A magnetostrictive liquid level sensor

Abstract

The invention discloses a magnetostriction liquid level sensor which comprises a sensor head, a measuring rod and a floating ball assembly. The measuring rod is fixedly connected with the sensor head. The floating ball assembly is installed on the measuring rod and can freely move along a shell of the measuring rod. The sensor head internally comprises a fixed base, a measuring circuit module, an outer shielding case and a coil shielding case. The measuring circuit module comprises a coil, a measuring circuit board and a return wire. The measuring circuit board is installed on the fixed base. The coil is installed on the measuring circuit board. The coil shielding case covers the coil to shield the coil. The outer shielding case is installed on the fixed base, and covers the measuring circuit board and the coil to shield the measuring circuit module. The magnetostriction liquid level sensor is high in space utilization rate and capable of effectively reducing noise and influences of electromagnetic interference, and has the advantages of being high in anti-interference capability, high in measuring precision and the like.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a magnetostrictive liquid level sensor that can work normally in a strong electromagnetic interference environment. Background technique [0002] The magnetostrictive liquid level sensor is a tool that uses the Wiedemann effect of magnetostrictive materials to generate a strain pulse signal through the intersection of two different magnetic fields to accurately measure the position. The measurement implements the non-contact measurement of absolute position, which has the advantages of large range, high precision and high reliability, and is widely used in various position measurement. [0003] However, since the magnetostrictive liquid level sensor signal is generated based on the magnetic field generated by the current pulse, and the signal acquisition adopts coil-like inductive devices, these sensitive devices or magnetic fields are easily affected by various disturbances, esp...

AI Technical Summary

Problems solved by technology

[0005] (1) The coil is easily affected by strong electromagnetic interference, resulting in distortion of the pulse signal acquisition by the coil, abnormal signal output, and inaccurate measurement;

[0006] (2) The product lacks a protection circuit under strong surge voltage and surge current conditions, which may easily lead to damage;

[0007] (3) The output signal of the product jumps and cannot work normally under the working environment induced by electric fast transient burst and radio frequency electromagnetic field;

However, when the product is in a strong electromagnetic interference environment, it cannot work normally like in an ordinary environment

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