Patent US3799671A successfully refreshed from Google Patents.
US3799671A
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US
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Recording head for an optical correlation velocity meter
Assignee: Hasler AG
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Filing: 1972-02-22
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Granted: 1974-03-26
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Expires: 1992-02-22
Abstract
Abstract In a recording head for an optical correlation velocity meter there is provided means having a single lens for illuminating two points on the surface of an object moving relative to the recording head and means for transmitting light reflected from said two points to a pair of photo-electric devices which feed signals to an electronic evaluator which calculates the relative velocity of the object.
Inventors
- 👤 J Schweizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:23
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806; G01P3/803
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A recording head for an optical correlation velocity meter for the measurement of the relative velocity between the recording head and a surface opposite to it by means of a comparison of the light reflected from a first and a second illuminated surface point, which are fixed in relation to the recording head and are moved along a path one behind the other on the surface referred to, the recording head comprising a light source, a prism dividing the light of said light source into a first and a second illuminating light beam, a single objective which directs the first light beam onto the first surface point and the second light beam onto the second surface point, a semitransparent mirror connected in the path of said first and second light beams between said prism and said objective, said objective and said mirror forming an image of the first surface point at a first location and an image of the second surface point at a second location, and a first and a second photo-electric converter connected at said first and second location respectively.
Claim 2
Dependent Claim
182 words
A recording head for an optical correlation velocity meter for the measurement of the relative velocity between the recording head and a surface opposite to it by means of a comparison of the light reflected from a first and a second illuminated surface point, which are fixed in relation to the recording head and are moved along a path one behind the other on the surface referred to, the recording head comprising a light source, a prism dividing the light of said light source into a first and a second illuminating light beam, a single objective which directs the first light beam onto the first surface point and the second light beam onto the second surface point, a semitransparent mirror connected in the path of said first and second light beams between said prism and said objective, said objective and said mirror forming an image of the first surface point at a first location and an image of the second surface point at a second location, and a first and a second photo-electric converter connected at said first and second location respectively.
Claim 3
Dependent Claim
85 words
A recording head as claimed in claim 1, wherein said prism is a first polarization prism, and including a second polarization prism located between the semi-transparent mirror and the photo-electric converters which transmits both the beams which oriGinate from the first and second surface points respectively and are polarized in planes perpendicular to one another onto the first and second photo-electric converters respectively, and weakens any light scatter from the first or second surface points respectively falling upon the second and first photo-electric converter respectively.
Claim 4
Dependent Claim
19 words
A recording head as claimed in claim 1, wherein the illuminating beams are focussed on to the surface points.
Claim 5
Dependent Claim
34 words
A recording head as claimed in claim 1, wherein the surface points illuminated from the objective have a diameter of up to 100 Mu m and a mutual spacing of up to 1 mm.
Claim 6
Dependent Claim
36 words
A recording head as set forth in claim 2, wherein the virtual point in the first polarization prism from which the first and second light beam emerge is located in the focal point of the objective.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |