Forensic analysis of magnetic tape technology


moses II is a magneto-optical readout system for forensic investigations. It enables a quick and reliable visualization of the magnetic tape information. Based on the modular design MOSES II supports the investigation of all types of commercially available tapes.


Magneto-optical forensic visualization

Magnetic fields can be found on all magnetic information carriers such as credit cards and audio- & video tapes. This magnetic information unfortunately can be easily copied and manipulated.


moses - Untersuchung von Magnetbändern
moses - Untersuchung von Magnetbändern


However, there always remains manipulation traces which can be visualized moses II. These traces for instance occur due to the mismatch or the tilting of the audio head, that produces the traces while writing. Another reason for traces are typical touchdown and lift off marks of the audio head.


moses 2 Functional Principle

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 digital camera on request

moses 2 Technical Features

Technical Features

  • Direct visualization of magnetic information
  • Monochromatic LED light source
  • Highly sensitive magneto-optical sensor (at least 17 x 8 mm)
  • Manually adjustable analyzer
  • Optional high resolution color CCD camera with zoom lens
  • Software for camera control and image processing
  • Audio output connector & integrated speakers
  • Modules for compact- and micro-cassettes as well as for video tapes



Back to Overview    Applications






Contact Information Marketing & Sales Matesy GmbH: 

Tel: +49 (0) 3641 79799 00  |  Fax:+49 (0) 3641 79799 01  E-mail: info[at]matesy[dot]de  |  Web: