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4 February 1999 Magnetic scanner for forensic examination of audiotapes
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Proceedings Volume 3576, Investigation and Forensic Science Technologies; (1999) https://doi.org/10.1117/12.334525
Event: Enabling Technologies for Law Enforcement and Security, 1998, Boston, MA, United States
Abstract
The use of a new Magnetic Media Imaging Instrument (MMII) as applied to the forensic investigation of audio tapes is reported. The MMII is an instrument that produces a 2D image of the magnetic fields on a segment of tape up to 5 cm long, with a resolution of about 3 microns. The dynamic range exceeds 40 dB. This allows the visualization of important characteristics such as stop marks with much greater detail than is possible with conventional means such as ferrofluids. Results of tests representing typical forensic examinations are presented.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael E. Read, Willi G. Schwarz, Lex Malsawma, Robert B. Wallace, and James J. Ryan "Magnetic scanner for forensic examination of audiotapes", Proc. SPIE 3576, Investigation and Forensic Science Technologies, (4 February 1999); https://doi.org/10.1117/12.334525
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