Inductance proximity sensor

[sensor]

Hi

To detect position of a metal we can use the eddy currents induced by a current carrying inductor. It is described in this link.

http://www.marktec.co.jp/e/product/ndt/ect/principle.html [Broken]


Would this still work if the target is a magnet enclosed in a metal casing. Basically I need to detect the position of a magnet that is enclosed in a metal casing.

Thanks in advance

 

[davenn]

Hi sensor

welcome to PF :)

The metal case is likely to shield the magnetic field. It would probably depend on the sensitivity of the sensor used to if it could detect
any magnetic field that may or may not be outside the metal casing

Others may have more ideas :)

Dave

 

[zoki85]

Hi

To detect position of a metal we can use the eddy currents induced by a current carrying inductor. It is described in this link.

http://www.marktec.co.jp/e/product/ndt/ect/principle.html [Broken]


Would this still work if the target is a magnet enclosed in a metal casing. Basically I need to detect the position of a magnet that is enclosed in a metal casing.

Thanks in advance

The system will detect metal casing.
Modern metal detectors (like those on airports) usually use method of resonance coils.

 

[Mike_In_Plano]

If you place the magnet in a non-ferrous casing, such as copper, aluminum, titanium etc... Then, you can sense the field created by the magnet by using reed switches, Hall sensors, or GMR sensors.
This is a simple enough trick for measuring fluid levels in a container.