Gap and Displacement Magnetic Sensor System for Scanner Heads

Abstract

A gap and displacement magnetic sensor system for a scanner head in a paper machine or other system includes a multi-sensor assembly (414b). The multi-sensor assembly includes a plurality of magnetic field orientation sensors (514x-514z) configured to capture measurements of magnetic fields (550-552) to identify (i) a first scan sensor head and a second scan sensor head The displacement in the first direction (X direction) and (ii) the gap spacing of the first scan sensor head (410a) and the second scan sensor head (410b) in the second direction (Z direction), and (iii) the The displacement of the first scanning sensor head and the second scanning sensor head in the third direction (Y direction). At least one of the magnetic field orientation sensors (514z) is arranged offset from the centerline (552) of the magnetic field such that the output from the at least one magnetic field orientation sensor indicates a combination of gap spacing and displacement in the first or third direction.

Description

[0001] CROSS-REFERENCE AND PRIORITY TO RELATED APPLICATIONS [0002] This application claims benefit under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application Serial No. 62 / 074,186, filed November 3, 2014, entitled "GAPAND DISPLACEMENT MAGNETIC SENSOR SYSTEM FOR SCANNER HEADS IN PAPER MACHINESOR OTHER SYSTEMS" The priority of the subject. The contents of the patent documents identified above are incorporated herein by reference. technical field [0003] The present disclosure generally relates to scanning systems. More specifically, the present disclosure relates to gap and displacement magnetic sensor systems for scanner heads in paper machine or other systems. Background technique [0004] Sheets or other webs of material are used in a variety of industries and in a variety of ways. These materials may include paper, ply board and other products manufactured or processed in long webs. As a specific example, long sheets of paper may be manufactured and collected i...

AI Technical Summary

Problems solved by technology

Potential interference from ribbons typically limits the sensor technologies that can be used to measure Z-gap distance to magnetic, capacitive, or inductive sensing types, since opaque ribbon material often blocks optical sensors

While relatively low-cost magnetic field orientation sensors exist to allow precise displacement sensing for the X and Y directions, absolute Z-gap measurements have traditionally been limited to the use of expensive inductive coil technology

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