| 摘要 |
An authentication system for authenticating an article with a taggent thereon is disclosed (9), in which the taggent has a predetermined light resonance absorption spectrum. The system comprises a laser device (1) for providing a source of light at a plurality of predetermined wavelengths which correspond to particular wavelengths within the absorption spectrum of the taggent. The light from the laser device is passed through or is reflected from the taggent and a detector (13) detects the light at the predetermined wavelengths and produces an output in response thereto. A microprocessor (17) is coupled to the detector device for receiving the output of the detector, comparing the detected light with preset values at the predetermined wavelengths, and generating one of a plurality of determined output messages (19) to indicate whether or not positive authentication has occured. The laser device can be a plurality of lasers (1a, b) each emitting light at a different predetermined wavelenght, or a tunable laser which is tuned in the range of the absorption spectrum of the taggent in the label. |
