ILLUMINATION SOURCES AND SUBJECTS HAVING DISTINCTLY MATCHED AND MISMATCHED NARROW SPECTRAL BANDS

A light source is configured to emit a narrow peak at a discrete spectral band, especially at a primary color wavelength. The light source can have a plurality of narrow peaks to simulate the effect of a broadband light source. A subject is provided with a pigment, such as certain rare earth lanthan...

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Bibliographische Detailangaben
Hauptverfasser:	STOVOLD, Terry, BELL, Edward, H, GARDNER, Norman, A
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHECKING-DEVICES CINEMATOGRAPHY ELECTROGRAPHY ELECTROPHOTOGRAPHY HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING HOLOGRAPHY MAGNETOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	A light source is configured to emit a narrow peak at a discrete spectral band, especially at a primary color wavelength. The light source can have a plurality of narrow peaks to simulate the effect of a broadband light source. A subject is provided with a pigment, such as certain rare earth lanthanides, with a strong absorption peak at a corresponding narrow spectral band. The pigment has a nominal color when illuminated by a true broadband light (e.g., sunlight) that does not have a narrow peak at the discrete spectral band, and has a different color when illuminated by the light source that has a narrow peak. This color shift can be used for security authentication, information and decorative applications.