mechanical resonators investigated at low temperatures to explore the quantum mechanical nature of massive objects14 or cryogenic mirrors for gravitational wave observation4 since both could have resonances falling into the high frequency range
We propose a new non-interferometric optical approach based on the piezospectroscopic effect in rare-earth doped oxide crystals at a low temperature
Summary
Compared to liquid helium cryostats, cryocoolers open many perspectives in the scientific community. The measurement and the reduction of the vibrations in a cryocooler are active subjects of research, finding applications in very different fields including metrology for gravitational wave detection, the definition of high stability oscillators, or as a routine instrument for fundamental research.. The measurement and the reduction of the vibrations in a cryocooler are active subjects of research, finding applications in very different fields including metrology for gravitational wave detection, the definition of high stability oscillators, or as a routine instrument for fundamental research.6–11 These prospects have motivated many studies to accurately measure the vibration spectrum and to model it up to few tens of kHz. The noise is essentially dominated by the low-frequency components driven by the compression cycle. We obtain and analyze a vibration spectrum up to 700 kHz and partially correlate our measurement with the direct acoustic recording of the rotary valve
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