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Pressure sensor of magnetic excitation vibrating cylinder

A pressure sensor and vibrating cylinder technology, applied in the direction of measuring fluid pressure, measuring fluid pressure, instruments, etc. through electromagnetic components, can solve the problems of high energy consumption, difficult mass production, and difficulty in closed-loop debugging.

Inactive Publication Date: 2004-11-17
TAIYUAN AERO INSTR
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

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

Method used

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  • Pressure sensor of magnetic excitation vibrating cylinder
  • Pressure sensor of magnetic excitation vibrating cylinder
  • Pressure sensor of magnetic excitation vibrating cylinder

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] The excitation circuit is the excitation source for the sensor. Transformation circuit, primary amplification, and secondary amplification all use high-impedance TL084 operational amplifiers, voltage-current converters use conversion transformers, and the shaping output is composed of micro-transistor BC187-16, MC78L05 three-terminal voltage regulator and voltage regulator ZMM4V7.

[0014] The conversion circuit converts the charge on the ceramic capacitor into a voltage, and amplifies the weak voltage through the primary and secondary amplification, and a part of the signal outputs a frequency signal after the shaping circuit. The frequency of this signal is the resonance frequency of the thin-walled cylinder. The other part is introduced into the excitation terminal through the voltage-current converter. When the frequency of the feedback signal is the same as the natural frequency of the thin-walled cylinder resonance, a closed-loop positive feedback is formed, and th...

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Abstract

The invention is a kind of magnetism motivation vibration cylinder pressure sensor, which belongs to resonance pressure sensor; the measuring precision is high, the structure is simple, the size and weight is small; the invention includes sensitive elements and motivation circuit; the sensitive elements include insulator, insulator base, thin-wall cylinder, vacuum cavity protecting cylinder, conducting core, spring presser bits, ceramic capacitance, rare earth magnet, soft magnet, base, pressure accessing aperture, localization pin and wires; the two ends of the vacuum cavity protecting cylinder are connected with the insulator base and the thin-wall cylinder base, and forms a vacuum cavity; the conducting core is set in the thin-wall cylinder, the upper part is connected with the aperture tightly, the rare earth magnet is set at two sides of the magnet or around the magnet through the spring presser bits; there distributes four symmetrical arc ceramic capacitances boards which has gap with the thin-wall cylinder around the cylinder, the ceramic capacitance boards are fixed through localization pin and soft magnet.

Description

technical field [0001] The invention relates to a vibrating cylinder pressure sensor, belonging 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 object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a magnetic excitation vibrating cylinder pressure sensor with high measurement accuracy, simple structure, small size and weight, and eas...

Claims

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Application Information

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IPC IPC(8): G01L9/00
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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