Differential fiber optic sensing method and apparatus for...

Details Differential fiber optic sensing method and apparatus for... Differential fiber optic sensing method and apparatus for...

G - Physics

01

D

88/97, 101/96.02

G01D 15/00 (2006.01) B41J 2/125 (2006.01)

Patent

CA 1131289

ABSTRACT OF THE DISCLOSURE Optical fibers are used to sense fluid ink drops along the x, y and z axis of an orthogonal coordi- nate system. A drop sensing zone is defined in the narrow space between the faces of a single input fiber and two output fibers. An LED infrared light source is coupled to a remote end of the input fiber. Infrared sensitive photodiodes are coupled to the remote ends of each output fiber. The photodiodes are in turn coupled to a differen- tial amplifier whose output represents a displacement error for the x and y axis and represents a time reference for the z axis for the case where the drop flight path is along the z axis. A plurality of sensors are disclosed in an ink recording system having a plurality of nozzles and in an ink recording system having an ink generator traversing the length of a high speed rotating drum.

343528

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