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Schematic overview of a Timegated Raman spectrometer. 

Schematic overview of a Timegated Raman spectrometer. 

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Figure 1. Schematic overview of a Timegated Raman spectrometer. 
Table 1 . How common it is to imitate security features in counterfeit...
Figure 2. Picture of the measurement with probe and a counterfeit e200...
Figure 3. Spectra of the e50 Z-series banknote showing a) a raw...
+4 Figure 4. a) Raman spectrum of a genuine e50 banknote and that of a...
Separating counterfeit and genuine euro banknotes using time-resolved Raman spectroscopy
Article
Full-text available
  • Nov 2015
A time-resolved Raman spectral method is used for distinguishing counterfeit banknotes from the genuine samples. The blue color pigment of the European flag was found to be a good separating factor for the genuine and counterfeit banknotes. We show that, in spite of the strong fluorescing effect of the European flag, especially in the old banknotes...
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... major challenge in using Raman spectroscopy is the frequent presence of intense photoluminescence such as fluorescence. Since Raman scattering is typically instantaneous compared to fluorescence, a time-resolved measurement with a pulsed excitation has proved to be an effective fluorescence-rejection method. TimeGate Instruments has released a novel setup for Timegated Raman spectrometer (see schematic figure 1). Here we demonstrate its ability to measure a fluorescence-suppressed Raman signal from the euroflag region of euro banknotes, and show that there are also kind of hidden features, which can reliably separate counterfeit from genuine banknotes. An example of the probe for an e200 counterfeit is shown in Fig. ...

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Figure 1. Schematic overview of a Timegated Raman spectrometer. 
Table 1 . How common it is to imitate security features in counterfeit...
Figure 2. Picture of the measurement with probe and a counterfeit e 200...
Figure 3. Spectra of the e 50 Z-series banknote showing a) a raw...
+5 Figure 4. a) Raman spectrum of a genuine e 50 banknote and that of a...
Separating counterfeit and genuine euro banknotes using the time-resolved Raman spectroscopy
Research
Full-text available
  • Dec 2015
A time-resolved Raman spectral method is used for distinguishing counterfeit banknotes from the genuine samples. The blue color pigment of the European flag was found to be a good separating factor for the genuine and counterfeit banknotes. We show that, in spite of the strong fluorescing effect of the European flag, especially in the old banknotes...
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