GB1123950A - Improvements in or relating to speed measuring apparatus - Google Patents
Improvements in or relating to speed measuring apparatusInfo
- Publication number
- GB1123950A GB1123950A GB4691167A GB4691167A GB1123950A GB 1123950 A GB1123950 A GB 1123950A GB 4691167 A GB4691167 A GB 4691167A GB 4691167 A GB4691167 A GB 4691167A GB 1123950 A GB1123950 A GB 1123950A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- strip
- photo
- projected
- reference point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/80—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
- G01P3/806—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means in devices of the type to be classified in G01P3/68
Abstract
1,123,950. Measuring speed photo-electrically. MARCONI CO. Ltd. July 12, 1965 [Aug. 5, 1967], No. 46911/67. Divided out of 1,118, 879. Heading G1A. The invention relates to the photo-electric determination of the relative speed between a member and a reference point. The member may be a moving steel strip emerging from a rolling mill, the speed being measured relative to a fixed reference point. If the member is a road, the reference point is a moving vehicle the speed of which is to be measured. In the measurement of steel strip velocity, two single spaced lines 9, 9' are projected on to the strip 1 and the reflected light received through lenses 11, 11' by photo-cells 12, 12'. The output of cell 12 is delayed by a fixed amount and the two outputs fed to a differential circuit 14. The distance between the projected lines is adjusted until the difference signal is zero and the setting of the adjustment means 10 gives an indication of the speed. If instead of single lines, two similar patterns, spaced apart, are projected on to the strip, the photo-cell output contains a component dependent on strip velocity. If the strip is hot and lightemitting or receives general illumination, the projector 8 can be dispensed with the reflected light focused through grids or slits on to the cells 12, 12'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4691167A GB1123950A (en) | 1964-08-05 | 1964-08-05 | Improvements in or relating to speed measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4691167A GB1123950A (en) | 1964-08-05 | 1964-08-05 | Improvements in or relating to speed measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1123950A true GB1123950A (en) | 1968-08-14 |
Family
ID=10443037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4691167A Expired GB1123950A (en) | 1964-08-05 | 1964-08-05 | Improvements in or relating to speed measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1123950A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981003708A1 (en) * | 1980-06-10 | 1981-12-24 | Broken Hill Pty Co Ltd | Measurement of speed and/or length |
-
1964
- 1964-08-05 GB GB4691167A patent/GB1123950A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981003708A1 (en) * | 1980-06-10 | 1981-12-24 | Broken Hill Pty Co Ltd | Measurement of speed and/or length |
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