Helmholtz resonance technique for measuring liquid volumes under micro-gravity conditions |
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| Authors: | Akihiro Nakano Yasuo Torikata Tomoki Yamashita Tadaaki Sakamoto Yuka Futaya Takahisa Nishizu |
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| Affiliation: | (1) National Institute of Advanced Industrial Science and Technology, Energy Technology Research Institute, Distributed Energy System Group, 1-1-1 Namiki, Tsukuba East, Tsukuba, 305-8564 Ibaraki, Japan;(2) Mayekawa Mfg. Co., Ltd., Japan;(3) Guraduate School of Systems and Information Engineering, University of Tsukuba, Japan;(4) Graduate School of Agriculture Kyoto University, Japan |
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| Abstract: | The Helmholtz resonance technique has been investigated for measuring liquid volumes under micro-gravity conditions. We proposed a theoretical model of the Helmholtz resonance phenomenon induced in a closed container, and carried out a micro-gravity experiment to confirm the applicability of the measurement technique using water as a test liquid. A swept frequency signal was added to a loudspeaker, and together, a microphone and the loudspeaker picked up the sound of the Helmholtz resonance. The liquid volume was calculated from the Helmholtz resonance frequency using an equation derived from the theoretical model. The liquid volume obtained from the micro-gravity experiment agreed well with the liquid volume obtained under terrestrial conditions. Thus, it was confirmed that the Helmholtz resonance technique was applicable for measuring liquid volume under micro-gravity conditions. |
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