Translational gravity/acceleration measuring sensitive structure

Abstract

The invention discloses a translational gravity / acceleration measuring sensitive structure, which comprises a frame, a sampling mass cylinder, a variable-spacing capacitive displacement sensor and a reed group, and is characterized in that the sampling mass cylinder is connected with the variable-spacing capacitive displacement sensor; and one end of each reed group is in insulated connection with the side wall of the sampling mass cylinder, and the other end is in insulated connection with the inner wall of the frame. An upper acceleration compensation coil and a lower acceleration compensation coil which are connected in series, and an upper acceleration measuring coil and a lower acceleration measuring coil which are connected in series are respectively arranged outside the upper end and the lower end of the sampling mass cylinder. According to the invention, the deflection motion mode of the sampling mass cylinder is eliminated in principle, and the translational motion of the sampling mass cylinder in the measuring process is realized; the displacement measuring precision is improved; and the heat dissipation area of the coil is increased, assembling is easy, and the size is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of gravity / acceleration measurement, in particular to a translational gravity / acceleration measurement sensitive structure. Background technique [0002] Measuring gravity is essentially measuring (gravitational) acceleration. The gravity measurement of the moving base with ships or aircraft as the carrier is one of the important means to obtain high-precision gravity data on the surface, and its results have important applications in geodetic surveying, resource exploration and other fields (Lacoste L.J.B., Reviews of geophysics, 1967(5) , 477; Forsberg R. et al., 2015(6), 265; Hu et al., Navigation Positioning & Timing, 2017(4), 10). Gravity measurement on moving base is a good balance of measurement accuracy and measurement efficiency - portable gravimeter has high accuracy but low measurement efficiency, while satellite gravity measurement is efficient but has low accuracy in the short wavelength part o...

AI Technical Summary

Problems solved by technology

[0004] Among the many sensitive probes for gravity measurement, the quartz pendulum accelerometer is used in various types of gravimeters because of its small size. This probe comes from the mature technology of high-precision inertial navigation system, and there is a large Non-linear effect; the cable-pull precision pendulum probe with mechanical amplification ability represented by ZLS has high sensitivity. This technology comes from the static gravimeter of L&R company. However, the nonlinear effect in dynamic measurement is obvious and difficult to correct (YuanY.et al., Earth, planets and space, 2020, 72); the precise elastic gravimetric measurement structure represented by KSS and GT is a type of probe that has been proven to have better accuracy in commercial applications, but its disadvantage is that it is bulky And the weight is heavy, the price is high, the elastic structure needs to be constrained by multiple drawing wires and springs, and the assembly process and process are complicated

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