Prestress type falling body prism release apparatus for absolute gravity meter

Abstract

A prestress type falling body prism release apparatus for an absolute gravity meter includes a vacuum cabin, a support plate, clamps, a falling body prism, prestress springs, a prism tray, a lifting tray, buffer springs, guide rails and a perspective window mirror, wherein the lifting tray is slidably connected with the guide rails. A lower end of each buffer spring is connected with an upper surface of the lifting tray. The guide rails penetrate the prism tray without contact. The prism tray is arranged above the buffer springs. After a process of lifting the falling body prism is completed, a lower end of each prestress spring is in contact with an upper surface of the prism tray, and the prestress springs are compressed and generate push-down prestress on the prism tray. When the falling body prism is released, the prestress separates the falling body prism and the prism tray. According to the apparatus, release time of the falling body prism can be shortened, effects of frictional force, and electromagnetic and electrostatic disturbing force on the falling body prism are small and the apparatus is beneficial to precise measurement of gravity.

Description

technical field [0001] The invention relates to a measuring device, in particular to a falling prism release device for a free-falling absolute gravimeter. Background technique [0002] The absolute gravity value of any point on the earth's surface is the resultant force of the gravitational force of the entire earth's mass and the inertial centrifugal force generated by the earth's rotation on the object of unit mass at the point, which is equal to the gravitational acceleration value of the point. The absolute gravimeter is the main precision measuring instrument used to directly measure the acceleration of gravity, and it is widely used in the fields of geophysical environment, earthquake, oil exploration, and measurement. The basic principle of the common absolute gravimeter is to use the Michelson laser interferometer method to measure the time and distance experienced by the object (falling prism) in the vertical direction under high vacuum conditions. According to the...

AI Technical Summary

Problems solved by technology

A Chinese utility model patent (Patent No. ZL 200720086464.4) discloses a free-fall gravimeter falling mass drop device. The scheme of the patent is: the falling prism of the free-fall gravimeter is clamped or released by the solenoid valve through the elastic chuck, The disadvantage is that when the solenoid valve releases the falling prism through the elastic chuck, the falling prism is only released under the action of gravity, the release time is long, and the friction, electromagnetic and static interference forces at the moment of release act on the falling prism for a long time , the release stability is not good, which is not good for the precise measurement of gravity (the "falling body mass" in the patent number ZL 200720086464.4 is called "falling prism" in the present invention, and "falling prism" is easier to understand)

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