Cảm Biến Điện Dung Và Nam Châm - P2

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Introduction

to capacitive

and magnetic

Capacitive Sensor

Sensor electrode

Shielding

Printing board

Housing

Physical Basics

s

Sensor electrode

Shield Target

Types of Influences 1 Conductive, earthed target Conductive, insulated target

In both applications an inductive sensor should be used!

Types of influences 2

Non conductive target

εr

εr

Reduction Factor

Reduction factor

Oscillator Circuit

Applications

other non conductive materials

also thru non conductive walls

Principle Magnetic Sensor

Ferrite core Housing

Detection Area

If the magnet is turned of

90° this happens 2 switching

Detection area has two

minor lobes

==> 3 switching points, if the

magnet is too close to the sensor

Principle

Formatting of the cylinder wall

Direction of the field without magnet

Direction of the field with magnet

Application

☞ Sensor for the detection of position of pistons

in hydraulic cylinders (thru FE-metalls)

Integration the magnets

Bore hole

Magnet mounting ring

Piston Magnet Cylinder wall

Piston rod Sealing