High-precision micro-gravity acceleration measurement device and method based on quantum weak measurement

A technology of acceleration measurement and microgravity, which is applied in the field of quantum optics, can solve the problems of late start of the gravimeter, the influence of the measurement accuracy of the acceleration of gravity, and zero drift.

Active Publication Date: 2018-12-21
SICHUAN UNIV
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Problems solved by technology

It is not difficult to see that although the measurement efficiency of the relative gravimeter has been improved, there will be a "zero point drift" phenomenon, which may affect the measurement accuracy of the acceleration of gravity
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  • High-precision micro-gravity acceleration measurement device and method based on quantum weak measurement
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  • High-precision micro-gravity acceleration measurement device and method based on quantum weak measurement

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Embodiment

[0043] The high-precision microgravity acceleration measurement device based on quantum weak measurement provided by this embodiment, such as figure 1 As shown, it includes a gravity sensing unit, a Sagnac interferometer, a laser emitting unit, a light receiving detection unit and a data processing unit.

[0044] The gravity sensing unit includes a cantilever beam 2 and a first equivalent counterweight 4 and a second equivalent counterweight 4' located at both ends of the cantilever beam. The cantilever beam 2 is fixed on a horizontally placed base by a hairspring spring 1, and the hairspring spring 1 One end is connected to the cantilever beam 2, and the other end is connected to the base. At this time, the working length of the hairspring spring is the total length of the hairspring spring. Elastic modulus E=1*10 of the hairspring spring used in this embodiment 11 Pa, hairspring width b=1*10 -2 m, hairspring thickness h=1*10 -3 m, the total length of hairspring i=1*10 - ...

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Abstract

The invention discloses a high-precision micro-gravity acceleration measurement device and a method based on a quantum weak measurement; the micro-gravity acceleration measurement device comprises a gravity sensing unit, a Sagnac interferometer, a laser emitting unit, a light receiving and detecting unit and a data processing unit, wherein coupling the gravity sensing unit with the Sagnac interferometer based on the quantum weak measurement, amplifying micro-displacement changes in different gravitational field environments of cantilever beam through deflection of polarized light in the Sagnacinterferometer, so that accurate measurement of gravitational acceleration micro changes is realized; the gravity acceleration measurement precision can reach 10<-10>, and the high-precision micro-gravity acceleration measurement device has very high measurement precision, can be applied to gravity assisted navigation in mine exploration, passive navigation technology, ocean gravity measurement,aviation gravity measurement and the like, and has an important application prospect.

Description

technical field [0001] The invention belongs to the technical field of quantum optics, relates to a gravitational acceleration measurement technology, in particular to a high-precision microgravity acceleration measurement device and method based on quantum weak measurement. Background technique [0002] The earth's gravitational field is the basic physical field of the earth's exterior and interior. Because the earth's topography and landforms are different everywhere, and the plate tectonics and geological structures are also varied in thousands of places, these factors have caused the irregular distribution of the earth's internal mass, resulting in the uneven distribution of the earth's gravitational field in space. How to accurately measure the distribution of the earth's gravitational field is of great significance in many fields (such as tidal fixation observation, crustal deformation observation and gravity exploration, etc.). For example, gravity-assisted navigatio...

Claims

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Application Information

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IPC IPC(8): G01V7/00G01V7/02
CPCG01V7/00G01V7/02
Inventor 张志友易李城董庭瑞文润
Owner SICHUAN UNIV
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