GB1104756A - Improvements in methods and apparatus for phase comparison - Google Patents
Improvements in methods and apparatus for phase comparisonInfo
- Publication number
- GB1104756A GB1104756A GB2685564A GB2685564A GB1104756A GB 1104756 A GB1104756 A GB 1104756A GB 2685564 A GB2685564 A GB 2685564A GB 2685564 A GB2685564 A GB 2685564A GB 1104756 A GB1104756 A GB 1104756A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- gratings
- photo
- source
- value
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/52—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another additionally providing control of relative angular displacement
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Optical Transform (AREA)
Abstract
1,104,756. Photo-electric control system. NATIONAL RESEARCH DEVELOPMENT CORPORATION. June 28, 1965 [June 29, 1964], No. 26855/64. Heading G1A. In a method of measuring a variable quantity such as the angular displacement of an output shaft of a machine by comparing it with a fixed or variable reference value, e.g. the angular displacement of an input shaft, an A. C. signal representing either the value or the quantity is applied to intensity modulate a modulatable light-source optical gratings are caused to move relatively to one another in accordance with either the quantity or the value respectively, and the output of a photo-cell illuminated by the source through the gratings provides a signal representing the difference between the quantity and the value. The amplified output from a photo-cell PE1, Fig. 2, actuated by a tungsten lamp TL1 through a driven radial grating RG1 and an index grating IG1, is applied to a gallium arsenide lamp GAL serving as a source to a similar pair of gratings coupled to an output shaft. The rectified output of photocell PE2 of the last named gratings provides an error signal for control or other purposes. The motion of a single body, rotary or linear, may be controlled by an oscillator output or by a recorded signal being used to modulate the light-source of a pair of gratings one of which is coupled to the body. The phase of the modulation relative to the photo-cell output should be such as to produce maximum signal on departure from zero error.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2685564A GB1104756A (en) | 1964-06-29 | 1964-06-29 | Improvements in methods and apparatus for phase comparison |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2685564A GB1104756A (en) | 1964-06-29 | 1964-06-29 | Improvements in methods and apparatus for phase comparison |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1104756A true GB1104756A (en) | 1968-02-28 |
Family
ID=10250314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2685564A Expired GB1104756A (en) | 1964-06-29 | 1964-06-29 | Improvements in methods and apparatus for phase comparison |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1104756A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2352811A (en) * | 1999-08-06 | 2001-02-07 | Mitutoyo Corp | Optical encoder |
-
1964
- 1964-06-29 GB GB2685564A patent/GB1104756A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2352811A (en) * | 1999-08-06 | 2001-02-07 | Mitutoyo Corp | Optical encoder |
GB2352811B (en) * | 1999-08-06 | 2004-09-29 | Mitutoyo Corp | Optical encoder |
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