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Title: Fiber optic sensor system for detecting movement or position of a rotating wheel bearing

Abstract

An improved fiber optic sensor system and integrated sensor bearing assembly for detecting movement or position of a rotating wheel bearing having a multi-pole tone ring which produces an alternating magnetic field indicative of movement and position of the rotating member. A magneto-optical material, such as a bismuth garnet iron (B.I.G.) crystal, having discrete magnetic domains is positioned in the vicinity of the tone ring so that the domains align themselves to the magnetic field generated by the tone ring. A single fiber optic cable, preferably single mode fiber, carries light generated by a source of light to the B.I.G. crystal. The light passes through the B.I.G. crystal and is refracted at domain boundaries in the crystal. The intensity of the refracted light is indicative of the amount of alignment of the domains and therefore the strength of the magnetic field. The refracted light is carried by the fiber optic cable to an optic receiver where the intensity is measured and an electrical signal is generated and sent to a controller indicating the frequency of the changes in light intensity and therefore the rotational speed of the rotating wheel bearing.

Inventors:
 [1];  [2];  [1];  [3];  [4]
  1. (Los Alamos, NM)
  2. (Santa Fe, NM)
  3. (Ann Arbor, MI)
  4. (Ypsilanti, MI)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
870830
Patent Number(s):
US 5602946
Assignee:
NTN Technical Center (USA) (Ann Arbor, MI) LANL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
fiber; optic; sensor; detecting; movement; position; rotating; wheel; bearing; improved; integrated; assembly; multi-pole; tone; produces; alternating; magnetic; field; indicative; magneto-optical; material; bismuth; garnet; iron; crystal; discrete; domains; positioned; vicinity; align; generated; single; cable; preferably; mode; carries; light; source; passes; refracted; domain; boundaries; intensity; amount; alignment; strength; carried; receiver; measured; electrical; signal; controller; indicating; frequency; changes; rotational; speed; bearing assembly; mode fiber; light passes; rotational speed; electrical signal; fiber optic; magnetic field; single mode; light intensity; alternating magnetic; optic cable; light generated; field generated; optic sensor; rotating wheel; single fiber; wheel bearing; improved fiber; detecting movement; domain boundaries; /385/250/324/

Citation Formats

Veeser, Lynn R., Rodriguez, Patrick J., Forman, Peter R., Monahan, Russell E., and Adler, Jonathan M.. Fiber optic sensor system for detecting movement or position of a rotating wheel bearing. United States: N. p., 1997. Web.
Veeser, Lynn R., Rodriguez, Patrick J., Forman, Peter R., Monahan, Russell E., & Adler, Jonathan M.. Fiber optic sensor system for detecting movement or position of a rotating wheel bearing. United States.
Veeser, Lynn R., Rodriguez, Patrick J., Forman, Peter R., Monahan, Russell E., and Adler, Jonathan M.. Wed . "Fiber optic sensor system for detecting movement or position of a rotating wheel bearing". United States. doi:. https://www.osti.gov/servlets/purl/870830.
@article{osti_870830,
title = {Fiber optic sensor system for detecting movement or position of a rotating wheel bearing},
author = {Veeser, Lynn R. and Rodriguez, Patrick J. and Forman, Peter R. and Monahan, Russell E. and Adler, Jonathan M.},
abstractNote = {An improved fiber optic sensor system and integrated sensor bearing assembly for detecting movement or position of a rotating wheel bearing having a multi-pole tone ring which produces an alternating magnetic field indicative of movement and position of the rotating member. A magneto-optical material, such as a bismuth garnet iron (B.I.G.) crystal, having discrete magnetic domains is positioned in the vicinity of the tone ring so that the domains align themselves to the magnetic field generated by the tone ring. A single fiber optic cable, preferably single mode fiber, carries light generated by a source of light to the B.I.G. crystal. The light passes through the B.I.G. crystal and is refracted at domain boundaries in the crystal. The intensity of the refracted light is indicative of the amount of alignment of the domains and therefore the strength of the magnetic field. The refracted light is carried by the fiber optic cable to an optic receiver where the intensity is measured and an electrical signal is generated and sent to a controller indicating the frequency of the changes in light intensity and therefore the rotational speed of the rotating wheel bearing.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1997},
month = {Wed Jan 01 00:00:00 EST 1997}
}

Patent:

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  • A shock velocity and damage location sensor providing a means of measuring shock speed and damage location is disclosed. The sensor consists of a long series of time-of-arrival ``points`` constructed with fiber optics. The fiber optic sensor apparatus measures shock velocity as the fiber sensor is progressively crushed as a shock wave proceeds in a direction along the fiber. The light received by a receiving means changes as time-of-arrival points are destroyed as the sensor is disturbed by the shock. The sensor may comprise a transmitting fiber bent into a series of loops and fused to a receiving fiber atmore » various places, time-of-arrival points, along the receiving fibers length. At the ``points`` of contact, where a portion of the light leaves the transmitting fiber and enters the receiving fiber, the loops would be required to allow the light to travel backwards through the receiving fiber toward a receiving means. The sensor may also comprise a single optical fiber wherein the time-of-arrival points are comprised of reflection planes distributed along the fibers length. In this configuration, as the shock front proceeds along the fiber it destroys one reflector after another. The output received by a receiving means from this sensor may be a series of downward steps produced as the shock wave destroys one time-of-arrival point after another, or a nonsequential pattern of steps in the event time-of-arrival points are destroyed at any point along the sensor. 6 figs.« less
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  • A shock velocity and damage location sensor providing a means of measuring shock speed and damage location. The sensor consists of a long series of time-of-arrival "points" constructed with fiber optics. The fiber optic sensor apparatus measures shock velocity as the fiber sensor is progressively crushed as a shock wave proceeds in a direction along the fiber. The light received by a receiving means changes as time-of-arrival points are destroyed as the sensor is disturbed by the shock. The sensor may comprise a transmitting fiber bent into a series of loops and fused to a receiving fiber at various places,more » time-of-arrival points, along the receiving fibers length. At the "points" of contact, where a portion of the light leaves the transmitting fiber and enters the receiving fiber, the loops would be required to allow the light to travel backwards through the receiving fiber toward a receiving means. The sensor may also comprise a single optical fiber wherein the time-of-arrival points are comprised of reflection planes distributed along the fibers length. In this configuration, as the shock front proceeds along the fiber it destroys one reflector after another. The output received by a receiving means from this sensor may be a series of downward steps produced as the shock wave destroys one time-of-arrival point after another, or a nonsequential pattern of steps in the event time-of-arrival points are destroyed at any point along the sensor.« less
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