Detection apparatus and method
US8395122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2011 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | Nov 16, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M3/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for detection of infrared radiation emitted from a taggant following excitation of the taggant sample measures the decay time of the radiation used. If the decay characteristic is accurately measured, the particular taggant can be accurately identified. The apparatus comprises an electronic controller, light-emitting diodes, a photo-detector, a first amplifier, a three-way sampling switch, filter/stores, second amplifiers and an output display. The infrared emission is excited by repeatedly illuminating the taggant for a period of microseconds every few milliseconds. When the light source is turned off, the sample continues radiating for a few milliseconds. The emission is detected by photo-detector sensitive to the 800 to 1000 nm waveband thereby rejecting interference from visible light sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.