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Device for measuring lower or upper limits of physical variable for e.g. inertial mass, has vacuum-torsional pendulum including cavity, whose wall is made of porous material with pores that fill specific percentages of pendulum volume
Device for measuring lower or upper limits of physical variable for e.g. inertial mass, has vacuum-torsional pendulum including cavity, whose wall is made of porous material with pores that fill specific percentages of pendulum volume
The device has a vacuum-torsional pendulum (101) with periodic time of more than 1 hour. The pendulum includes a central cavity close to a rotational axis and filled more than 80 percentages of a volume of the pendulum, where the pendulum has a hollow-cylindrical geometry. A wall of the central cavity is made of vacuum-sealed porous material e.g. foamed aluminum and honey-comb structure, where pores in the porous material fill the 80 percentages of the volume of the pendulum. A vacuum-torsional pendulum body is connected with a retaining wire over a conical disk or a hemispherical element. An independent claim is also included for a method for measuring lower or upper limits of a physical variable.
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