Magnetostrictive displacement sensor

Abstract

The present invention discloses a magnetoconstriction type displacement sensor which measures the displacement by using a time-difference displacement measuring method. A torsional wave is generated by crossing two different magnetic field and then the transmitting time of the torsional wave is computed, thus the displacement measuring can be performed indirectly and accurately. The magnetoconstriction type displacement sensor consists of a center control unit, a drive signal generator, a signal processing circuit, a high-speed timing circuit, a RS485 interface circuit, a power supply circuit and the wave guide filament.

Description

technical field [0001] The invention relates to a displacement sensor, in particular to a high-precision displacement sensor based on magnetostrictive technology. Background technique [0002] There are many displacement measurement methods, mainly including mechanical measurement, pneumatic measurement, electromagnetic measurement, and optical measurement. Among them, the electromagnetic measurement method can directly output electrical signals, which is convenient for automatic detection and control. Electromagnetic measurement methods can be divided into potentiometer type, Hall type, strain type, inductive type, magnetic grid type, eddy current type, capacitive type, magnetostrictive type and other forms. [0003] Potentiometer type displacement sensor has simple structure and circuit, low cost, but the mechanical structure is not firm; sliding wire type displacement sensor has a solid measurement structure, but poor resolution and large noise; strain type displacement ...

AI Technical Summary

Problems solved by technology

[0003] Potentiometer type displacement sensor has simple structure and circuit, low cost, but the mechanical structure is not firm; sliding wire type displacement sensor has a solid measurement structure, but poor resolution and large noise; strain type displacement sensor, small size, low cost, high sensitivity resolution The rate is high, but the measurement range is very small, which cannot meet the needs of large-range applications

The Hall type displacement sensor has simple structure, good dynamic response, high sensitivity resolution, and can be used for non-contact measurement, but it is greatly affected by the medium and temperature, and the nonlinearity is also large; the inductive displacement sensor has high sensitivity, reliable and firm structure, and temperature The influence of humidity and humidity is small, the resolution is high, and non-contact measurement can be realized, but the frequency response of the differential inductance type is low, and the differential transformer type has zero residual voltage, and the eddy current type is susceptible to the physical properties, geometry and size of the measured conductor. effect, and a narrow linear range

Capacitive displacement sensor has simple structure, good dynamic response, high sensitivity, high resolution, and can realize non-contact measurement, but it is greatly affected by medium and temperature

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