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Absolute gravity measuring system and measuring method as well as falling method of free-falling body

A free fall and gravity measurement technology, applied in the laser interferometry device to measure absolute gravity, in the field of free fall, can solve the problems of measurement result deviation, phase noise, etc., to eliminate measurement deviation, reduce the impact of vibration, and improve accuracy Effect

Active Publication Date: 2014-06-25
北京普测时空科技有限公司
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Problems solved by technology

[0009] However, the circuit system of the zero-crossing detector and time interval analyzer in the existing laser interferometry device may introduce nonlinear phase noise. This method of using hardware circuits to obtain the zero-crossing point characteristics of the laser interference fringe signal may introduce Non-linear phase noise, resulting in a certain deviation in the measurement results

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  • Absolute gravity measuring system and measuring method as well as falling method of free-falling body
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  • Absolute gravity measuring system and measuring method as well as falling method of free-falling body

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0041] figure 1 A schematic structural view of the absolute gravimetric measurement system of the present invention is shown.

[0042] figure 2 A specific structural diagram of the absolute gravimetric measurement system of the present invention is shown.

[0043] Such as figure 1 and figure 2 As shown, the absolute gravity measurement system of the present invention mainly includes a free fall device 1 , a laser interferometry device 11 and a vibration isolation platform 4 .

[0044] Free-fall device 1 is used to realize the free-fall motion of object, and it mainly comprises following parts: vacuum chamber 1; image 3 , Figure 4 ), which is used to repeatably and stably realize the free-fall motion of the falli...

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Abstract

The invention discloses an absolute gravity measuring system and measuring method as well as a falling method of a free-falling body. The absolute gravity measuring system comprises a free-falling body device, a laser interference measuring device and a vibration isolation platform, wherein the free-falling body device is used for realizing free-falling motion of a falling object; the laser interference measuring device is used for measuring displacement generated during the free-falling motion of the falling object, and can realize accurate calibration of a measuring beam in a vertical direction by adopting a simplified structure; and the vibration isolation platform is arranged between the laser interference measuring device and the ground and is used for isolating influence of ground vibration on measurement. The absolute gravity measuring system has the beneficial effects that free-falling motion of the falling object is realized by adopting an elastic falling member suspension method, vibration influence of a motor drive system on the free-falling body device is reduced, and the accuracy of the gravity measuring result is improved; meanwhile, the zero crossing point (ZCP) feature of an interference fringe signal is computed by computer software so as to eliminate possible measurement deviation caused by a hardware circuit.

Description

technical field [0001] The invention relates to an absolute gravity measurement system, a measurement method and a free fall method, in particular to a system, a measurement method and a free fall method for measuring absolute gravity using a laser interferometry device. Background technique [0002] Accurately measure the gravitational acceleration on the earth's surface (g, the common value is 9.81m / s 2 ), which is of great significance and widely used in the fields of geophysics, surveying and metrology, and resource exploration. With the development of laser and time-frequency technology, the use of laser interferometry to measure absolute gravity has become the current mainstream technical solution. [0003] The existing absolute gravity measurement system mainly realizes the precise measurement of gravitational acceleration through laser interferometry, which accurately measures the free-fall trajectory of an object in a high vacuum environment, and based on the measu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/14
Inventor 王力军胡华伍康
Owner 北京普测时空科技有限公司
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