1. Passport examination by a confocal-type laser profile microscope
Shigeru Sugawara 
Forensic Science International 
Volume 178, Issue 1, Pages (June 2008)
DOI: /j.forsciint
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

2. Fig. 1 Ray diagram of confocal-type laser profile microscope.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

3. Fig. 2
Signal intensity as a function of stage vertical position measured using the spot measurement function of the microscope. The right and left peaks correspond to the film surface and film–paper interface, respectively.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

4. Fig. 3
Surface and interface profiles measured using the line profile measurement function of the microscope. The upper line is the profile of the film surface and the lower one is the profile of the film–paper interface.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

5. Fig. 4 Outline of the algorithm for thickness calculation.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

6. Fig. 5
Relation between linear lines fitted to the profiles and film thickness. T is the thickness of the film, l is the scanning length of the line profile measurement.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

7. Fig. 6 Arrangement of weights for the proposed method.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

8. Fig. 7 Measurement points.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

9. Fig. 8
Intra-sample standard deviations of thickness measurements of films of machine-readable genuine passports.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

10. Fig. 9
Intra-sample standard deviations of thickness measurements of films of counterfeit passports.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

11. Fig. 10
Distribution of the intra-sample average of film thicknesses of machine-readable genuine passports.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

12. Fig. 11
Distribution of the intra-sample average of the thickness of polyethylene terephthalate (PET) films. Black represents genuine machine-readable passports; gray, genuine non-machine-readable passports; and white, counterfeit passports.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

13. Fig. 12
Distribution of the intra-sample average of the thickness of polyvinyl chloride (PVC) films.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

14. Fig. 13
Distribution of the intra-sample average of the thickness of polypropylene (PP) films.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

15. Fig. 14
Distribution of the intra-sample average of the thickness of polymethyl methacrylate (PMMA) films.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions

16. Fig. 15
Distribution of the intra-sample average of the film thicknesses of name cards.
Forensic Science International  , 40-45DOI: ( /j.forsciint )
Copyright © 2008 Elsevier Ireland Ltd Terms and Conditions