GB1132524A

GB1132524A – Position indicating devices
– Google Patents

GB1132524A – Position indicating devices
– Google Patents
Position indicating devices

Info

Publication number
GB1132524A

GB1132524A
GB13255/66A
GB1325566A
GB1132524A
GB 1132524 A
GB1132524 A
GB 1132524A
GB 13255/66 A
GB13255/66 A
GB 13255/66A
GB 1325566 A
GB1325566 A
GB 1325566A
GB 1132524 A
GB1132524 A
GB 1132524A
Authority
GB
United Kingdom
Prior art keywords
photo
output
cell
mirror
amplifier
Prior art date
1965-03-27
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
GB13255/66A
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.)

ABB Norden Holding AB

Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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.)
1965-03-27
Filing date
1966-03-25
Publication date
1968-11-06

1966-03-25
Application filed by ASEA AB, Allmanna Svenska Elektriska AB
filed
Critical
ASEA AB

1968-11-06
Publication of GB1132524A
publication
Critical
patent/GB1132524A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

229910000831
Steel
Inorganic materials

0.000
abstract
1

230000003321
amplification
Effects

0.000
abstract
1

238000003199
nucleic acid amplification method
Methods

0.000
abstract
1

230000000717
retained effect
Effects

0.000
abstract
1

230000035945
sensitivity
Effects

0.000
abstract
1

239000010959
steel
Substances

0.000
abstract
1

Classifications

G—PHYSICS

G05—CONTROLLING; REGULATING

G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS

G05B24/00—Open-loop automatic control systems not otherwise provided for

G05B24/02—Open-loop automatic control systems not otherwise provided for electric

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

G—PHYSICS

G05—CONTROLLING; REGULATING

G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS

G05B19/00—Programme-control systems

G05B19/02—Programme-control systems electric

G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers

G05B19/06—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using cams, discs, rods, drums, or the like

G—PHYSICS

G05—CONTROLLING; REGULATING

G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

G05D3/00—Control of position or direction

G05D3/12—Control of position or direction using feedback

G05D3/20—Control of position or direction using feedback using a digital comparing device

Abstract

1,132,524. Measuring position photoelectrically. ALLMANNA SVENSKA ELEKTRISKA A.B. March 25, 1966 [March 27, 1965], No. 13255/66. Heading G1A. [Also in Division G3] The change in position of an object 22 or part of an object e. g. a moving strip 22 of steel or an illuminated paper web, is monitored by repetitively scanning light from the object across the field of view of a photo-cell 5 using an oscillating mirror 3, the output signal of the photo-cell being utilized in order to adjust the mean position of the mirror. The output J of the photo-cell comprises an A. C. waveform limited at maximum (J max ) and minimum (J min ) amplitude values by D.C. parts, due to the light directed from the mirror 7 falling outside the field of view 2#α of the photo-cell, Fig. 3 (not shown). The photo-cell output is applied to two parallel circuits. The first, a rectifier circuit 7, produces an output representative of the algebraic mean value J m of the photo-cell output J where J m = J max + J min . 2 The second, a low pass filter 8 (passing D.C. and part of the fundamental frequency of the supply current) produces an output representative of the time mean value J, such that #J = 1/T T# 0 I dt, T being a particular time and I the instantaneous value of the photo-cell output. When the mean position of the mirror is symmetrically located with respect to the centre of the object, the field of view of the photo-cell is also located symmetrically within the area scanned by light reflected from the mirror and the values J m and J are equal. If the object 22 is displaced sideways J m and J are no longer equal. The difference between these values is obtained by feeding the outputs of circuits 7 and 8 to a device 9 (a summation or subtraction device) and this difference value integrated in amplifier 10, the output of which is fed to a galvanometer 4 which gives an indication of the change in position of the object or to a device 4 which controls movement of the mean position of the mirror to equalise J m and J again. The output of amplifier 10 can also be used in a control function to influence the object before introduction into the system e.g. if the position of an edge of a strip is investigated, its speed, or the tensile force of the reel can be controlled. In order to detect if the object is outside the scanning field of the mirror 3, the output of the photo-cell is also fed to a band-pass filter 12, passing only the fundamental A. C. frequency, which is rectified at 13 and the signal level is sensed at 14. If the signal falls beneath a predetermined level, the amplifier 10 is switched out of circuit and a sawtooth circuit switched in, causing the mirror to be rotated until the object is located again, when the predetermined level is retained and the apparatus switched back to normal operation. The sensitivity of the apparatus is controlled by comparing the fundamental A. C. signal from amplifier 10 with a reference signal (using devices 27, 28) to adjust automatically the amplification of amplifier 10.

GB13255/66A
1965-03-27
1966-03-25
Position indicating devices

Expired

GB1132524A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

SE3995/65A

SE317219B
(en)

1965-03-27
1965-03-27

Publications (1)

Publication Number
Publication Date

GB1132524A
true

GB1132524A
(en)

1968-11-06

Family
ID=20263305
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB13255/66A
Expired

GB1132524A
(en)

1965-03-27
1966-03-25
Position indicating devices

Country Status (4)

Country
Link

US
(1)

US3446968A
(en)

CH
(1)

CH433486A
(en)

GB
(1)

GB1132524A
(en)

SE
(1)

SE317219B
(en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

CH465250A
(en)

*

1966-10-18
1968-11-15
Genevoise Instr Physique

Photoelectric microscope

US3526135A
(en)

*

1967-12-29
1970-09-01
Garrett Corp
Temperature detecting system

Family Cites Families (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2659823A
(en)

*

1951-09-21
1953-11-17
Jr Carl A Vossberg
Measuring system

US3041459A
(en)

*

1959-06-29
1962-06-26
Comapco Inc
Radiant energy control system

1965

1965-03-27
SE
SE3995/65A
patent/SE317219B/xx
unknown

1966

1966-03-23
CH
CH450866A
patent/CH433486A/en
unknown

1966-03-24
US
US537074A
patent/US3446968A/en
not_active
Expired – Lifetime

1966-03-25
GB
GB13255/66A
patent/GB1132524A/en
not_active
Expired

Also Published As

Publication number
Publication date

CH433486A
(en)

1967-04-15

US3446968A
(en)

1969-05-27

SE317219B
(en)

1969-11-10

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