EP0420172A1
Expired / Lapsed
EP
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Speckle velocity sensor
Assignee: Omron Corp
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Filing: 1990-09-26
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Granted: —
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Expires: 2010-09-26
Abstract
Abstract The invention relates to a speckle speed sensor using either the balance correlation speed measurement method or the zero cross speed measuring method. The speckle speed sensor comprises at least one light-receiving means (8, 9) for reception of a speckle pattern produced by projection of a laser beam on a moving object (7). The light-receiving means (8, 9) uses a light reception aperture (20) elongated in a direction perpendicular to the direction of movement (5) of the speckle pattern. The elongated aperture configuration is conducive to a diminished measurement error.
Inventors
- 👤 Hidenori Omron Corporation Miyazaki
- 👤 Hiroshi Omron Corporation Kitajima
- 👤 Tsukasa Omron Corporation Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:35
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A speckle velocity sensor comprising: light projecting means for projecting light on a moving object to create a moving reflection speckle pattern; and light receiving means for reception of said speckle pattern reflected by said moving object wherein said light receiving means includes at least one light reception aperture elongated in a direction substantially perpendicular to a direction of movement of said speckle pattern.
Claim 2
Dependent Claim
64 words
A speckle velocity sensor comprising: light projecting means for projecting light on a moving object to create a moving reflection speckle pattern; and light receiving means for reception of said speckle pattern reflected by said moving object wherein said light receiving means includes at least one light reception aperture elongated in a direction substantially perpendicular to a direction of movement of said speckle pattern.
Claim 3
Dependent Claim
26 words
The speckle velocity sensor of claim 1, wherein said light projecting means comprises a laser beam source which projects a laser beam onto said moving object.
Claim 4
Dependent Claim
15 words
The speckle velocity sensor of claim 1, wherein said light reception aperture is substantially rectangular.
Claim 5
Dependent Claim
21 words
The speckle velocity sensor of claim 1, wherein said light reception aperture is oblong having substantially arcuate top and bottom sides.
Claim 6
Dependent Claim
19 words
The speckle velocity sensor according to claim 1, wherein said light reception aperture is substantially elliptical having curved sides.
Claim 7
Dependent Claim
45 words
The speckle velocity sensor according to claim 1, further comprising means for performing a velocity correlation measurement producing a correlation characteristic curve having a peak measurement point and wherein said elongated light-receiving means produces increased symmetrical correlation and frequency distribution about said peak measurement point.
Claim 8
Dependent Claim
30 words
The speckle velocity sensor according to claim 6, such that said elongated light reception aperture has its narrowest dimension substantially parallel to a direction of movement of said speckle pattern.
Claim 9
Dependent Claim
42 words
The speckle velocity sensor according to claim 1, wherein said light receiving means comprises a plurality of light receiving devices each having a reception aperture which is elongated in a direction perpendicular to a direction of the movement of said speckle pattern.
References Cited (Backward Citations)
US4311383A
Cited
EP0295720A2
Cited
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