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Ultrasonic levitation accelerometer

An accelerometer, ultrasonic technology, applied in the measurement of acceleration, velocity/acceleration/shock measurement, measurement device, etc., can solve the problems of technology and cost contradiction, difficult to achieve high performance and low cost, achieve compact structure, processing and assembly High, the effect of eliminating mechanical elasticity

Inactive Publication Date: 2012-03-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasing demand for accelerometers in aerospace and other fields, the requirements for accuracy, anti-interference ability and sensitivity are also getting higher and higher. Currently, all kinds of accelerometers are facing the contradiction between technology and cost, and it is difficult to realize Unification of high performance and low cost

Method used

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  • Ultrasonic levitation accelerometer
  • Ultrasonic levitation accelerometer
  • Ultrasonic levitation accelerometer

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, the present invention is described in detail, as figure 1 As shown, the accelerometer of the present invention includes a housing made of cylinder wall 3, loam cake 1 and bottom cover 6. The upper end of cylinder wall 3 is loam cake 1, and the lower end of cylinder wall 2 is bottom cover 6. 5 is placed between the bottom cover 6 and the upper cover 1, the bottom cover 6 is provided with a piezoelectric ceramic sheet 7, the capacitor upper plate 2 is pasted on the lower surface of the upper cover 1, and the capacitor lower electrode is pasted on the upper surface of the suspension 5 plate 4.

[0011] The invention uses the inverse piezoelectric effect of the piezoelectric ceramic sheet to excite the vibration of the bottom cover, that is, the stator, thereby inducing its surface to form a near-field acoustic levitation, generating an acoustic levitation force supporting the suspended matter, so that the suspended matter is ...

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Abstract

The invention discloses an ultrasonic levitation accelerometer. The ultrasonic levitation accelerometer comprises a shell, wherein a suspended substance is arranged in the shell; a piezoelectric ceramic sheet is arranged at the bottom of the shell; and an upper polar plate of a capacitor is arranged on the lower surface of the interior of the shell and a lower polar plate of the capacitor is arranged on the upper surface of the suspended substance. Compared with the prior art, the ultrasonic levitation accelerometer is more compact in structure and has higher precisions in both processing and assembling; and meanwhile, the ultrasonic levitation accelerometer is more convenient to mount and apply. As no mechanical bearing structures are used for bearing the mass of a sensitive element, the influence on mechanical elasticity is eliminated; and the sensitivity of the accelerometer provided by the invention can be very high in theory.

Description

Technical field: [0001] The invention relates to an accelerometer in the field of inertial devices, in particular to an ultrasonic levitation accelerometer. Background technique: [0002] The accelerometer is a sensitive device that uses the inertial force of the detection mass to measure the acceleration of the carrier. The traditional accelerometers mainly include pendulum accelerometers, vibrating wire accelerometers and piezoelectric accelerometers. With the increasing demand for accelerometers in aerospace and other fields, the requirements for accuracy, anti-interference ability and sensitivity are also getting higher and higher. Currently, all kinds of accelerometers are facing the contradiction between technology and cost, and it is difficult to realize Unification of high performance and low cost. Therefore, it is necessary to propose a new principle and a new structure of the accelerometer with high precision, no electromagnetic interference and high sensitivity. ...

Claims

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Application Information

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IPC IPC(8): G01P15/097
Inventor 陈超王亮马忠良徐兆可
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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