Infrared detection of authenticity of security documents comprising electromagnetic particles
First Claim
1. A method of checking the authenticity of a security document, said method comprising the following steps:
- a) providing a document comprising a base material;
b) providing particles having some electromagnetic properties differing substantially from the corresponding electromagnetic properties of said base material to said document;
c) emitting near infrared or visible waves to said document;
d) detecting any of said emitted near infrared or visible waves reflected from said document;
e) processing said detected near infrared or visible waves in order to differentiate a security document comprising said particles in its volume from a non-security document comprising said particles on its surface.
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Accused Products
Abstract
An apparatus for checking the authenticity of a security document (28). The security document (28) comprises a base material and in its volume particles having some electromagnetic properties which are substantially different from the corresponding electromagnetic properties of the base material. The apparatus comprises at least one emitter (18) for emitting near infrared or visible waves to the document (28), at least one detector (20) for detecting any of the emitted near infrared or visible waves reflected from the document (28) and means (30) for processing the detected near infrared or visible waves in order to differentiate the security document (28) from a document comprising electromagnetic particles or parts on its surface.
106 Citations
17 Claims
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1. A method of checking the authenticity of a security document, said method comprising the following steps:
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a) providing a document comprising a base material; b) providing particles having some electromagnetic properties differing substantially from the corresponding electromagnetic properties of said base material to said document; c) emitting near infrared or visible waves to said document; d) detecting any of said emitted near infrared or visible waves reflected from said document; e) processing said detected near infrared or visible waves in order to differentiate a security document comprising said particles in its volume from a non-security document comprising said particles on its surface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of checking the type of a checkable article, said method comprising the following steps:
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providing a checkable article comprising a base material and particles having at least one electromagnetic property differing substantially from a corresponding electromagnetic property of said base material, said checkable article comprising one of a first article having said particles located within said base material and a second article having said particles located on a surface of said base material; directing electromagnetic waves having a wavelength within near infrared and visible wavelengths to said checkable article for reflection from said checkable article as reflected waves; detecting said reflected waves as detected waves; and processing said detected waves to determine whether said checkable article is said first article or said second article. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification