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United States Patent | 5,757,001 |
Burns | May 26, 1998 |
A method of detecting counterfeit currency by contacting the currency to be tested with near infrared beams in the spectrum below 1250 namometers, measuring reflectance of the near infrared beams and comparing the reflectance values with those from genuine currency.
Inventors: | Burns; Donald A. (Los Alamos, NM) |
Assignee: |
The Regents of the University of Calif.
(Oakland,
CA)
|
Appl. No.: | 08/641,657 |
Filed: | May 1, 1996 |
Current U.S. Class: | 250/339.11 ; 250/339.09; 250/341.8 |
Current International Class: | G07D 7/12 (20060101); G07D 7/00 (20060101); G07D 7/20 (20060101); G01N 21/31 (20060101); G01N 21/35 (20060101); G01N 021/55 () |
Field of Search: | 250/339.11,339.09,341.8 |
3867041 | February 1975 | Brown et al. |
5483069 | January 1996 | Kofune et al. |
52-60200 | May., 1977 | JP | |||
Technology Detects Fake Money, Stones, Newspaper Journal Journal North, May 12, 1995. . "Tool Could Nab Counterfeiters," The FLC News Link, Jun., 1995. . "Spectroscopy Foils Money Counterfeiters," Photonics Spectra, Jun. 1995, p. 29. . "Laboratory Technology Could Curtail Counterfeiters," Newsbulletin, May 5, 1995, pp. 1+. . "Counterfeit Currency Is No Match for Los Alamos Technology," Dateline Los Alamos, Oct. 1995, pp. 1+. . "Finding the Fake," Modern Maturity, Sep.-Oct., 1995. . "The Supernote," The New Yorker, Oct. 23, 1995, pp. 50-55. . "Fake $100 Bills Worry U.S. Officials," The Cincinnati Enquirer, Oct. 16, 1995, p. A1. . "Principal Component Analysis of Diffuse Near-Infrared Reflectance Data from Paper Currency," Applied Spectroscopy 43,8 (1989) pp. 1399-1405.. |