High resolution magneto-optical visualization of magnetic fields

The CMOS-MagView is a digital magneto-optical readout system for fast and accurate visualization of magnetic field structures and field strengths. It is suitable for real-time stray field analysis and quality testing. Magnetic stray fields on EC and credit cards, magnetic encoders and di- and multipolmagnets can be visualized.

Visualization of magnetic fields  

The CMOS-MagView can visualize magnetic flux densities and their changes in optical resolution. Inhomogeneities and cracks in ferromagnetic materials can be shown directly using our sensitive magneto-optical sensors. For a measurement the sensor must be applied to the surface which holds the magnetic information. The Magview-software enables the analysis of magnetization properties and the documentation of the specimen.

Functional principle:

• Generation of homogeneous, linear polarized light (LED & polarizing filter)

• Change of the polarization status and reflection of light in the magneto-optical sensor dependent on the applied local magnetic field

• Visualization of the generated inhomogeneous polarization of the light as a local intensity alteration via a second polarizer

• Recording of the magneto-optical image by using a  standard optical camera

Technical Features:

• Direct visualization of magnetic fields

• Analysis of polarity, homogeneity, material and magnetization properties and local flux density

Fields of Application:

• Quality control of permanent magnets (single and multipole magnets)

• Visualization of magnet stripe card information

• Analysis and visualization of magnetic tapes (audio, video and data tapes)

• Investigation and analysis of magnetic data carriers (Hard Disks, Floppy Disks, many more)

• Analysis of magnetic ink and magnetic security seals/stamps

• Surface near crack and micro crack structure investigations

• Visualization of obliterated serial numbers on steel

• Surface near welding seem inspection

• Magnetic domain analysis and research