title: Impact force measurement of a spherical body dropping onto a water surface.
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.
authors.affiliation: School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Araki
authors.affiliation: School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Takita
authors.affiliation: School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ishima
authors.affiliation: School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kawashima
authors.affiliation: Faculty of Industry and Technology, Rajamangala University of Technology Isan, Thanyaburi 39 Muh1, Rangsit-Nakhonnayok Rd. Klong Hok, Thanyaburi Pathum Thani 12110, Thailand.
authors.forename: N
authors.initials: N
authors.lastname: Pornsuwancharoen
authors.affiliation: Faculty of Science and Technology, Kasem Bundit University, 1761 Pattanakarn Rd. Suanluang Bangkok 10250, Thailand.
authors.forename: S
authors.initials: S
authors.lastname: Punthawanunt
authors.affiliation: Faculty of Engineering, University of San Carlos, P. del Rosario Street, Cebu City 6000, Philippines.
authors.forename: E
authors.initials: E
authors.lastname: Carcasona
authors.affiliation: School of Science and Technology, Gunma University, Kiryu, Tenjin-cho 1-5-1, 376-8515, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Fujii