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A device for reducing the rotation error of falling objects in absolute gravimeters based on the torsion pendulum method

A technology of rotation error and meter falling, which is applied in the field of devices for reducing the rotation error of absolute gravimeter falling objects based on the torsion method

Active Publication Date: 2019-10-18
NAT INST OF METROLOGY CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing test methods are difficult to meet the above precision requirements

Method used

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  • A device for reducing the rotation error of falling objects in absolute gravimeters based on the torsion pendulum method
  • A device for reducing the rotation error of falling objects in absolute gravimeters based on the torsion pendulum method
  • A device for reducing the rotation error of falling objects in absolute gravimeters based on the torsion pendulum method

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Embodiment Construction

[0027] The present invention will be described more fully below using examples. This invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

[0028] For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" may be used herein to describe the relationship of one element or feature relative to another element or feature shown in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientatio...

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Abstract

The present invention discloses a device capable of reducing a falling body rotation error of a classical absolute gravimeter based on a torsion pendulum method. The device comprises an upper tungstenwire, a damping system, a lower tungsten wire, a falling body unit, a michelson interferometer, an angle detection system and an outer frame. The falling body unit can change the mass center positionvia tuning nut(s), and the falling body unit comprises a fine-tuning nut, a threaded rod, a metal protection box, a cube corner prism and a coarse-tuning nut. The damping system is used for suppressing the non-torsional mode of a falling body. According to the device, the deviation between the light center of the cube corner prism and the mass center of the falling body can be directly measured via the torsion pendulum method, the processing and assembling requirement of the falling body is reduced to a greater extent, the measurement of the high-precision falling body eccentricity is realized, and the disturbance of the falling body rotation error on the gravity acceleration is greatly reduced.

Description

technical field [0001] The invention belongs to the field of gravity measurement, and more specifically relates to a device for reducing the rotation error of a falling body of an absolute gravimeter based on a torsion pendulum method. Background technique [0002] The absolute gravimeter measures the acceleration of gravity by detecting the relationship between the falling position and time of a falling object in a vacuum very accurately, which is of great significance in the fields of earth and space science. When the falling body in the NIM-3A classic absolute gravimeter developed by the China Institute of Metrology is released, the simultaneity of the support point release cannot be guaranteed. Secondly, the line connecting the center of mass of the falling body and the optical center of the corner cube prism is not parallel to the horizontal plane, so When the falling body is in free fall, the optical center of the corner cube must rotate at a certain angular velocity a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/12G01V7/14
Inventor 冯金扬余烨王启宇吴书清李春剑胡翔包福
Owner NAT INST OF METROLOGY CHINA