Doppler sensor for the derivation of torsional slip, friction and related parameters
First Claim
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1. A method for measuring properties of a travel vehicle relative to a travel surface, upon which the travel vehicle travels, comprising:
- providing an incident light from a light source to the travel surface;
collecting light reflected from the travel surface;
determining a surface induced Doppler shift from the incident and collected light; and
determining at least a motion property of the travel vehicle based on the determined surface induced Doppler shift by determining a torsional slip of a rotating surface of a contact between the travel vehicle and the travel surface.
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Abstract
An optical method and apparatus are described for the measurement of properties of a travel vehicle or a travel surface upon which the travel vehicle travels, which includes providing an incident light from a light source to the travel surface, collecting light reflected from the travel surface, determining a surface induced Doppler shift from the incident and collected light and determining at least one of a motion property of the travel vehicle and a surface property of the travel surface based on the determined surface induced Doppler shift.
13 Citations
23 Claims
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1. A method for measuring properties of a travel vehicle relative to a travel surface, upon which the travel vehicle travels, comprising:
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providing an incident light from a light source to the travel surface; collecting light reflected from the travel surface; determining a surface induced Doppler shift from the incident and collected light; and determining at least a motion property of the travel vehicle based on the determined surface induced Doppler shift by determining a torsional slip of a rotating surface of a contact between the travel vehicle and the travel surface.
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2. A method for measuring torsional slip, comprising:
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measuring a tangential velocity of a surface rotating about an axis via a Doppler shifted return of a first laser beam; measuring a translational velocity of the axis via a Doppler shifted return of a second laser beam; and deriving a torsional slip of the rotating surface from the difference between the tangential velocity and the translational velocity. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring torsional slip, comprising:
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using first and second laser beams to simultaneously generate respective first and second Doppler shifted return beams from a first surface rotating about an axis and from a second surface, wherein movement of the second surface corresponds to the translational velocity of the axis; processing the respective Doppler shifted return beams to determine, respectively, a tangential velocity of the rotating surface and a translational velocity of the axis; and deriving the torsional slip of the rotating surface from the difference between the tangential velocity and the translational velocity. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus for measuring torsional slip, comprising:
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means for using a Doppler shifted return of a first laser beam to measure tangential velocity of a surface rotating about an axis; means for using a Doppler shifted return of a second laser beam to measure translational velocity of the axis; and means for deriving the torsional slip of the rotating surface from the difference between the tangential velocity and the translational velocity. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification