| 摘要 |
An apparatus and a method for measuring the gravitational acceleration on the ground, comprising a base frame (31), a resonator (10) having a first d isc of sapphire (2) integral to said base frame (31), an a second disc of sa pphire (1) arranged at a minimum distance from said first mass (2) and align ed vertically with respect to said first mass (2) such that said first and s aid second disc (1 and 2) form a resonator for electromagnetic signals (10); a cantilever arm (41) connected to said base frame (31) and holding resilie ntly the second disc (1); a magnetic probe (11) for applying an electromagne tic signal to said resonator (10) arranged according to a plane existing bet ween the two discs (1 and 2); a linear electric probe (12), arranged under t he fixed disc (2) aligned vertically with respect to its side edge, for meas uring a resonance frequency of said resonator responsive to said electromagn etic signal, means for correlating the variation of said resonance frequency to a variation of distance between said discs (1 and 2), and means for corr elating the variation of distance to local gravitational acceleration.
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