GB1389307A – Method of and a device for measuring linear and angular displacements
– Google Patents
GB1389307A – Method of and a device for measuring linear and angular displacements
– Google Patents
Method of and a device for measuring linear and angular displacements
Info
Publication number
GB1389307A
GB1389307A
GB2367172A
GB2367172A
GB1389307A
GB 1389307 A
GB1389307 A
GB 1389307A
GB 2367172 A
GB2367172 A
GB 2367172A
GB 2367172 A
GB2367172 A
GB 2367172A
GB 1389307 A
GB1389307 A
GB 1389307A
Authority
GB
United Kingdom
Prior art keywords
fine
coarse
pulses
counter
displacement
Prior art date
1971-05-20
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
GB2367172A
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.)
INST ELEKTROTECHNIKI
Original Assignee
INST ELEKTROTECHNIKI
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.)
1971-05-20
Filing date
1972-05-19
Publication date
1975-04-03
1972-05-19
Application filed by INST ELEKTROTECHNIKI
filed
Critical
INST ELEKTROTECHNIKI
1975-04-03
Publication of GB1389307A
publication
Critical
patent/GB1389307A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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 infra-red, visible, or ultra-violet 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 infra-red, visible, or ultra-violet 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 infra-red, visible, or ultra-violet 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
1389307 Measuring displacement photoelectrically INSTYTUT ELEKTROTECHNIKI 19 May 1972 [20 May 1971] 23671/72 Heading G1A A displacement measuring system comprises a fine and a coarse channel in each of which displacements are transduced into light signals and then into rectangular pulses which are counted, the fine channel counter being reset to an initial value whenever a unit of displacement is counted in the coarse channel. This ensures that errors in the fine channel produced by spurious or missing pulses are not accumulated. The transducer, Fig.1, comprises a light source 10 illuminating moving gratings 1, 3 short fixed gratings 2, 4 being used to produce Moire fringes which are detected by a lens 12 and four photodetectors 5,6,7,8. The upper gratings 1, 2 form a coarse measurement system the fringes from which are received by detectors 5, 6 in a quadrature relationship. Similarly detectors 7,8 produce quadrature related signals from a fine measurement system using the lower gratings 3, 4. In a second arrangement, Fig.4 (not shown) the position of a carriage driven by a lead screw is determined by a linear grating arrangement producing a coarse measurement and a rotary grating arrangement, driven by the lead screw, producing the fine measurement. In a third arrangement, Fig.5 (not shown) the coarse and fine gratings are provided concentrically on a single rotatable disc. In the processing circuit, Fig.6, the light inputs to the coarse and fine detector systems 20, 21 are converted to electrical signals which are amplified and squared (22,23,24,25) to produce quadrature related rectangular pulses. These pulses are applied to circuits 26, 27 for determining the direction of the displacement and for producing needle pulses which are applied to the inputs of coarse and fine bi-directional counters 32, 33. The counting direction is determined by a control circuit 30 receiving inputs from the direction detectors 26, 27 and from a sign detector circuit 31 whose state changes when the coarse displacement passes through zero. The fine counter is provided with an overflow lock-out circuit 36 which prevents fine pulses from incrementing the counter when it has reached its maximum count and from decrementing the counter when it is at zero. The coarse pulses are also used to reset the fine counter but in the count-down mode lock-out circuit responds to the coarse pulses to set the fine counter to its maximum value. A circuit 28 is also provided which indicates by means of a lamp 47 that the displacement is less than one fine interval from a coarse position and this is a permissible datum from which measurements can be taken. Operation of a push button 48 resets the coarse counter to zero at the desired datum position. The outputs of the coarse and fine counters and the sign detector circuit 31 are applied to a digital display unit 34.
GB2367172A
1971-05-20
1972-05-19
Method of and a device for measuring linear and angular displacements
Expired
GB1389307A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
PL14826671A
PL72243B1
(en)
1971-05-20
1971-05-20
Publications (1)
Publication Number
Publication Date
GB1389307A
true
GB1389307A
(en)
1975-04-03
Family
ID=19954422
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2367172A
Expired
GB1389307A
(en)
1971-05-20
1972-05-19
Method of and a device for measuring linear and angular displacements
Country Status (5)
Country
Link
CS
(1)
CS154206B2
(en)
DD
(1)
DD98365A5
(en)
DE
(1)
DE2224639A1
(en)
GB
(1)
GB1389307A
(en)
PL
(1)
PL72243B1
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
CN115790452A
(en)
*
2023-02-06
2023-03-14
西安知象光电科技有限公司
Moire representation and measurement method for three-dimensional topography of gear tooth surface
1971
1971-05-20
PL
PL14826671A
patent/PL72243B1/xx
unknown
1972
1972-05-18
DD
DD16308472A
patent/DD98365A5/xx
unknown
1972-05-19
DE
DE19722224639
patent/DE2224639A1/de
active
Pending
1972-05-19
GB
GB2367172A
patent/GB1389307A/en
not_active
Expired
1972-05-22
CS
CS348772A
patent/CS154206B2/cs
unknown
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
CN115790452A
(en)
*
2023-02-06
2023-03-14
西安知象光电科技有限公司
Moire representation and measurement method for three-dimensional topography of gear tooth surface
Also Published As
Publication number
Publication date
PL72243B1
(en)
1974-06-29
DE2224639A1
(en)
1972-11-30
DD98365A5
(en)
1973-06-12
CS154206B2
(en)
1974-03-29
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Legal Events
Date
Code
Title
Description
1975-12-03
CSNS
Application of which complete specification have been accepted and published, but patent is not sealed
