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METHOD FOR TESTING OF BANK NOTES, ESPECIALLY DOLLAR BILLS, AND EQUIPMENT FOR THE IMPLEMENTATION OF THE METHOD
METHOD FOR TESTING OF BANK NOTES, ESPECIALLY DOLLAR BILLS, AND EQUIPMENT FOR THE IMPLEMENTATION OF THE METHOD
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机译:测试银行票据,特别是美元钞票的方法,以及实施该方法的设备
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摘要
A dollar bill (1) to be tested is illuminated by a pencil of rays (9) of ultraviolet light having an angle of 45°. A first part Ζ1 of the light reflected by the bill and having a wavelength μ 400 nm is detected in a photodetecting device (10). A second part Ζ2 of the light passing through the bill and having a wavelength μ = 340 nm, approximately, is detected in a photodetecting device (13), and a third part Ζ3 of the light emitted from the bill by the effect of fluorescence and having a wavelength in the range 426 μ 446 nm is detected in a photodetecting device (16). The three parts of light Ζ1, Ζ2, and Ζ3 are compared in an electric circuit to predetermined values referring to a genuine bill. If disagreement exists between at least one of the measured values and the predetermined values, a signal is emitted indicating that the bill is forged. The possible organic differences in the manufacturing material between a tested bill and a genuine bill may be proved with certainty, and thus whether the tested bill is genuine or forged.
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