Optical fiber Fabry-Perot interferometer-based gravity gradient measurement method

Abstract

The invention discloses an optical fiber Fabry-Perot interferometer-based gravity gradient measurement method, which is applicable to the application fields of the inertial navigation technology. In the method, both ends of the cavities of an optical fiber Fabry-Perot interferometer are respectively fixed on two mass blocks of a flexible mechanism, and the two mass blocks are respectively connected with a supporting structure through flexible hinges; because of the affection of gravity gradient, the upper and the lower mass blocks shift differently, as a result, the optical fiber Fabry-Perot cavities fixed on the two mass blocks are changed, and by interferometrically measuring the changes of the cavities, gravity gradient is worked out. The method adopts double-optical fiber Fabry-Perot cavity and double-point measurement and a mean value, the light source is generated by the same light source split beam, and thereby the affection of light source instability and the like on the measurement result is eliminated; since the measurement result is the mean value of the changes of the two cavities, the affection of luminous power and the like is eliminated; the flexible mechanism is composed of the eight flexible hinges, which are symmetrically arranged on both sides, consequently, the stability of the system can be guaranteed, and the measurement precision in the vertical direction can be increased.

Description

technical field [0001] The invention relates to gravity gradient, optical fiber Fabry-Perot interferometer and flexible mechanism technology, and is especially suitable for the application field of inertial navigation technology. Specifically, it refers to a gravity gradient measurement method based on optical fiber Fabry-Perot interferometer. Background technique [0002] The measurement of gravity field plays an important role in the fields of national defense and civil aerospace, geophysics, underground resource exploration, ocean, space technology, military application and environmental science. An indispensable aspect of understanding the earth, it will play more and more roles in physical prospecting, earthquake and sea level monitoring, accurate determination of the geoid, vertical deformation of the crust, etc., especially in the field of inertial navigation, measuring the gravity gradient , and then through the space integration of the gravity gradient, the gravity ...

AI Technical Summary

Problems solved by technology

[0003] The existing gravity gradiometer mainly includes four types: rotating accelerometer gravity gradiometer, electrostatic levitation gravity gradiometer, superconducting gravity gradiometer and atomic interference gravity gradiometer. The disadvantages of difficulty and high environmental requirements, especially the superconducting gravity gradiometer with the highest precision now require harsh low-temperature working conditions and expensive production and maintenance costs

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