GB762396A - Improvements in or relating to apparatus for measuring small distances - Google Patents

Improvements in or relating to apparatus for measuring small distances

Info

Publication number
GB762396A
GB762396A GB981854A GB981854A GB762396A GB 762396 A GB762396 A GB 762396A GB 981854 A GB981854 A GB 981854A GB 981854 A GB981854 A GB 981854A GB 762396 A GB762396 A GB 762396A
Authority
GB
United Kingdom
Prior art keywords
pair
electrodes
bridge
gauge
probe
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
GB981854A
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 GB981854A priority Critical patent/GB762396A/en
Publication of GB762396A publication Critical patent/GB762396A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

762,396. Electric measuring systems. WAYNE KERR LABORATORIES, Ltd., and CALVERT, R. April 4, 1955 [April 2, 1954], No. 9818/54. Class 40 (1). [Also in Group XXXVI] Apparatus for measuring small distances comprises an electrical bridge for comparing two capacities, one formed by a first pair of electrodes movable towards and away from one another by calibrated adjusting means, and the other formed by a second pair of electrodes. movable towards and away from one another and of effective electrical area which is a known small fraction of that of the first pair, whereby, when the bridge is balanced, the spacing of the second pair of electrodes is a known fraction of that of the first pair. The second pair of electrodes may be formed by a probe and a gauge to be tested, and the probe and a master gauge successively. In Fig. 1 the ratio arms of the bridge are formed by the two secondary windings 12, 13 of a transformer 10, the primary 11 of which is fed from an alternating current source. The neutral line 14 is connected to one end of a winding 15 the other end of which is connected to electrodes 22, 23 of the pairs 20, 21. The remaining electrodes 26, 27 of the pairs are connected to the free ends of windings 12, 13. The electrodes of pair 21 are composed of a small plate 23 and a large plate 27, the small plate being surrounded by a guard ring 25 connected to the neutral line 14. The plates are relatively movable by a micrometer reading to one inch in ten thousandths. Similarly a large electrode 26 co-operates with a small probe electrode 22 surrounded by a guard ring 24 connected to the neutral line 14. The effective area of plates 22, 26 may be one hundredth of that of plates 23, 27. The output of winding 17 is fed to a detector 18 to indicate out-of-balance of the bridge. To test a gauge, the probe 22 is placed a convenient distance from the surface of the gauge, which is connected to act as electrode 26. The bridge is then balanced by the micrometer. The standard gauge is substituted, and the bridge rebalanced. The difference between the two micrometer readings is then one hundred times the difference between the gauge dimensions. The probe is arranged on the end of the inner conductor of a screened cable, the screen being connected to the guard ring.
GB981854A 1954-04-02 1954-04-02 Improvements in or relating to apparatus for measuring small distances Expired GB762396A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB981854A GB762396A (en) 1954-04-02 1954-04-02 Improvements in or relating to apparatus for measuring small distances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB981854A GB762396A (en) 1954-04-02 1954-04-02 Improvements in or relating to apparatus for measuring small distances

Publications (1)

Publication Number Publication Date
GB762396A true GB762396A (en) 1956-11-28

Family

ID=9879372

Family Applications (1)

Application Number Title Priority Date Filing Date
GB981854A Expired GB762396A (en) 1954-04-02 1954-04-02 Improvements in or relating to apparatus for measuring small distances

Country Status (1)

Country Link
GB (1) GB762396A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880390A (en) * 1956-12-03 1959-03-31 Wayne Kerr Lab Ltd Apparatus for measuring small distances
GB2180942A (en) * 1985-09-24 1987-04-08 Superba Sa Linear mass monitoring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880390A (en) * 1956-12-03 1959-03-31 Wayne Kerr Lab Ltd Apparatus for measuring small distances
GB2180942A (en) * 1985-09-24 1987-04-08 Superba Sa Linear mass monitoring apparatus
GB2180942B (en) * 1985-09-24 1990-04-18 Superba Sa Linear mass monitoring apparatus

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