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J. Bouten, M. Van Rijsbergen, and S. Donkers, "Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations," J. Audio Eng. Soc., vol. 55, no. 4, pp. 257-265, (2007 April.). doi: J. Bouten, M. Van Rijsbergen, and S. Donkers, "Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations," J. Audio Eng. Soc., vol. 55 Issue 4 pp. 257-265, (2007 April.). doi:
Abstract: One of the main questions forensic tape authenticity investigations seek to answer is whether a recording on a given tape was produced using a given recorder in a claimed way. A technique that uses so-called ferrimagnetic garnet films, also known as Faraday crystals, makes it possible to take pictures showing the magnetic flux distribution on a tape in such detail that it enables a forensic investigator to answer questions that may arise about the correctness of the claims made. For an in-depth understanding of pictures of these flux distributions, a theory behind the visualization technique is necessary. The derivation of a theoretical transfer function of the visualization technique (spanning from a theoretical input signal to the actual luminance of the pictures) is described and one of a few experiments that were conducted to prove its validity is presented.

@article{bouten2007derivation,
author={bouten, jos and van rijsbergen, mariska and donkers, simon},
journal={journal of the audio engineering society},
title={derivation of a transfer function for imaging polarimetry used in magneto-optical investigations of audio tapes in authenticity investigations},
year={2007},
volume={55},
number={4},
pages={257-265},
doi={},
month={april},} @article{bouten2007derivation,
author={bouten, jos and van rijsbergen, mariska and donkers, simon},
journal={journal of the audio engineering society},
title={derivation of a transfer function for imaging polarimetry used in magneto-optical investigations of audio tapes in authenticity investigations},
year={2007},
volume={55},
number={4},
pages={257-265},
doi={},
month={april},
abstract={one of the main questions forensic tape authenticity investigations seek to answer is whether a recording on a given tape was produced using a given recorder in a claimed way. a technique that uses so-called ferrimagnetic garnet films, also known as faraday crystals, makes it possible to take pictures showing the magnetic flux distribution on a tape in such detail that it enables a forensic investigator to answer questions that may arise about the correctness of the claims made. for an in-depth understanding of pictures of these flux distributions, a theory behind the visualization technique is necessary. the derivation of a theoretical transfer function of the visualization technique (spanning from a theoretical input signal to the actual luminance of the pictures) is described and one of a few experiments that were conducted to prove its validity is presented.},}

TY - paper
TI - Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations
SP - 257 EP - 265
AU - Bouten, Jos
AU - Van Rijsbergen, Mariska
AU - Donkers, Simon
PY - 2007
JO - Journal of the Audio Engineering Society
IS - 4
VO - 55
VL - 55
Y1 - April 2007 TY - paper
TI - Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations
SP - 257 EP - 265
AU - Bouten, Jos
AU - Van Rijsbergen, Mariska
AU - Donkers, Simon
PY - 2007
JO - Journal of the Audio Engineering Society
IS - 4
VO - 55
VL - 55
Y1 - April 2007
AB - One of the main questions forensic tape authenticity investigations seek to answer is whether a recording on a given tape was produced using a given recorder in a claimed way. A technique that uses so-called ferrimagnetic garnet films, also known as Faraday crystals, makes it possible to take pictures showing the magnetic flux distribution on a tape in such detail that it enables a forensic investigator to answer questions that may arise about the correctness of the claims made. For an in-depth understanding of pictures of these flux distributions, a theory behind the visualization technique is necessary. The derivation of a theoretical transfer function of the visualization technique (spanning from a theoretical input signal to the actual luminance of the pictures) is described and one of a few experiments that were conducted to prove its validity is presented.