Inductance approach switch sensor

Abstract

The invention provides an inductance approach switch sensor comprises a coil detection circuit unit, a signal processing circuit unit, a detection coil unit facing a detected object, and an excitation circuit unit for supplying an excitation signal for the detection coil unit, wherein the signal processing circuit unit is connected with the output end of the coil detection circuit unit. The inductance approach switch sensor has the advantages of simple and compact structure, low cost, reliable and stable operation, wide application range, high measurement accuracy and the like.

Description

technical field [0001] The invention mainly relates to the design field of sensors, in particular to an inductive proximity switch sensor. Background technique [0002] like figure 1 As shown, the inductive proximity switch sensor uses the principle of induced eddy current. When the coil with high-frequency current is close to the metal to be measured, the high-frequency current on the coil generates an induced eddy current on the detected metal, which in turn affects the equivalent inductance of the coil. The size is related to the overlapping area of ​​the coil and the measured metal surface, the geometric size of the measured metal, the vertical distance from the coil to the measured metal surface, the geometric shape, geometric size, number of turns, electrical conductivity, magnetic permeability and other parameters of the flat coil . [0003] The effective action distance of the inductive proximity switch has a corresponding relationship with the size, thickness and...

AI Technical Summary

Problems solved by technology

However, if the installation distance of two ordinary inductive proximity switches is too small, it will cause mutual influence and thus cannot work properly

In this way, ordinary proximity switch sensors cannot be used in working conditions with high requirements for discrimination.

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