Vertical gravity gradient measurement system

Abstract

The invention provides a vertical gravity gradient measurement system which comprises a falling-body control system and a laser interference measuring system. The falling-body control system comprises a vacuum system, a servo drive system (2), an upper falling-body lifting unit (3), a lower falling-body lifting unit (4) and a drive piece (5); the laser interference measuring system comprises a laser light source (50), a third spectroscope (51), a first reflector (52), a first interference light path measuring unit and a second interference light path measuring unit. On the basis of the falling-body control system, upper and lower falling bodies are rigidly connected and move synchronously, errors in system natural vibration and environment vibration during operation are common-mode errors, vibration isolation of reference points is not needed, and the vibration errors cannot cause affect on measurement results. Therefore, the vertical gravity gradient measurement system has the advantages that the measurement results are high in precision, reliable and stable.

Description

technical field [0001] The invention belongs to the technical field of gravity gradient measurement, in particular to a vertical gravity gradient measurement system. Background technique [0002] On the Earth's surface, the vertical gravity gradient is about 308.6 microGal / m, which varies slightly with latitude and altitude. High-precision gravity gradient measurement data is useful for high-precision inertial guidance, earth science, space science and geology Science is important. In addition, gravity gradient measurement has been considered as one of the effective means of resource detection, and it has important application value in the fields of basic geological survey, basic geological research, oil and gas reserves and other resource exploration. [0003] A vertical gravitational gradiometer is an instrument that measures the vertical gravitational gradient of a measuring point on the earth's surface. In the prior art, the design principles of vertical gravity gradio...

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Problems solved by technology

[0004] However, the existing various vertical gravity gradient measurement methods are all relative measurement methods, which require reference coordinates and calibration o

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