Magnetostriction displacement sensor with compensation function

Abstract

The invention discloses a magnetostriction displacement sensor with a compensation function, comprising a sensor body and a magnet assembly, wherein the sensor body is internally provided with a skeleton, signal generating assemblies, a measuring circuit, a fixed block and a case, two signal generating assemblies are adopted, namely a measuring assembly and a compensating assembly, and the signal generating assemblies are arranged in two inner holes axes of which are mutually parallel on the skeleton. The measuring assembly comprises a measuring waveguide wire and a measuring coil, the compensating assembly comprises a compensating waveguide wire and a compensating coil, parameters of the measuring coil and the parameters of the compensating coil are completely the same, length of the measuring waveguide wire is different from the length of the compensating waveguide wire, and the measuring waveguide wire and the compensating waveguide wire are completely the same in other parameters. Electromagnetic interferences to the measuring coil and the compensating coil by the outside space at the same time are completely the same, and the measuring coil and the compensating coil are in a differential form, thus induction pulse output signals of the two coils are directly subtracted. Interference and noise in the total output signal output by the two induction coils are obviously reduced, thus detection accuracy and antijamming capability are obviously improved.

Description

technical field [0001] The invention relates to sensor technology, in particular to a technology of a magnetostrictive displacement sensor with a compensation function. Background technique [0002] The magnetostrictive displacement sensor uses the Wiedeman effect and the Villary effect of the magnetostrictive material to measure the absolute displacement. It has the advantages of large range, non-contact, high precision, fast speed and high protection level. , low cost and other excellent characteristics, so it is widely used in machinery, construction, machine tools and other industries. [0003] Since this kind of sensor works on the basis of electromagnetic signals, and at the same time it directly measures the time of the induction signal of the quantity, it will be affected by the electromagnetic interference of the space electromagnetic field (including the moving magnet assembly) during use, resulting in the introduction of various sensors into the measuring coil. I...

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Problems solved by technology

[0005] Since this kind of method not only improves the signal processing at the back end, but does not improve the signal-to-noise ratio from the source of the signal, the effect of reducing noise is greatly weakened.

Moreover, the circuit becomes very complicated, difficult to adjust, and it is difficult to further improve the accuracy

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