GB787641A - Improvements relating to displacement measuring devices - Google Patents
Improvements relating to displacement measuring devicesInfo
- Publication number
- GB787641A GB787641A GB2635654A GB2635654A GB787641A GB 787641 A GB787641 A GB 787641A GB 2635654 A GB2635654 A GB 2635654A GB 2635654 A GB2635654 A GB 2635654A GB 787641 A GB787641 A GB 787641A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grating
- pattern
- photo
- cells
- movement
- 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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
- G01B21/065—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving for stretchable materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
787,641. Photo-electric control systems. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Aug. 25, 1955 [Sept. 11, 1954; Oct. 5, 1954], Nos. 26356/54 and 28592/54. Class 40 (3). [Also in Group XXXVIII] In a device for measuring linear or angular displacement the displacement is arranged to vary the relative position of a pair of optical gratings producing a repetitive pattern such as moirÚ fringes, the pattern then being " tracked " either by chasing it with a photo-electric follower or by restoring it by means of fixed cells which move the second grating. As shown (Fig. 1) the invention is applied to measuring linear displacement. A transparent cylindrical grating 1 is attached to a machine tool 4 the movement of which is to be determined. Inside this grating is a light source. Surrounding it is a short grating 2 the rulings on which are slightly inclined to those on the inner cylinder. Photocells 9 and 10 mounted in a rotatable housing 7 receive light from points spaced by 180 degrees on the repetitive pattern and are connected to a comparison circuit 11 feeding an amplifier 12 and controlling a servomotor 13 which repositions the photo-cell housing. Movement of grating 1 causes the pattern to rotate about the axis of the grating and photo-cells 9, 10 follow the pattern with consequent magnification of the grating movement. Instead of a pair of cells a single cell may be caused to receive light alternately from the two positions by a rotating shutter (Fig. 3, not shown). Instead of the photo-cells following the pattern they may be fixed and their output used to move the outer grating to maintain the pattern in its original position (Fig. 4, not shown). In the arrangement of Fig. 5 the cells 9, 10 are arranged side by side longitudinally along the slot grating 2 a halfwave change of the moirÚ pattern taking place between the photo-cells by producing a halfline shift between the two parts. The single cell arrangement already referred to may be used in this embodiment also. In the arrangement of Fig. 6 drum 42 is ruled on its periphery and photo-cells 40 are situated inside cylindrical gatings 44, 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2635654A GB787641A (en) | 1954-09-11 | 1954-09-11 | Improvements relating to displacement measuring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2635654A GB787641A (en) | 1954-09-11 | 1954-09-11 | Improvements relating to displacement measuring devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB787641A true GB787641A (en) | 1957-12-11 |
Family
ID=10242395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2635654A Expired GB787641A (en) | 1954-09-11 | 1954-09-11 | Improvements relating to displacement measuring devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB787641A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3076374A (en) * | 1958-04-07 | 1963-02-05 | Frederic W Olmstead | System and mechanism for measuring displacements |
| US3245307A (en) * | 1958-01-21 | 1966-04-12 | Philips Corp | Moire fringe apparatus for measuring small movements |
| DE1217637B (en) * | 1961-01-04 | 1966-05-26 | Philips Nv | Device for measuring displacements |
| DE1233612B (en) * | 1958-12-27 | 1967-02-02 | Hensoldt & Soehne Optik | A flat length ruler composed of several individual pieces |
| CN108557563A (en) * | 2018-03-21 | 2018-09-21 | 广西和联胜电缆有限公司 | A kind of cable rewinding machine of the uniform kinking of energy |
-
1954
- 1954-09-11 GB GB2635654A patent/GB787641A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3245307A (en) * | 1958-01-21 | 1966-04-12 | Philips Corp | Moire fringe apparatus for measuring small movements |
| US3076374A (en) * | 1958-04-07 | 1963-02-05 | Frederic W Olmstead | System and mechanism for measuring displacements |
| DE1233612B (en) * | 1958-12-27 | 1967-02-02 | Hensoldt & Soehne Optik | A flat length ruler composed of several individual pieces |
| DE1217637B (en) * | 1961-01-04 | 1966-05-26 | Philips Nv | Device for measuring displacements |
| CN108557563A (en) * | 2018-03-21 | 2018-09-21 | 广西和联胜电缆有限公司 | A kind of cable rewinding machine of the uniform kinking of energy |
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