GB1209342A - Devices for measuring displacement amounts with the aid of diffraction gratings - Google Patents
Devices for measuring displacement amounts with the aid of diffraction gratingsInfo
- Publication number
- GB1209342A GB1209342A GB53168A GB53168A GB1209342A GB 1209342 A GB1209342 A GB 1209342A GB 53168 A GB53168 A GB 53168A GB 53168 A GB53168 A GB 53168A GB 1209342 A GB1209342 A GB 1209342A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grating
- optical system
- displacement
- measuring displacement
- image
- 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
- 238000006073 displacement reaction Methods 0.000 title abstract 5
- 230000003287 optical effect Effects 0.000 abstract 4
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
1,209,342. Measuring displacement. OLYMPUS KOGAKU KOGYO K.K. 3 Jan., 1968 [22 March, 1967; 20 Sept., 1967], No. 531/68. Heading G4H. [Also in Divisions G2-G3] A device for measuring displacement amounts by superimposing the image of a portion of a diffraction grating G upon another portion includes a real image optical system of unit magnification in turn including a reflection optical system arranged such that a light beam l 1 , incident upon a portion of the grating G, is directed by mirorrs M 1 , M 2 outside the grating in a direction opposite to that of the beam l 1' and is then directed by mirrors M 3 , M 4 to the grating in the same direction as the incident light beam. This super position produces a moirÚ fringe pattern the strength of which varies sinusoidally in response to displacement of the grating, the pattern being observed by a photoreceiver p and the strength variations causing electrical pulses which can be counted to indicate the amounts of displacement of the grating. As shown, the grating is moved linearly, and the optical system gives an inverted real image. In another embodiment (Figs. 6- 9, not shown), an optical system using prisms which give a mirror image is used with an an annular rotatable grating. Deviations of either grating from a plane do not affect the fringe pattern.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1736367 | 1967-03-22 | ||
| JP5983967 | 1967-09-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1209342A true GB1209342A (en) | 1970-10-21 |
Family
ID=26353865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB53168A Expired GB1209342A (en) | 1967-03-22 | 1968-01-03 | Devices for measuring displacement amounts with the aid of diffraction gratings |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1563232A (en) |
| GB (1) | GB1209342A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2187282A (en) * | 1986-02-28 | 1987-09-03 | Canon Kk | Rotary encoder |
| US5515730A (en) * | 1992-11-23 | 1996-05-14 | British Aerospace Plc | Apparatus for detecting the amplitude, frequency or modes of vibration of a vibrating panel |
-
1968
- 1968-01-03 GB GB53168A patent/GB1209342A/en not_active Expired
- 1968-03-05 FR FR1563232D patent/FR1563232A/fr not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US5515730A (en) * | 1992-11-23 | 1996-05-14 | British Aerospace Plc | Apparatus for detecting the amplitude, frequency or modes of vibration of a vibrating panel |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1563232A (en) | 1969-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |