Acquisition and testing of latent fingerprints using upconversio

Details Acquisition and testing of latent fingerprints using upconversio Acquisition and testing of latent fingerprints using upconversio

1990-12-07

1992-03-24

Fields, Carolyn E.

Radiant energy

Luminophor irradiation

2504591, G01J 158

Patent

active

050991310

ABSTRACT:
Latent fingerprints are detected by upconverting infrared radiation provided by a special dusting powder and digitally imaging the upconverted radiation. In accordance with the principles of the present invention, a real time image of latent fingerprints is obtained by first "dusting" the print with a powdered upconversion material. The print is then illuminated with 1.55 .mu.m infrared radiation using a fiber optic bundle in the form of a probe. The 1.55 .mu.m infrared radiation is converted into several reradiated wavelength bands by the powdered upconversion material. A charge coupled device or diode matrix detector array converts the image of the fingerprint to digital format for real time display and/or transmission over airwaves. The system is a portable latent fingerprint acquisition system that permits rapid fingerprint evaluation and comparison. A method of detecting fingerprints is also disclosed.

REFERENCES:
patent: 4794260 (1988-12-01), Asano et al.
patent: 4956558 (1990-09-01), Batishko et al.
patent: 4983846 (1991-01-01), Rios et al.

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