Method and apparatus for detecting inks

Details Method and apparatus for detecting inks Method and apparatus for detecting inks

1988-10-26

1990-06-19

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 250351, G01N 2135

Patent

active

049356283

ABSTRACT:
Apparatus for detecting the presence of an ink on a substrate comprises a number of LEDs (1) for irradiating the substrate (2) with radiation at at least two different wavelengths, at least one of the wavelengths being chosen to correspond to an absorption or relectance wavelength of the ink to be detected. A sequence generator (5) modulates the radiation at each wavelength in a respective, different manner. A radiation sensor (3) senses radiation emitted by the substrate (2). A correlator (7,8) correlates samples of the sensed radiation from the radiation sensor (3) with signals each of which is modulated by a respective one of the modulations applied to the radiation, to generate correlation signals. A monitor (9) monitors the correlation signals in order to detect the presence of the said ink.

REFERENCES:
patent: 3650400 (1972-03-01), Warren et al.
patent: 3933094 (1976-01-01), Murphy et al.
patent: 3971951 (1976-07-01), Rikukawa et al.

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