Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1978-03-06
1979-03-27
Dixon, Harold A.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250372, 250483, G01J 142, G01J 158
Patent
active
041467922
ABSTRACT:
The paper carries, at one or more points, materials which, in the excited condition, fluoresce in the visible, ultraviolet, or infra-red spectral range in the characteristic emission spectra. The device includes a light source for exciting fluorescent substances, a condenser lens concentrating the light emitted by the paper, a narrow band interference filter, a focusing lens, and a series of photocells arranged in the focal plane of the focusing lens. The geometric arrangement of the photocells is chosen appropriately to identify an emission-line doublet. The outputs of the photocells are fed to a pre-amplifier and then to a comparator which may effect a subtraction of the amplified photocell output to provide an output signal. In a variation, the quotient of the photocurrents of two photocells is compared to establish the authenticity of the paper.
REFERENCES:
patent: 2255696 (1941-09-01), Clifford
patent: 2262492 (1941-11-01), Farrell
patent: 2538784 (1951-01-01), Kantrowitz
patent: 3473027 (1969-10-01), Freeman
patent: 3663813 (1972-05-01), Shaw
Fluorescent and Other Gaseous Discharge Lamps by Forsythe & Adams, 1949, pp. 47-50.
Lehle Erhard
Stenzel Gerhard
Dixon Harold A.
G.A.O. Gesellschaft fur Automation und Organisation mbH
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