GB991710A - Improvements in or relating to devices for measuring displacements - Google Patents
Improvements in or relating to devices for measuring displacementsInfo
- Publication number
- GB991710A GB991710A GB5862A GB5862A GB991710A GB 991710 A GB991710 A GB 991710A GB 5862 A GB5862 A GB 5862A GB 5862 A GB5862 A GB 5862A GB 991710 A GB991710 A GB 991710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- grating
- cell
- fringes
- jan
- 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
991,710. Optical apparatus. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Jan. 1, 1962 [Jan. 4, 1961], No. 58/62. Heading G2J. [Also in Division G4] The invention provides an apparatus for the measurement of the displacement of one object relative to another and comprises a reflecting diffraction grating to which one object is fixed. MoirÚ fringes are obtained by reflection of a first part of the grating on to a second part (which may be coincident with the first part) and are detected by a photo-cell connected to the other object. The optical system is such that the light source and the photo-cells are at infinity as viewed from the respective parts of the grating. The number of pulses generated by the photo-cell is a function of the displacement. A first embodiment, Fig. 1, employs an annular grating R and includes lenses L and mirrors S. The light source is at B and the photo-cell at F. In a second embodiment, Fig. 2, light from source B passes through aperture H in lens S2, and the fringes are produced by reflecting an image of the grating upon itself. The resultant fringe pattern is detected by photo-cell F. In order to determine the direction of motion of the grating a double refracting plate is inserted in the light path and just above the grating. This produces two orthogonally polarized beams which can be separated and passed to two photo-cells. Further, it may be desirable to phase modulate the photo-cell outputs by oscillating a part of the optical system, e.g. mirror S2 in Fig. 2. Specifications 782,831, 906,101 and 928,564 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL259724 | 1961-01-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB991710A true GB991710A (en) | 1965-05-12 |
Family
ID=19752798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5862A Expired GB991710A (en) | 1961-01-04 | 1962-01-01 | Improvements in or relating to devices for measuring displacements |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH401500A (en) |
| GB (1) | GB991710A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3482107A (en) * | 1966-07-26 | 1969-12-02 | Leitz Ernst Gmbh | Photoelectric position sensing device comprising light diffracting phase gratings using polarizer beam splitters for sensing the time phase position of the gratings |
| US3628870A (en) * | 1970-07-02 | 1971-12-21 | Olympus Optical Co | Device for measuring amount of displacements with aid of gratings |
| US4115008A (en) * | 1976-05-08 | 1978-09-19 | Ferranti Limited | Displacement measuring apparatus |
| GB2187282A (en) * | 1986-02-28 | 1987-09-03 | Canon Kk | Rotary encoder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3905730C2 (en) * | 1989-02-24 | 1995-06-14 | Heidenhain Gmbh Dr Johannes | Position measuring device |
-
1962
- 1962-01-01 GB GB5862A patent/GB991710A/en not_active Expired
- 1962-01-03 CH CH3362A patent/CH401500A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3482107A (en) * | 1966-07-26 | 1969-12-02 | Leitz Ernst Gmbh | Photoelectric position sensing device comprising light diffracting phase gratings using polarizer beam splitters for sensing the time phase position of the gratings |
| US3628870A (en) * | 1970-07-02 | 1971-12-21 | Olympus Optical Co | Device for measuring amount of displacements with aid of gratings |
| US4115008A (en) * | 1976-05-08 | 1978-09-19 | Ferranti Limited | Displacement measuring apparatus |
| GB2187282A (en) * | 1986-02-28 | 1987-09-03 | Canon Kk | Rotary encoder |
| GB2187282B (en) * | 1986-02-28 | 1991-01-02 | Canon Kk | Rotary encoder |
| US5101102A (en) * | 1986-02-28 | 1992-03-31 | Canon Kabushiki Kaisha | Rotary encoder having a plurality of beams emitted by a diffraction grating |
Also Published As
| Publication number | Publication date |
|---|---|
| CH401500A (en) | 1965-10-31 |
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