Abstract
The effect of dissipation on frequency characteristics of tuning forks was measured, the dissipation being induced by acoustic radiation of different wavelengths, excited by tuning forks. The tuning forks have been immersed in the superfluid helium. The fork resonance frequencies 32, 77 and 99 kHz have been measured at T=370 mK in the pressure range between SVP and 24.9 atm. Most of the tuning forks have been studied in a commercial can. It is found that at wavelength λ>0.6 cm the frequency dependence is determined by the relationship between density and pressure. It is established that a decrease in wavelength enhances influence of the acoustic radiation on the fork oscillation frequency. In the case where the sound wavelength is equal to the can internal diameter an acoustic resonance occurs. The frequency reaches values higher than the fork frequency in vacuum. Further reduction of the sound wavelength leads to the situation when the resonant frequency is similar to the frequency at long wavelengths.
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Acknowledgements
The authors would like to express their thanks to E. Rudavskii, K. Nemchenko and O. Kirichek for their useful discussion. The research was supported by the STCU grant (Project 5211) and the Russian Foundation of Fundamental Research (Project 10-2012).
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Gritsenko, I., Zadorozhko, A. & Sheshin, G. Frequency Characteristics of a Quartz Tuning Fork Immersed in He II. J Low Temp Phys 171, 194–199 (2013). https://doi.org/10.1007/s10909-012-0771-8
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DOI: https://doi.org/10.1007/s10909-012-0771-8