Ns-scaled time-gated fluorescence lifetime imaging for forensic document examination

Xin Zhong; Xinwei Wang; Yan Zhou

doi:10.1117/12.2286229

10 January 2018 Ns-scaled time-gated fluorescence lifetime imaging for forensic document examination

Xin Zhong, Xinwei Wang, Yan Zhou

Proceedings Volume 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 106160R (2018) https://doi.org/10.1117/12.2286229
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

A method of ns-scaled time-gated fluorescence lifetime imaging (TFLI) is proposed to distinguish different fluorescent substances in forensic document examination. Compared with Video Spectral Comparator (VSC) which can examine fluorescence intensity images only, TFLI can detect questioned documents like falsification or alteration. TFLI system can enhance weak signal by accumulation method. The two fluorescence intensity images of the interval delay time tg are acquired by ICCD and fitted into fluorescence lifetime image. The lifetimes of fluorescence substances are represented by different colors, which make it easy to detect the fluorescent substances and the sequence of handwritings. It proves that TFLI is a powerful tool for forensic document examination. Furthermore, the advantages of TFLI system are ns-scaled precision preservation and powerful capture capability.

Citation Download Citation

Xin Zhong, Xinwei Wang, and Yan Zhou "Ns-scaled time-gated fluorescence lifetime imaging for forensic document examination", Proc. SPIE 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 106160R (10 January 2018); https://doi.org/10.1117/12.2286229

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