GB913079A - Improvements in or relating to distance measuring apparatus - Google Patents

Improvements in or relating to distance measuring apparatus

Info

Publication number
GB913079A
GB913079A GB138360A GB138360A GB913079A GB 913079 A GB913079 A GB 913079A GB 138360 A GB138360 A GB 138360A GB 138360 A GB138360 A GB 138360A GB 913079 A GB913079 A GB 913079A
Authority
GB
United Kingdom
Prior art keywords
electrodes
spacing
separation
measuring
output
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
GB138360A
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.)
WAYNE KERR LAB Ltd
Original Assignee
WAYNE KERR LAB 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 WAYNE KERR LAB Ltd filed Critical WAYNE KERR LAB Ltd
Priority to GB138360A priority Critical patent/GB913079A/en
Publication of GB913079A publication Critical patent/GB913079A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object

Abstract

913,079. Determining physical dimensions. WAYNE KERR LABORATORIES Ltd., and CALVERT, R. March 6, 1961 [Jan. 14, 1960], No. 1383/60. Addition to 912,041. Class 37. In apparatus for measuring the spacing between two conductive surfaces, a pair of capacitive electrodes are arranged a known distance apart and facing the surfaces. The invention makes use of the principle described in the parent Specification of the effect on the output voltage of a high-gain amplifier of varying the capacitance connected in a negative feed-back path. Constant current sources 17 feed amplifiers 15 each having the capacitance of electrodes 12 connected in a negative feed-back path via the earthed output terminal 19. The output voltages are approximately proportional to the spacing between members 12, 18. The sum of the output voltages may be obtained by an adding circuit 20 comprising a negative feedback amplifier 21 and resistors 22. The output of amplifier 21 is rectified at 25 and indicated on a meter 24, the reading of which is added to the separation between electrodes 12 to give the separation between surfaces 18. Guard rings 13 are provided. Measuring moving bodies.-Fig. 3 shows a pair of capacitive electrodes measuring the width of a moving metal billet 40. In this case the outputs of the amplifiers 15 are coupled by transformers (Fig. 5, not shown) to an indicator, one of the transformers reversing the phase so that the indication is proportional to the difference in spacing of electrodes 41, 42 from the body 40. Rail gauges.-The apparatus may be mounted on a railway vehicle, as in Fig. 2, and capacitive electrodes 10, 11 used to determine the separation between the rails 30, 31. A depth gauge is illustrated in Fig. 4 (not shown).
GB138360A 1960-01-14 1960-01-14 Improvements in or relating to distance measuring apparatus Expired GB913079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB138360A GB913079A (en) 1960-01-14 1960-01-14 Improvements in or relating to distance measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB138360A GB913079A (en) 1960-01-14 1960-01-14 Improvements in or relating to distance measuring apparatus

Publications (1)

Publication Number Publication Date
GB913079A true GB913079A (en) 1962-12-19

Family

ID=9721057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB138360A Expired GB913079A (en) 1960-01-14 1960-01-14 Improvements in or relating to distance measuring apparatus

Country Status (1)

Country Link
GB (1) GB913079A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2657898A1 (en) * 1990-02-06 1991-08-09 Plasser Bahnbaumasch Franz RAILWAY CONSTRUCTION MACHINE FOR BAMBLING BEDDING.
NL2004052C2 (en) * 2010-01-05 2011-07-06 Mapper Lithography Ip Bv Capacitive sensing system.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2657898A1 (en) * 1990-02-06 1991-08-09 Plasser Bahnbaumasch Franz RAILWAY CONSTRUCTION MACHINE FOR BAMBLING BEDDING.
NL2004052C2 (en) * 2010-01-05 2011-07-06 Mapper Lithography Ip Bv Capacitive sensing system.

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