Pressure sensor of piezoelectric excitation vibrating cylinder

A pressure sensor and vibration excitation technology, applied in the direction of fluid pressure measurement using piezoelectric devices, can solve problems such as high energy consumption, difficulty in mass production, and difficulty in closed-loop debugging.

Inactive Publication Date: 2004-11-17
TAIYUAN AERO INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of sensor has high measurement accuracy, but its structure is complex, closed-lo

Method used

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  • Pressure sensor of piezoelectric excitation vibrating cylinder
  • Pressure sensor of piezoelectric excitation vibrating cylinder

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] The excitation circuit is the excitation source of the sensor. Impedance transformation, low-pass filter, high-pass filter and phase compensation all use high-impedance TL084 operational amplifier, the gain amplifier adopts high-impedance TL082 operational amplifier, and the shaping circuit is composed of microtransistor BC187-16 and MC78L05 three-terminal voltage regulator and voltage regulator Tube ZMM4V7 constitutes.

[0014] When the deformation force of the thin-walled cylinder is picked up by the piezoelectric element, the charge is generated by the positive piezoelectric effect, which is converted into a voltage signal by the charge converter, and then extracted by a band-pass filter composed of a low-pass filter and a high-pass filter. available signal; then the phase of the signal is adjusted through the phase compensation circuit, and then the signal is limited and amplified. A part of this signal is output by the shaping circuit, the frequency of the output ...

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Abstract

The invention is a kind of piezoelectric driving vibration cylinder pressure sensor, which belongs to vibration cylinder pressure sensor; the product has a high precision, excellent stability, and the structure is simple, easy to be produced; the invention includes the sensitive elements and motivation circuit; the sensitive elements include pressure aperture, a vacuum protecting cylinder, an outer cylinder, a thin-wall cylinder, a piezoelectric element, a cover ring, a cover base, connectors, insulator and inner wiring board; the cover base is set with an insulator, the thin-wall cylinder and the vacuum protecting cylinder are connected by cover ring; the aperture and the cover ring are connected through an outer cylinder. A pair of piezoelectric elements is pasted at two sides of the sensitive thin-wall cylinder, the wire on the piezoelectric element passes through the connector on the inner wiring board, and connects with the outer circuit through insulator; the sensitive element structure is welded with vacuum electron beam welding type.

Description

technical field [0001] The invention relates to a vibrating cylinder pressure sensor, which belongs to a resonant pressure sensor. technical background [0002] The vibrating cylinder pressure sensor was first invented in the UK. Its working principle is to use the weak transformation of the magnetic gap when the cylinder resonates to change the current of the excitation and pickup coils. After amplification, closed-loop excitation and output, the corresponding relationship between pressure and frequency is achieved. This kind of sensor has high measurement accuracy, but its structure is complex, closed-loop debugging is difficult, energy consumption is large, and it is not easy to mass produce. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a piezoelectric excitation vibrating cylinder pressure sensor with high precision, good stability, simple structure and easy mass pr...

Claims

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Application Information

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IPC IPC(8): G01L9/08
Inventor 秦杰樊尚春栗宏波刘广玉王大刚宋继红
Owner TAIYUAN AERO INSTR
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