Standard Sensors
Magneto-optical sensors for stray field visualization have a fixed working range with regard to sensitivity and magnetic field strength. The following overview shows selected properties of each sensor type. All property values are valid for RT = 23°C. The optical and magnetic resolution depend on the test system.
The following overview shows the potential of magneto-optical sensors on the basis of typical applications. In general, soft magnetics and hard magnetics, with preferably flat geometry can be tested under direct contact between sample and sensor surface.
Field of application / material testing | Type A | Type B | Type C | Type D |
---|---|---|---|---|
Stray field testing of permanent magnets (dipole, multipole) | o | x | x | o |
Characterization of magnetic linear encoders | o | x | xx | o |
Characterization of magnetic rotary encoders | o | x | xx | o |
Stray field testing of polymer-bonded magnets | x | xx | x | x |
Domain observation of electrical steel sheets (static) | xx | - | - | o |
Domain observation of electrical steel sheets (dynamic) | xx | - | - | o |
Detection of magnetic inks / banknote verification (remanent) | xx | o | - | x |
Detection of soft magnetic inks / banknote verification (bias-supported) | o | - | - | xx |
Reading information from magnetic stripe cards | xx | o | - | x |
Reading the magnetic information of tickets | xx | o | - | x |
Characterization of superconductors (cryogenic range) | - | o | x | - |
Detection of manipulated audio / video tapes (forensics) | x | x | - | o |
Checking serial numbers (stamped numbers in steel) | xx | - | - | o |
Detection of residual magnetization in permanent magnets | xx | x | o | x |
Stray field control of holding magnets | x | xx | x | x |
Imaging of magnetic microstructures | o | xx | o | o |
Legend Suitability: xx Very good
x Good
o Restricted
- None