Photo detection system

Details Photo detection system Photo detection system

1982-04-26

1984-11-27

Howell, Janice A.

Radiant energy

Luminophor irradiation

With ultraviolet source

378 44, G01N 2164

Patent

active

044853084

ABSTRACT:
A photo detection system is described utilizing an x-ray source to produce light emission on one or more phosphor materials being used to mark or tag various objects. More particularly, x-ray excitable phosphors are contained in a suitable medium such as marking ink to produce visible emission when irradiated by said x-ray source so that optical detection means positioned adjacent the x-ray source provide a response when objects marked with said phosphors are subjected to such inspection. In the preferred embodiments, an improved postal detection system is provided wherein the postal stamps are marked with at least one x-ray excitable phosphor and said photo detection system can further include a plurality of detection stations along with multiple optical photo detection means at a single station and even a supplemental source of ultraviolet radiation to excite one or more of said phosphors.

REFERENCES:
patent: 3305089 (1967-02-01), Fraenkel
patent: 3617743 (1971-11-01), Rabatin
patent: 3662181 (1972-05-01), Hercher et al.
patent: 3795814 (1974-03-01), Rabatin
patent: 3881941 (1975-05-01), Kernohan
patent: 3995157 (1975-05-01), Holub et al.
patent: 4015131 (1977-03-01), McDonough et al.
patent: 4136778 (1979-01-01), Wortman et al.
patent: 4160902 (1979-07-01), van Wijngaarden

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