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Quadrature ring-type piezoelectric accelerometer

A piezoelectric accelerometer and accelerometer technology, applied in multi-dimensional acceleration measurement, acceleration measurement using inertial force, etc., can solve the problems of large lateral interference and large volume, and achieve small lateral interference, high sensitivity, and simple manufacturing process Effect

Inactive Publication Date: 2009-02-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The piezoelectric accelerometers currently on the market are mostly single-axis and two-axis accelerometers. The three-axis accelerometer is generally composed of a two-axis accelerometer and a single-axis accelerometer. Because of symmetry, the lateral interference is also large

Method used

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  • Quadrature ring-type piezoelectric accelerometer
  • Quadrature ring-type piezoelectric accelerometer
  • Quadrature ring-type piezoelectric accelerometer

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Embodiment Construction

[0024] Below in conjunction with the accompanying drawings, the present invention will be further described in detail through examples, but the scope of the present invention will not be limited in any way.

[0025] Such as Figure 5 As shown, the sensitive unit of the accelerometer is composed of a mass 51, four elastic arms 52, a base 53 and eight piezoelectric sheets 54, and the four elastic arms 52 are opposite to each other to form an orthogonal ring-shaped symmetrical structure. The sheet piezoelectric sheet 54 is symmetrically pasted on the inner and outer surfaces of the elastic arm (see Image 6 ). The material used for the piezoelectric sheet 54 is PVDF, and the elastic arm 52 is a semi-circular ring made of brass. The piezoelectric sheet 54 and the elastic arm 52 are pasted and fixed with epoxy resin. If necessary, a small amount of silver paste can be used to make the piezoelectric sheet The electrical reliable connection is ensured between the sheet 54 and the e...

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Abstract

The present invention provides a piezoelectric accelerometer. The sensitive components are arranged axisymmetrically; the piezoelectric accelerometer comprises four flexible arms, a quality block and a base; the flexible arms are folded and shaped like a ring or an arc; any two of the flexible arms are arranged opposite to the other two so as to form an orthogonal annular symmetric structure which connects the quality block and the base; and the flexible arms are made of piezoelectric material or the piezoelectric sheets are symmetrically pasted on the flexible arms. The accelerometer can perform the three-axis measurement, and because of the structural symmetry, when the axial acceleration is measured, the response of the transverse acceleration can be reduced; when the transverse acceleration is measured, the response of the axial acceleration can be reduced; therefore, the interference between the channels is inhibited to the lowest degree. The three-way accelerometer has the characteristics of high sensitivity, small transverse interference and simple manufacturing process, and can be used in the industrial production, the scientific research and the national defense field.

Description

technical field [0001] The invention belongs to the technical field of sensors and transducers, and in particular relates to a piezoelectric accelerometer. Background technique [0002] Sensor technology is the cutting-edge technology of modern technology and one of the three pillars of modern information technology. Its level is one of the important symbols to measure the level of a country's technological development. Accelerometers are widely used in aerospace as a sensor , automotive industry, automation control, robotics, biomedicine and military fields. [0003] Accelerometers can be divided into piezoelectric, capacitive, moving coil, piezoresistive, tunnel, torsion, force balance, resonant, optical fiber, temperature effect and other accelerometers according to the sensitive material of the sensor; The sensed direction can be divided into single-axis accelerometer and multi-axis accelerometer. [0004] Although there are many types of accelerometers, piezoelectric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/09G01P15/18
Inventor 李朝晖喻飞雄
Owner PEKING UNIV
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