Miniaturized absolute gravimeter based on micro-nano chip

Abstract

The invention discloses a miniaturized absolute gravimeter based on a micro-nano chip, relates to the field of absolute gravity measurement, and aims to overcome the defect that a power system and an optical path system of a traditional absolute gravimeter are complex, reduce the size and the mass of an absolute gravity measurement system and meet the engineering use requirements of miniature gravity measurement. The miniaturized absolute gravimeter based on a micro-nano chip comprises a 980nm laser, an optical fiber isolator, a wavelength division multiplexer, the micro-nano chip, a 1550nm laser, an optical fiber circulator, a photoelectric detector, an A / D converter, an FPGA chip, a single-mode optical fiber, a polystyrene bead, a capillary tube and an electric injector. A stable polystyrene sphere sequence is output through an electric injector, polystyrene spheres are captured and emitted through 980 nm laser, and then the local absolute gravity value is measured through the 1550 nm laser interference effect. Gravity measurement is achieved through combination of the micro-nano chip and the optical fiber optical path, the size and power consumption of the gravimeter are greatly reduced, and the gravimeter can be suitable for absolute gravity measurement application scenes with limited sizes.

Description

technical field

[0001] The invention belongs to the field of absolute gravity measurement, in particular to a miniaturized absolute gravity meter based on a micro-nano chip. Background technique

[0002] Precise gravitational acceleration measurement has applications in many fields, such as geophysics, metrology, inertial navigation and positioning, resource exploration, scientific research, etc. The distribution of the earth's gravity field can reflect the distribution of material density inside the earth, and has a great impact on geological structures, earth The shape, the modeling of the Earth's rotation, etc. have important implications. The calculation of the geoid requires accurate knowledge of the gravity data of multiple gravity base stations around the world, and also requires local airborne gravity measurement data as a supplement. Long-term gravity monitoring near volcanoes and earthquake-prone areas can help predict the movement trend of the earth's crust to re...

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