GB867350A - Capacity change detector - Google Patents

Capacity change detector

Info

Publication number
GB867350A
GB867350A GB3851257A GB3851257A GB867350A GB 867350 A GB867350 A GB 867350A GB 3851257 A GB3851257 A GB 3851257A GB 3851257 A GB3851257 A GB 3851257A GB 867350 A GB867350 A GB 867350A
Authority
GB
United Kingdom
Prior art keywords
grid
capacitor
valve
tuned circuit
capacitance
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
GB3851257A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3851257A priority Critical patent/GB867350A/en
Priority to BE573771A priority patent/BE573771A/en
Publication of GB867350A publication Critical patent/GB867350A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

867,350. Electric tests; capacitors. TURNER, D. W. Dec. 2, 1958 [Dec. 11, 1957], No. 38512/57. Class 37. Changes in dielectric constant caused by movement of a substance between two electrodes of a sensing capacitor is followed by causing the resulting change in capacitance to vary the impedance of a tuned circuit, of which the capacitance forms part, connected to, one grid of a multi-grid valve. The valve is maintained in oscillation by a reference tuned circuit connected to a second grid, and the resulting change in anode potential of the valve is measured and indicated. Detector cell.-The detector cell comprises a cylindrical brass body 1, Fig. 1, 2, containing two cylindrical passages 2, 3 in which are mounted brass rods 4, 5 supported by silicone rubber 0-rings 6, 7, thus forming two capacitors R and S. The capacitor R is normally filled with air and acts as a reference capacitor, the other, S, acts as a sensing capacitor and can have a stream of vapour from a gas-liquid chromatography column passed through it via the inlet 8 and the outlet 9. Measuring Circuit.-The measuring circuit shown in Fig. 3 comprises a multi-grid valve 10 having a reference tuned circuit comprising inductance 12 and capacitor R and a measuring tuned circuit comprising inductor 11 and capacitor S. The output from the anode of the valve 10 is fed on to one grid of a double triode 13, 14, the other grid being maintained at a fixed D.C. potential which can be set by the potentiometer 15. The cathode circuits of the two triodes are connected to a meter 16 which indicates changes in capacitance of S due to flow of gas through it.
GB3851257A 1957-12-11 1957-12-11 Capacity change detector Expired GB867350A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3851257A GB867350A (en) 1957-12-11 1957-12-11 Capacity change detector
BE573771A BE573771A (en) 1957-12-11 1958-12-10 Capacity change detector.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3851257A GB867350A (en) 1957-12-11 1957-12-11 Capacity change detector

Publications (1)

Publication Number Publication Date
GB867350A true GB867350A (en) 1961-05-03

Family

ID=10403957

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3851257A Expired GB867350A (en) 1957-12-11 1957-12-11 Capacity change detector

Country Status (2)

Country Link
BE (1) BE573771A (en)
GB (1) GB867350A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151029A (en) * 1983-12-07 1985-07-10 Teledyne Ind Air bubble detector device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151029A (en) * 1983-12-07 1985-07-10 Teledyne Ind Air bubble detector device

Also Published As

Publication number Publication date
BE573771A (en) 1959-04-01

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