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Proceedings Paper

Magnetic scanner for forensic examination of audiotapes
Author(s): Michael E. Read; Willi G. Schwarz; Lex Malsawma; Robert B. Wallace; James J. Ryan
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Paper 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.

Paper Details

Date Published: 4 February 1999
PDF: 10 pages
Proc. SPIE 3576, Investigation and Forensic Science Technologies, (4 February 1999); doi: 10.1117/12.334525
Show Author Affiliations
Michael E. Read, Physical Sciences, Inc. (United States)
Willi G. Schwarz, Physical Sciences, Inc. (United States)
Lex Malsawma, Physical Sciences, Inc. (United States)
Robert B. Wallace, Federal Bureau of Investigation (United States)
James J. Ryan, Federal Bureau of Investigation (United States)


Published in SPIE Proceedings Vol. 3576:
Investigation and Forensic Science Technologies
Kathleen Higgins, Editor(s)

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