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Matesy Magneto-Optic Systems and Sensors,
MagView, CMOS-MagView, MagEye

Magneto-Optic Sensors enable visualization of the vertical magnetic field from a flat surface with down to 1µm spatial resolution and 1µs time resolution.

Applications: hard and soft magnetic material analysis, permanent magnet magnetization, magnetic stripe cards, encoders, audio and video tapes, serial numbers, welding seams, magnetic ink, bank notes, magnetic data carriers, magnetic domains.

Magneto-Optic Sensors

Stand-alone sensors for integration into your own system.

Sensor Type A B C D
Field Range ±2.5mT (±2kA/m) ±39mT (±31kA/m) ±160mT (±100kA/m) ±6mT (±5kA/m)
Sensor Sizes 8x8mm,
3inch dia. or
3inch dia. or
3inch dia. or
8x8mm or
Application Magnetic stripe cards, hard magnetic ink, steels, audio tapes magnetic stripe cards, polymer bound magnets, audio tapes magnetic encoders, grain structures and stray field distributions of permanent magnets and polymer bound magnets magnetic bias-fields of magnetic ink (e.g. documents, banknotes) and steels (e.g. car serial numbers)

More information on Magneto-Optic Sensors available from Matesy's Website.

Sensor Kit

Sensor Kits
Packaged kit designed for Forensic Analysis of damaged serial numbers

MOS-KIT-3A – Type A ( ±2kA/m) Sensor Kit containing

  • Type A Sensor 3x3mm
  • Type A Sensor 3x15mm
  • Type A Sensor 15x17mm
  • Permanent Magnet for magnetization of sample area
  • Plastic Tweezers for safe handling of sensors

Kit does not contain a polarized light source or camera.

For more information on using Magneto-Optic Films for Forensic Analysis, see:


Magneto-Optic Systems


MagView is a magneto-optical readout device for fast and precise visualization of magnetic field structures. The handheld device can be applied for qualitative testings and stray field analyses. MagView visualizes magnetic stray fields of credit cards, magnetic encoders and multipole magnets.

  • Direct visualization of magnetic fields
  • Field range: ±2.5mT, ±39mT, ±160mT or ±6mT
  • Sensor size: up to D = 25 mm
  • Portable and easy handling

More information on MagView available from Matesy's Website.


The “Magnetic Field Camera” System CMOS-MagView is a high resolution magnetic measurement and visualization system. It allows magnetic field mapping under the stimulation of leakage flux / stray field.

  • Field range: ±2.5mT, ±39mT, ±160mT or ±6mT
  • Sensor size: 20.5x15.5mm or 60x45mm
  • Optical Resolution:25 μm with 20.5 x 15.5mm sensor
    25 μm with 20.5 x 15.5mm sensor

More information on CMOS-Magview available from Matesy's Website.


The MiniMO is a low resoltuion, compact “Magnetic Field Camera” magnetic measurement and visualization system. It allows magnetic field mapping under the stimulation of leakage flux / stray field.

  • Field range: ±2.5mT, ±39mT, ±160mT or ±6mT
  • Sensor size: 15mm x 7mm or 60x45mm
  • Optical Resolution: 50 μm
  • Image Resolution: 950 x 450 pixels

More information on CMOS-Magview available from Matesy's Website.


With the MagEye the magneto-optical analysis becomes easier than ever before. The system enables nondestructive realtime investigation of magnetic stray fields with simultaneous evaluation. Conveniently – with a simple hand movement.

  • FIeld range: ±2mT
  • Sensor size: 8 x 8 mm
  • Optical resolution: ~10μm

More information on MagEye available from Matesy's Website.


Operating Principle
The magneto-optic principle is based on the Faraday effect. It describes the rotation of the plarizaton plane of linearly polarized light when passing through a transparent medium. When light passes through a magneto-optical medium, the different angles of rotation of the polarization depends on the local magnetic field strength, resulting in contrast-differences which can be visually evaluated. Thus, a direct, real-time visualization of a quasi-static magnetic field over the entire sensor surface is achieved.

More information on all applications available on Matesy's website.

Quality Control of Permanent Magnets

Visualization of Rotary Encoder and Plot of Bz vs. Angle
(recorded with CMOS-MagView)

Visualization of Ring Magnet
(recorded with CMOS-MagView)

Quality Control of Magnetic Stripe Cards and Data/Audio Tapes

Visualization of credit card stripe with damage to magnetization

Visualization of Magnetic Tape

Reconstructon of obliterated serial numbers

Recovered serial number, recorded with cmos-magview

Welding seam inspection

Welding Seam
Magnetic Ink and Bank Note Visualization

Security Features of US $10 Bank Note

Magnetic Ink on Check
Domain Structure Visualization
Magnetic Units

Conversion of Gauss to Tesla:
1µG = 0.1nT, 1mG = 100nT, 1G = 100µT, 10G = 1mT, 10,000G = 1T

Relationship between Magnetic Flux Density (B) and Magnetic Field Strength (H):
In vacuum (or air) B=µoH. For SI units µo = 4pi x 10-7H/m, B is expressed in Tesla and H in Ampere turn/m or A/m. Hence in vacuum or air a flux density of 1T = 796kA/m.
For cgs units µo = 1, B is expressed in gauss and H in oersted. Hence in vacuum or air a flux density of 1 gauss = 1 oersted.
For further information visit the NIST Reference on Constants, Units, and Uncertainty


Last updated on: 3 November, 2016

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