US 9,753,114 B2Granted

Gap and displacement magnetic sensor system for scanner heads in paper machines or other systems

AssigneeHoneywell Inc.

InventorRonald E. Beselt

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Abstract

A gap and displacement magnetic sensor system for scanner heads in paper machines or other systems includes a multiple-sensor assembly. The multiple-sensor assembly includes multiple magnetic field orientation sensors configured to capture measurements of a magnetic field in order to identify (i) a displacement of first and second scanning sensor heads in a first direction, and (ii) a gap separation of the first and second scanning sensor heads in a second direction, and (iii) a displacement of the first and second scanning sensor heads in a third direction. At least one of the magnetic field orientation sensors is disposed offset from a centerline of the magnetic field such that an output from the at least one magnetic field orientation sensor indicates a combination of the gap separation and the displacement in either the first direction or the third direction.

Claims20

Dependent claims

A method comprising:

generating a magnetic field;
capturing, by multiple magnetic field orientation sensors, measurements of the magnetic field by:
measuring, by a first magnetic field orientation sensor, a field angle of the magnetic field in a first direction with reference to a reference field angle, wherein the first magnetic field orientation sensor is disposed substantially in alignment with a centerline of the magnetic field;
and
measuring, by a second magnetic field orientation sensor, a field angle of the magnetic field in a plane defined by the first direction and a second direction, the first and second directions orthogonal to each other, wherein the second magnetic field orientation sensor is disposed offset from the centerline of the magnetic field such that an output from the second magnetic field orientation sensor represents a combination of (i) a displacement of first and second scanning sensor heads in the first direction and (ii) a gap separation of the first and second scanning sensor heads in the second direction;
and
identifying, using the measurements of the magnetic field, (i) the displacement of the first and second scanning sensor heads in the first direction and (ii) the gap separation of the first and second scanning sensor heads in the second direction.

4 more elements

A method comprising:

generating a magnetic field;
capturing, by multiple magnetic field orientation sensors, measurements of the magnetic field;
and
identifying, using the measurements of the magnetic field, (i) a displacement of first and second scanning sensor heads in a first direction and (ii) a gap separation of the first and second scanning sensor heads in a second direction;
wherein:
at least one of the magnetic field orientation sensors is disposed offset from a centerline of the magnetic field such that an output from the at least one magnetic field orientation sensor represents a combination of the displacement and the gap separation;
each of the magnetic field orientation sensors is calibrated to operate within a calibration range in which a voltage output from the magnetic field orientation sensor is related to a field angle measurement of the magnetic field;
within the calibration range, the field angle measurement of the magnetic field accurately represents a linear distance from an alignment reference point;
at limit points of the calibration range, (i) a minimum field angle measurement accurately represents a first linear distance from the alignment reference point and (ii) a maximum field angle measurement accurately represents a second linear distance from the alignment reference point in an opposite direction;
and
a tolerance corresponding to a specified nominal target gap separation is disposed between the limit points of the calibration range.

8 more elements

A multiple-sensor assembly comprising:

multiple magnetic field orientation sensors configured to capture measurements of a magnetic field in order to identify (i) a displacement of first and second scanning sensor heads in a first direction and (ii) a gap separation of the first and second scanning sensor heads in a second direction, the magnetic field orientation sensors comprising:
a first magnetic field orientation sensor configured to measure a field angle of the magnetic field in the first direction with reference to a reference field angle, wherein the first magnetic field orientation sensor is disposed substantially in alignment with a centerline of the magnetic field;
and
a second magnetic field orientation sensor configured to measure a field angle of the magnetic field in a plane defined by the first and second directions, the first and second directions orthogonal to each other, wherein the second magnetic field orientation sensor is disposed offset from the centerline of the magnetic field such that an output from the second magnetic field orientation sensor represents a combination of the displacement and the gap separation.

