Can Inductance Proximity Sensors Detect Magnets Encased in Metal?

In summary, the conversation discusses the use of eddy currents to detect the position of a metal. It is mentioned that this method may not work if the target is a magnet enclosed in a metal casing. However, other options such as using resonance coils or reed switches, Hall sensors, or GMR sensors can be used to detect the magnetic field outside the casing. This technique is commonly used to measure fluid levels in a container.
  • #1
sensor
1
0
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 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
 
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  • #2
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
 
  • #3
sensor said:
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 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.
 
Last edited by a moderator:
  • #4
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.
 
  • #5


Hello,

Thank you for sharing this information about the inductance proximity sensor. It is a commonly used method for detecting metal objects and their positions.

To answer your question, yes, the inductance proximity sensor can still work if the target is a magnet enclosed in a metal casing. This is because the sensor will still detect the eddy currents induced by the magnet, even if it is inside a metal casing.

However, it is important to note that the sensitivity and accuracy of the sensor may be affected by the metal casing. The sensor may have a harder time detecting the magnet if the casing is very thick or made of a highly conductive material. In this case, it may be necessary to adjust the settings or use a different type of sensor.

I hope this helps answer your question. Best of luck with your project.

Sincerely,

 

Related to Can Inductance Proximity Sensors Detect Magnets Encased in Metal?

What is an inductance proximity sensor?

An inductance proximity sensor is a type of sensor that uses the principle of inductance to detect the presence of nearby objects. It works by measuring changes in the inductance of a coil caused by the presence of a conductive material, such as metal.

How does an inductance proximity sensor work?

An inductance proximity sensor consists of a coil and an oscillator. The oscillator sends out an alternating current through the coil, creating a magnetic field. When a conductive object enters this magnetic field, it causes a change in the inductance of the coil, which is detected by the sensor and triggers a response.

What are the advantages of using an inductance proximity sensor?

Inductance proximity sensors are non-contact, meaning they do not physically touch the object being detected. This makes them ideal for use in applications where physical contact could cause damage or interference. They are also highly reliable and have a long lifespan.

What are the common uses of inductance proximity sensors?

Inductance proximity sensors are commonly used in industrial and manufacturing settings for tasks such as detecting the presence of objects on a production line, detecting the position of machinery, and detecting the level of liquid in a tank. They are also used in security systems, such as automatic door openers, and in automotive applications.

How do I choose the right inductance proximity sensor for my application?

When selecting an inductance proximity sensor, consider factors such as the sensing range, operating voltage, and response time. It is also important to choose a sensor that is compatible with the material and shape of the objects you want to detect. Consult with a supplier or do research to determine the best sensor for your specific application.

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