Precise inclined platform device for static calibration of seismometer

Abstract

A precise inclined platform device for static calibration of a seismometer comprises a base, a mesa, a rotation mechanism, a drive mechanism, a detection mechanism and a support frame, wherein the rotation mechanism comprises a spindle, a drive arm, a rotary table and a balance block; the spindle is fixed on a left support frame and a right support frame; the drive mechanism and the balance block are respectively located on both sides of the drive arm; the drive mechanism includes a linear motor, a slide table, a linear guide rail, a slider and a grating ruler; the reading head of the grating ruler is fixedly connected with the base, and sends a zero-point signal of the grating ruler when the mesa is horizontal; the sliding table tightly butts against the drive arm, and pushes the rotation mechanism to rotate forward when the linear motor moves in the forward direction; the rotation mechanism can rotate reversely due to gravity action of the balance block when the linear motor drives the sliding table to move in the reverse direction; and the detection mechanism comprises a laser interferometer and a reflecting mirror for reflecting laser back to the laser interferometer to obtain rotation angle of the mesa. The precise inclined platform device has the advantages of high location accuracy, high transmission efficiency and wide application range.

Description

technical field [0001] The invention relates to a precision inclined platform device for static calibration of seismometers. Background technique [0002] For the accelerometer used in the strong motion network, the passband starts from zero, and the sensitivity can be considered to be the same at each frequency point in its passband, and the linearity can be considered to be consistent. Therefore, accurate measurement and calibration of the sensitivity and linearity of the accelerometer at the zero frequency point (or "static") can give the main characteristic parameters of the accelerometer in its passband (especially the low frequency band). [0003] At present, the typical precision tilting platform in China is an electronically controlled tilting platform for optical calibration. It is driven by a stepping motor and driven by a worm gear. Due to the existence of the transmission gap of the worm gear, the positioning accuracy is limited; The loss is large, so the transm...

AI Technical Summary

Problems solved by technology

[0003] At present, the typical precision tilting platform in China is an electronically controlled tilting platform for optical calibration. It is driven by a stepping motor and driven by a worm gear. Due to the existence of the transmission gap of the worm gear, the positioning accuracy is limited; The loss is large, so the transmission efficiency is low; the semi-closed-loop control can be realized after the encoder is installed, but the full-closed-loop control is not realized, and the control accuracy is also affected; in addition, the platform is not equipped with a high-precision tilt angle measuring device, and the tilt angle is measured by the motor It is converted from the given amount, resulting in a large measurement error

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