Patent US3735408A successfully refreshed from Google Patents.
Patent US3604804A successfully refreshed from Google Patents.
US3604804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncontacting motion sensor
Assignee: General Electric Co
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Filing: 1968-12-27
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Granted: 1971-09-14
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Expires: 1988-12-27
Abstract
Abstract The motion of a moving surface is measured without making mechanical contact therewith by measurement of the difference between the Doppler shifts of different components of radiation scattered from a portion of the surface. In one specific embodiment of the invention, two coherent beams of light derived from a single laser are directed so as to be incident upon the same surface portion of a moving object from different directions, and light scattered from both of the incident beams by the surface is observed by a light detector. The detector yields a signal which oscillates at a frequency equal to the difference between the two Doppler shifts. This difference frequency is independent of scattering direction and is directly proportional to the component of the velocity of the illuminated surface in a direction determined solely by the orientation of the two incident beams.
Inventors
- 👤 Carl M Penney
- 👤 Henry Hurwitz Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:29
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/50; G01S17/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
In a strip-processing mill, a device for measuring the velocity component in a given direction of a moving strip including: a. a laser device for generating a beam of coherent light; b. beam directing means including b1 a partially reflecting means for directing a first component of the generated light beam toward the strip surface and for transmitting a second component thereof and b2. a totally reflecting surface for directing the second component of the generated light beam toward the strip surface; and c. a light detector for obtaining a signal which oscillates at a frequency equal to the difference in Doppler shifts imparted to the light scattered from the first and second component beams by said surface.
Claim 2
Dependent Claim
118 words
In a strip-processing mill, a device for measuring the velocity component in a given direction of a moving strip including: a. a laser device for generating a beam of coherent light; b. beam directing means including b1 a partially reflecting means for directing a first component of the generated light beam toward the strip surface and for transmitting a second component thereof and b2. a totally reflecting surface for directing the second component of the generated light beam toward the strip surface; and c. a light detector for obtaining a signal which oscillates at a frequency equal to the difference in Doppler shifts imparted to the light scattered from the first and second component beams by said surface.
Claim 3
Dependent Claim
36 words
In a strip processing mill, a device for measuring the velocity of the moving strip as recited in claim 1, wherein said light detector is positioned along the normal to the average plane of strip surface.
Claim 4
Dependent Claim
58 words
In a strip-processing mill, a device for measuring the velocity of a moving strip as recited in claim 1, wherein said partially reflecting and said totally reflecting means are positioned to cause said component beams to lie in a plane intersecting the plane of said strip in a line parallel to the direction of movement of said strip.
Claim 5
Dependent Claim
111 words
Apparatus for measuring a component of velocity is a predetermined direction of a moving surface and comprising means for generating a laser beam, means for separating said beam into two components and for directing each said component upon a common area of said surface including a partially reflecting means for one said component and a totally reflecting means for the other of said components, and sensing means disposed with respect to said surface to receive reflections of said two component beams from said surface for determining the difference in Doppler shift frequency of portions of said two component beams to measure the rate of movement of said surface in said direction.
Claim 6
Dependent Claim
111 words
Apparatus for measuring a component of velocity is a predetermined direction of a moving surface and comprising means for generating a laser beam, means for separating said beam into two components and for directing each said component upon a common area of said surface including a partially reflecting means for one said component and a totally reflecting means for the other of said components, and sensing means disposed with respect to said surface to receive reflections of said two component beams from said surface for determining the difference in Doppler shift frequency of portions of said two component beams to measure the rate of movement of said surface in said direction.
Claim 7
Dependent Claim
32 words
Apparatus as described in claim 4, wherein said component beams are in a plane intersecting the plane of said surface in a line parallel to the direction of motion of said surface.
Claim 8
Dependent Claim
41 words
Apparatus according to claim 4 wherein said two component beams are directed upon said surface at equal angles to the normal of the average plane of said surface to sense a velocity component parallel to the average plane of said surface.
Claim 9
Dependent Claim
71 words
Apparatus for measuring the rate of movement of a surface according to claim 6 with a further provision that the respective said reflecting means are each positioned to direct their respective component beams upon said surface at known angles to opposite sides of the normal to the average planes of said surface in a plane intersecting said surface plane in a line parallel to the direction of movement of said surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |