Patent ID: 8869712

Claim:
A precision tilting platform used for static calibration of seismometers characterized in that it comprises: a base, on which the following parts are provided: a worktable, a rotary part that connected to the worktable and rotates together with the worktable, a driving part that is operatively connected with and drives the worktable and rotary part to rotate through a linear motor, a measuring part that measures a tilting angle of the worktable, a left supporting frame and a right supporting frame that support the worktable and rotary part; wherein the rotary part is composed of a shaft around which the rotary part and the worktable rotate, a driving arm and a rotary table that fixed with the worktable, a clump weight that mounted on one end of the rotary table, the shaft is fixed on the left and right supporting frames; wherein the driving part and clump weight are assembled beside two opposite sides of the driving arm, the driving part includes the linear motor, a sliding table that connected to a rotor of the linear motor, a pair of linear guides and sliders that make the sliding table move along the linear guides, a grating scale that fixed on the sliding table to measure linear displacement of the linear motor, a readhead of the grating scale is fixed with the base and sends out a signal of zero position when the worktable is horizontal; where the sliding table contacts the driving arm, when the linear motor is moving forward, the rotary part is pushed by the sliding table and rotates toward a positive direction, when the linear motor is moving backward, the sliding table is pulled backward and the rotary part rotates toward a negative direction because of gravity of the clump weight mounted on the rotary table; wherein the measuring part is composed of a laser interferometer and a reflector that is spaced apart from the laser interferometer and reflects a laser beam emitted from the laser interferometer back to the laser interferometer to obtain the tilting angle of the worktable on which the reflector is mounted.