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Araki R, Takita A, Ishima T, et al. Impact force measurement of a spherical body dropping onto a water surface. Rev Sci Instrum. 2014;85(7):075108doi: 10.1063/1.4878629.
Araki, R., Takita, A., Ishima, T., Kawashima, H., Pornsuwancharoen, N., Punthawanunt, S., Carcasona, E., & Fujii, Y. (2014). Impact force measurement of a spherical body dropping onto a water surface. The Review of scientific instruments, 85(7), 075108. https://doi.org/10.1063/1.4878629
Araki, R, et al. "Impact force measurement of a spherical body dropping onto a water surface." The Review of scientific instruments vol. 85,7 (2014): 075108. doi: https://doi.org/10.1063/1.4878629
Araki R, Takita A, Ishima T, Kawashima H, Pornsuwancharoen N, Punthawanunt S, Carcasona E, Fujii Y. Impact force measurement of a spherical body dropping onto a water surface. Rev Sci Instrum. 2014 Jul;85(7):075108. doi: 10.1063/1.4878629. PMID: 25085174.
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Rev Sci Instrum. 2014 Jul;85(7):075108. doi: 10.1063/1.4878629.

Impact force measurement of a spherical body dropping onto a water surface.

The Review of scientific instruments

R Araki, A Takita, T Ishima, H Kawashima, N Pornsuwancharoen, S Punthawanunt, E Carcasona, Y Fujii

Affiliations

  1. School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
  2. Faculty of Industry and Technology, Rajamangala University of Technology Isan, Thanyaburi 39 Muh1, Rangsit-Nakhonnayok Rd. Klong Hok, Thanyaburi Pathum Thani 12110, Thailand.
  3. Faculty of Science and Technology, Kasem Bundit University, 1761 Pattanakarn Rd. Suanluang Bangkok 10250, Thailand.
  4. Faculty of Engineering, University of San Carlos, P. del Rosario Street, Cebu City 6000, Philippines.

PMID: 25085174 DOI: 10.1063/1.4878629

Abstract

We propose a method for measuring the impact force of a spherical body dropping onto a water surface. The velocity of the center of gravity of a metal spherical body, in which a cube corner prism is embedded so that its optical center coincides with the center of gravity of the sphere, is accurately measured using an optical interferometer. The acceleration, displacement, and inertial force of the sphere are calculated from the velocity. The sphere is also observed using a high-speed camera. The uncertainty in measuring the instantaneous value of the impact force with a sampling interval of approximately 1 ms is estimated to be 8 mN, which corresponds to 0.8% of the maximum force of approximately 1.0 N.

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