GB829024A - Improvements in and relating to automatic movement measuring systems - Google Patents

Improvements in and relating to automatic movement measuring systems

Info

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
Application number
GB3547456A
Inventor
Henry Ashworth Prime
Thomas Leslie Perry
Nigel Arthur Frederic Williams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brush Electrical Engineering Co Ltd
Original Assignee
Brush Electrical Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brush Electrical Engineering Co Ltd filed Critical Brush Electrical Engineering Co Ltd
Priority to GB3547456A priority Critical patent/GB829024A/en
Publication of GB829024A publication Critical patent/GB829024A/en
Expired legal-status Critical Current

Links

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

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.
GB3547456A 1956-11-20 1956-11-20 Improvements in and relating to automatic movement measuring systems Expired GB829024A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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