1 more element

A multiple-sensor assembly comprising:

multiple magnetic field orientation sensors configured to capture measurements of a magnetic field in order to identify (i) a displacement of first and second scanning sensor heads in a first direction and (ii) a gap separation of the first and second scanning sensor heads in a second direction;
wherein:
at least one of the magnetic field orientation sensors is disposed offset from a centerline of the magnetic field such that an output from the at least one magnetic field orientation sensor represents a combination of the displacement and the gap separation;
each of the magnetic field orientation sensors is calibrated to operate within a calibration range in which a voltage output from the magnetic field orientation sensor is related to a field angle measurement of the magnetic field;
within the calibration range, the field angle measurement of the magnetic field accurately represents a linear distance from an alignment reference point;
at limit points of the calibration range, (i) a minimum field angle measurement accurately represents a first linear distance from the alignment reference point and (ii) a maximum field angle measurement accurately represents a second linear distance from the alignment reference point in an opposite direction;
and
a tolerance corresponding to a specified nominal target gap separation is disposed between the limit points of the calibration range.

5 more elements

A system comprising:

first and second scanning sensor heads each configured to move across a surface of a web of material and capture measurements associated with the web, wherein:
the first scanning sensor head includes a magnet configured to generate a magnetic field;
and
the second scanning sensor head includes multiple magnetic field orientation sensors configured to capture measurements of the magnetic field in order to identify (i) a displacement of the first and second scanning sensor heads in a first direction and (ii) a gap separation of the first and second scanning sensor heads in a second direction, the magnetic field orientation sensors comprising:
a first magnetic field orientation sensor configured to measure a field angle of the magnetic field in the first direction with reference to a reference field angle, wherein the first magnetic field orientation sensor is disposed substantially in alignment with a centerline of the magnetic field;
and
a second magnetic field orientation sensor configured to measure a field angle of the magnetic field in a plane defined by the first and second directions, the first and second directions orthogonal to each other, wherein the second magnetic field orientation sensor is disposed offset from the centerline of the magnetic field such that an output from the second magnetic field orientation sensor represents a combination of the displacement and the gap separation.

4 more elements

A system comprising:

first and second scanning sensor heads each configured to move across a surface of a web of material and capture measurements associated with the web;
wherein:
the first scanning sensor head includes a magnet configured to generate a magnetic field;
the second scanning sensor head includes multiple magnetic field orientation sensors configured to capture measurements of the magnetic field in order to identify (i) a displacement of the first and second scanning sensor heads in a first direction and (ii) a gap separation of the first and second scanning sensor heads in a second direction;
at least one of the magnetic field orientation sensors is disposed offset from a centerline of the magnetic field such that an output from the at least one magnetic field orientation sensor represents a combination of the displacement and the gap separation;
each of the magnetic field orientation sensors is calibrated to operate within a calibration range in which a voltage output from the magnetic field orientation sensor is related to a field angle measurement of the magnetic field;
within the calibration range, the field angle measurement of the magnetic field accurately represents a linear distance from an alignment reference point;
at limit points of the calibration range, (i) a minimum field angle measurement accurately represents a first linear distance from the alignment reference point and (ii) a maximum field angle measurement accurately represents a second linear distance from the alignment reference point in an opposite direction;
and
a tolerance corresponding to a specified nominal target gap separation is disposed between the limit points of the calibration range.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/579,978Filed 22 Dec 2014 · us provisional application
Priority: 3 Nov 2014
Published: US 2016/0123773 A15 May 2016
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G01R 35/005
Testing or calibrating of apparatus covered by the other groups of this subclass: calibrating; Standards or reference devices, e.g. voltage or…
D21G 9/0009
Other accessories for paper-making machines: paper-making control systems
G01B 7/003
Measuring arrangements characterised by the use of electric or magnetic techniques: for measuring position, not involving coordinate determination
G01B 7/14
Measuring arrangements characterised by the use of electric or magnetic techniques: for measuring distance or clearance between spaced objects or…

Family

Application62/074,186Us provisional application · filed 3 Nov 2014
US 2016/0123773 A1Pre-grant publication · published 5 May 2016
US 9,753,114 B2This patent

From the US filing history. Foreign family members aren’t listed.

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