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Micro mechanical acceleration sensitive structure for inhibiting crosstalk in high-precision single-shaft optical micro-accelerometer, and manufacturing method thereof

A technology of micro-accelerometer and sensitive structure, which is applied in the direction of velocity/acceleration/shock measurement, measurement acceleration, measurement device, etc., to achieve the effects of eliminating sensitive axial displacement and rotation, large acceleration-displacement sensitivity, and avoiding lobe compensation

Active Publication Date: 2016-03-02
ZHEJIANG UNIV
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Problems solved by technology

In order to solve the off-axis crosstalk problem in the high-precision single-axis optical micro-accelerometer based on the diffraction grating, the present invention proposes a highly symmetrical micro-mechanical acceleration sensitive structure based on a five-layer SOI substrate and its micro-machining manufacturing method. While ensuring the original measurement accuracy of the optical micro-accelerometer, it greatly suppresses off-axis crosstalk

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  • Micro mechanical acceleration sensitive structure for inhibiting crosstalk in high-precision single-shaft optical micro-accelerometer, and manufacturing method thereof
  • Micro mechanical acceleration sensitive structure for inhibiting crosstalk in high-precision single-shaft optical micro-accelerometer, and manufacturing method thereof
  • Micro mechanical acceleration sensitive structure for inhibiting crosstalk in high-precision single-shaft optical micro-accelerometer, and manufacturing method thereof

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Embodiment Construction

[0046] The implementation of the present invention will be described in detail below with reference to the drawings and specific examples, and those skilled in the art can understand other advantages and effects of the present invention from this description. It should be noted that the diagrams provided in this embodiment are only schematic diagrams to illustrate the basic idea of ​​the present invention, and the relevant components in the schematic diagrams are not necessarily drawn according to the number, shape and size of components in actual implementation. The shape, number, layout and proportion of each component may be more complicated.

[0047] The crosstalk-suppressing micro-mechanical acceleration sensitive structure provided by the present invention is applied to a high-precision single-axis optical micro-accelerometer. Output signal contrast and sensitivity when applied to acceleration. Such as figure 1 As shown, the high-precision single-axis optical micro-acc...

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Abstract

The invention discloses a micro mechanical acceleration sensitive structure for inhibiting crosstalk in a high-precision single-shaft optical micro-accelerometer, and a manufacturing method thereof. The micro mechanical acceleration sensitive structure comprises a bulk silicon sensitive mass block, four symmetrically distributed crab-leg-shaped cantilever beams, a silicon substrate connected with the cantilever beams, and a reflective film plated on the surface of the sensitive mass block. It can be ensured that the gravity center of the sensitive mass block is disposed at a center plane of the cantilever beams through a specially designed microprocessing process, the direction of the sensitive shaft of the single-shaft optical micro-accelerometer is vertical to the center plane, and thus off-axis crosstalk is fundamentally inhibited through adjustment of the position of the gravity center; and the micro mechanical acceleration sensitive structure cooperates with the diffraction grating based optical micro-accelerometer so that the off-axis crosstalk can be effectively inhibited under the condition that the sensitivity of high-acceleration measurement is ensured, the applied surface microprocessing technology can be compatible with an IC technology, and batch manufacture is realized.

Description

technical field [0001] The invention belongs to the technical field of optical micro-acceleration sensors, and relates to a micro-mechanical acceleration sensitive structure for suppressing crosstalk in a high-precision single-axis optical micro-accelerometer and a manufacturing method thereof. Background technique [0002] An accelerometer is a sensor that measures the basic physical quantity of acceleration. Its basic measurement principle is based on Newton's second theorem. The accelerometer usually includes a mechanical acceleration sensitive system and a displacement measurement system. The external acceleration causes the mass block in the mechanical acceleration sensitive system to produce a The displacement that has a definite relationship with the magnitude of the input acceleration, the displacement measurement system obtains the magnitude of the input acceleration by measuring the displacement. The performance of the accelerometer is determined by both systems si...

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Application Information

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IPC IPC(8): G01P15/00
CPCG01P15/00
Inventor 卢乾波白剑娄树旗焦旭芬韩丹丹
Owner ZHEJIANG UNIV
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