Instrumentation, Techniques, and Measurement

Wide-field time-resolved luminescence imaging and spectroscopy to decipher obliterated documents in forensic science

[+] Author Affiliations
Mototsugu Suzuki

Criminal Investigation Laboratory, Metropolitan Police Department, 2-1-1, Kasumigaseki, Chiyoda-ku, Tokyo 100-8929, Japan

Norimitsu Akiba, Kenji Kurosawa, Kenro Kuroki, Yoshinori Akao, Yoshiyasu Higashikawa

National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa-shi, Chiba 277-0882, Japan

Opt. Eng. 55(1), 014101 (Jan 13, 2016). doi:10.1117/1.OE.55.1.014101
History: Received October 28, 2015; Accepted December 3, 2015
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Abstract.  We applied a wide-field time-resolved luminescence (TRL) method with a pulsed laser and a gated intensified charge coupled device (ICCD) for deciphering obliterated documents for use in forensic science. The TRL method can nondestructively measure the dynamics of luminescence, including fluorescence and phosphorescence lifetimes, which prove to be useful parameters for image detection. First, we measured the TRL spectra of four brands of black porous-tip pen inks on paper to estimate their luminescence lifetimes. Next, we acquired the TRL images of 12 obliterated documents at various delay times and gate times of the ICCD. The obliterated contents were revealed in the TRL images because of the difference in the luminescence lifetimes of the inks. This method requires no pretreatment, is nondestructive, and has the advantage of wide-field imaging, which makes it is easy to control the gate timing. This demonstration proves that TRL imaging and spectroscopy are powerful tools for forensic document examination.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Mototsugu Suzuki ; Norimitsu Akiba ; Kenji Kurosawa ; Kenro Kuroki ; Yoshinori Akao, et al.
"Wide-field time-resolved luminescence imaging and spectroscopy to decipher obliterated documents in forensic science", Opt. Eng. 55(1), 014101 (Jan 13, 2016). ; http://dx.doi.org/10.1117/1.OE.55.1.014101


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