GB1517364A - Apparatus for measuring a linear quantity - Google Patents

Apparatus for measuring a linear quantity

Info

Publication number
GB1517364A
GB1517364A GB38191/75A GB3819175A GB1517364A GB 1517364 A GB1517364 A GB 1517364A GB 38191/75 A GB38191/75 A GB 38191/75A GB 3819175 A GB3819175 A GB 3819175A GB 1517364 A GB1517364 A GB 1517364A
Authority
GB
United Kingdom
Prior art keywords
transducer
capacitance
measuring
capacitor
variable
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
GB38191/75A
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB38191/75A priority Critical patent/GB1517364A/en
Priority to US05/720,822 priority patent/US4086528A/en
Priority to DE19762641758 priority patent/DE2641758A1/en
Priority to FR7627911A priority patent/FR2392363A1/en
Publication of GB1517364A publication Critical patent/GB1517364A/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
    • 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
    • G01D5/12—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 using electric or magnetic means
    • G01D5/14—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 using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—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 using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

1517364 Measuring capacitance UNITED KINGDOM ATOMIC ENERGY AUTHORITY 2 Sept 1976 [17 Sept 1975 16 Oct 19751 38191/75 Heading G1U The capacitative measurement system of Specification 1340703 is modified in that the capacitance capacitative transducer is compared to a fixed reference capacitor, instead of a comparison between the two variable capacitors of the earlier transducer. Preferably, the transducer retains the two variable capacitances these being connected in parallel in the unknown arm of the bridge network. The transducer may be as disclosed in the earlier patent, or two wires in a glass tube secured to the bottom of a stainless steel tube for liquid level measurement Fig. 4 (not shown). For measuring the height of the mercury column in a thermometer, the wires lie along opposite sides of the thermometer tube in a space enclosed by a PTFE sleeve Fig. 5 (not shown). In a further transducer, the capacitance is formed between an earthed body and a screened wire probe Fig. 7 (not shown) for thickness measurements. As illustrated in Fig. 6 (not shown), the voltage applied to the variable capacitance arm may be varied in accordance with the measurement system output, to keep the charge on the capacitor constant thereby producing a linear relationship between the voltage and the plate spacing of the capacitor.
GB38191/75A 1975-09-17 1975-09-17 Apparatus for measuring a linear quantity Expired GB1517364A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB38191/75A GB1517364A (en) 1975-09-17 1975-09-17 Apparatus for measuring a linear quantity
US05/720,822 US4086528A (en) 1975-09-17 1976-09-07 Capacitive transducers
DE19762641758 DE2641758A1 (en) 1975-09-17 1976-09-16 DEVICE FOR DETERMINING A LINEAR SIZE
FR7627911A FR2392363A1 (en) 1975-09-17 1976-09-16 LINEARLY VARIABLE QUANTITY MEASURING DEVICE, INCLUDING A CAPACITIVE TRANSDUCER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38191/75A GB1517364A (en) 1975-09-17 1975-09-17 Apparatus for measuring a linear quantity

Publications (1)

Publication Number Publication Date
GB1517364A true GB1517364A (en) 1978-07-12

Family

ID=10401847

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38191/75A Expired GB1517364A (en) 1975-09-17 1975-09-17 Apparatus for measuring a linear quantity

Country Status (1)

Country Link
GB (1) GB1517364A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932184A1 (en) * 1978-08-08 1980-02-21 Atomic Energy Authority Uk METHOD AND DEVICE FOR DETERMINING THE SHAPE AND SIZE OF A PART
GB2145231A (en) * 1983-08-16 1985-03-20 Atomic Energy Authority Uk Capacitive gauging apparatus
GB2239528A (en) * 1987-05-05 1991-07-03 British Gas Plc Electrically conducting lead

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932184A1 (en) * 1978-08-08 1980-02-21 Atomic Energy Authority Uk METHOD AND DEVICE FOR DETERMINING THE SHAPE AND SIZE OF A PART
GB2145231A (en) * 1983-08-16 1985-03-20 Atomic Energy Authority Uk Capacitive gauging apparatus
EP0146202A1 (en) * 1983-08-16 1985-06-26 United Kingdom Atomic Energy Authority Gauging apparatus
US4658254A (en) * 1983-08-16 1987-04-14 United Kingdom Atomic Energy Authority Gauging apparatus
GB2239528A (en) * 1987-05-05 1991-07-03 British Gas Plc Electrically conducting lead

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee