Fluorescent object recognition system having self-modulated ligh

Details Fluorescent object recognition system having self-modulated ligh Fluorescent object recognition system having self-modulated ligh

1984-09-14

1987-02-10

Dixon, Harold

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

250271, 250504R, 2504611, 315283, H05B 3700

Patent

active

046425268

ABSTRACT:
An object recognition system for detecting visible light of a predetermined wavelength emitted by a fluorescent material illuminated with modulated ultraviolet light produced by a self-modulated high pressure mercury vapor lamp. The lamp forms part of a resonant LC circuit which produces oscillations in the lamp intensity at a frequency higher than line frequency. The resulting visible light is detected, demodulated, and compared with a predetermined threshold to sense when the fluorescent material is present. Self-modulation of the UV lamp source eliminates external triggering, excitation or switching of the lamp power supply.

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