GB829024A - Improvements in and relating to automatic movement measuring systems - Google Patents
Improvements in and relating to automatic movement measuring systemsInfo
- Publication number
- GB829024A GB829024A GB3547456A GB3547456A GB829024A GB 829024 A GB829024 A GB 829024A GB 3547456 A GB3547456 A GB 3547456A GB 3547456 A GB3547456 A GB 3547456A GB 829024 A GB829024 A GB 829024A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- machine
- pulses
- control
- gratings
- 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 abstract 4
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000013641 positive control Substances 0.000 abstract 1
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
- G01D5/38—Forming the light into pulses by diffraction gratings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Position Or Direction (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
829,024. S.T. measuring displacement. BRUSH ELECTRICAL ENGINEERING CO. Ltd. Oct. 29, 1957 [Nov. 20, 1956], No. 35474/56. Class 40 (1). [Also in Group XL (b)] In a system for measuring the linear or angular displacement of a movable member, e.g. a machine tool member, the displacement is measured using diffraction gratings arranged as indicated in Fig. 1, light from a suitable source passes through the two horizontal gratings B and A and the two circular gratings B and A fixed to the periphery of the scanning drum to illuminate the two photo-cells B and A. The scanning drum is driven at constant speed by the motor mounted above it. With the exception of the horizontal grating A which is fixed to the machine bed the equipment is mounted on the movable member of the machine. Sine wave voltages are developed at the output of the photo-cell circuits, the voltage of cell B is of constant frequency and the frequency of voltage A varies as the machine member is moved, hence altering the phase relationship between these voltages. The voltage Vb designated the primary reference voltage is squared and provides four positive control pulses A, B, C and D during each cycle, these voltages control the first four AND gates in Fig. 4. The voltage Va is squared and differentiated and applied to the other input of the four gates. Positive Va pulses coincident with control pulses A and C provide a count in the register, the coincidence of the Va pulses with control pulses B and D operates the sensing circuit FF2 to determine whether the count shall be additive, corresponding to movement in one direction or substractive corresponding to movement in the opposite direction. Fig. 7 (not shown) indicates an arrangement of gratings for measuring displacement in two directions. In an arrangement, Fig. 5, for producing correspondence control, the sine wave reference voltage Vb is applied via a sine-cosine resolver to a phase comparator where its phase is compared with that of sine wave voltage Va, any difference, which can be introduced by rotating the resolver shaft produces an error signal to drive the machine member, cancellation of the error is produced by the resulting phase change of voltage Va. A further arrangement (Fig. 6, not shown) describes the control of the machine member by signals received from a tape reader.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3547456A GB829024A (en) | 1956-11-20 | 1956-11-20 | Improvements in and relating to automatic movement measuring systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3547456A GB829024A (en) | 1956-11-20 | 1956-11-20 | Improvements in and relating to automatic movement measuring systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB829024A true GB829024A (en) | 1960-02-24 |
Family
ID=10378128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3547456A Expired GB829024A (en) | 1956-11-20 | 1956-11-20 | Improvements in and relating to automatic movement measuring systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB829024A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3197648A (en) * | 1960-09-06 | 1965-07-27 | Honeywell Inc | Optical measuring apparatus using time interval |
US3806254A (en) * | 1971-12-08 | 1974-04-23 | Information Storage Systems | Agc servo system having error signal responsive to a non-extinguishable intensity light energy signal |
CN103323030A (en) * | 2013-06-24 | 2013-09-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Simulating turntable starting time measuring device and simulating turntable starting time measuring method |
-
1956
- 1956-11-20 GB GB3547456A patent/GB829024A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3197648A (en) * | 1960-09-06 | 1965-07-27 | Honeywell Inc | Optical measuring apparatus using time interval |
US3806254A (en) * | 1971-12-08 | 1974-04-23 | Information Storage Systems | Agc servo system having error signal responsive to a non-extinguishable intensity light energy signal |
CN103323030A (en) * | 2013-06-24 | 2013-09-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Simulating turntable starting time measuring device and simulating turntable starting time measuring method |
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