Radiant energy – Luminophor irradiation
Patent
1987-02-10
1988-12-27
Howell, Janice A.
Radiant energy
Luminophor irradiation
356 71, F21V 916, G01J 158
Patent
active
047942606
ABSTRACT:
In one aspect of the invention, the sample surface is wetted with an aqueous solution of a fluorescent dye followed by rinses with water to remove an excessive amount of the dye so that the background fluorescence emission can be minimized to increase the efficiency of fingerprint detection. In another aspect, the fluorescent dye or a reagent to produce fluorescent substance is deposited on the sample surface by attaching a gelatinous film impregnated with a solution thereof followed by peeling. In a further different aspect, a powdery fluorescent dye is deposited on to the sample surface followed by spraying of water to wash away an excessive amount of the powdery dye so that the background fluorescence can be minimized. The invention also provides an apparatus for the fingerprint detection by the laser beam excitation of fluorescence, which is compact and portable as being composed of an ingenious combination of several units into an integral system.
REFERENCES:
patent: 4011174 (1977-03-01), Molina
patent: 4176205 (1979-11-01), Molina
patent: 4500204 (1985-02-01), Ogura
Asano Yuichiro
Kono Yoshihisa
Momose Atsushi
Moriya Susumu
Torao Akiro
Howell Janice A.
Kawasaki Steel Corporation
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