We describe a system of capacitive transducers applied to two free falling objects with the aim of detecting differential accelerations due to nonNewtonian components. The two objects have a cylindrical shape to minimize the systematic errors and they fall in a microgravity condition inside a vacuum tube released by a stratospheric balloon at an altitude of 40 km. The calibration of the capacitive transducers performed in laboratory has shown that it is possible to detect differential accelerations Dgr;alsim; 1.4 times; 10minus;10mthinsp;sminus;2.
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