Absolute gravity measurement optical system and method with dual free falling bodies

A free fall, gravity measurement technology, applied in measurement devices, measurement of gravitational fields, geophysical measurement, etc., to achieve high-precision measurement, eliminate errors, and improve work efficiency.

Active Publication Date: 2017-09-22
北京奥地探测仪器有限公司 +1
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Problems solved by technology

However, in this scheme, in order to ensure that the upper and lower sets of optical paths do not affect each other completely, the two falling bodies have a distance of nearly 10cm in the horizontal direction in addition to the distance in the vertical direction. The effect is not big, so ignore it. In fact, if you want to further improve the accuracy of the instrument, you must solve this problem

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  • Absolute gravity measurement optical system and method with dual free falling bodies
  • Absolute gravity measurement optical system and method with dual free falling bodies

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027]Before describing the measurement system and measurement method provided by the embodiments of the present invention, the calculation formula of the true value of the absolute acceleration of gravity will be introduced first.

[0028] Let the true value of the absolute gravitational acceleration of a measured point on the earth be g 0 , the measured value is g c , the measurement error introduced by vibration during measurement is Δg, then

[0029] g c =g 0 +Δg (1)

[0030] Assuming that the two falling bodies fall synchronously and vertically at the vertical interval h, two measurement results can be obtained, and the measurement results obtained by the measurement of the upper and lower bodies are:

[0031] g cu =g 0u...

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Abstract

The invention discloses an absolute gravity measurement optical system with dual free falling bodies, which comprises a laser source, a falling body mechanism, an upper vacuum chamber, a lower vacuum chamber and an interferometer arranged between the upper vacuum chamber and the lower vacuum chamber, wherein the falling body mechanism comprises an upper falling body prism and a lower falling body prism which are exactly the same and are correspondingly arranged in the upper vacuum chamber and the lower vacuum chamber; the interferometer comprises a first interference system, a second interference system and a third interference system; after the laser source is incident to the interferometer and passes through the first interference system, the second interference system and the third interference system, three interference signals are generated for calculating the absolute gravity true value. The invention also provides a measurement method corresponding to the system.

Description

technical field [0001] The invention relates to, in particular, an optical system for measuring absolute gravity with double free fall, and also relates to a method for measuring absolute gravity with double free fall, which belongs to the field of high precision absolute gravity measurement. Background technique [0002] At present, the high-precision absolute gravimeter is a precision instrument integrating light, electricity, computer, and vacuum technology that has been studied internationally since the 1970s. It is widely used in scientific and national defense construction fields such as plane lifting, calibration of relative gravimeter drift, mineral exploration, and navigation technology. Since the 1960s, with the rapid development of deep space exploration and missile technology, the requirements for high-precision absolute gravity measurement in various fields have also been continuously improved, and countries all over the world have increased investment in the re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/04
CPCG01V7/04
Inventor 郭有光洪国强黄雯迪薛振海高铭泽
Owner 北京奥地探测仪器有限公司
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