GB2009427B - Capacitance to frequency conversion means - Google Patents

Capacitance to frequency conversion means

Info

Publication number
GB2009427B
GB2009427B GB7846727A GB7846727A GB2009427B GB 2009427 B GB2009427 B GB 2009427B GB 7846727 A GB7846727 A GB 7846727A GB 7846727 A GB7846727 A GB 7846727A GB 2009427 B GB2009427 B GB 2009427B
Authority
GB
United Kingdom
Prior art keywords
capacitance
frequency conversion
conversion means
frequency
conversion
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
GB7846727A
Other versions
GB2009427A (en
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Priority to GB7846727A priority Critical patent/GB2009427B/en
Publication of GB2009427A publication Critical patent/GB2009427A/en
Application granted granted Critical
Publication of GB2009427B publication Critical patent/GB2009427B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
GB7846727A 1977-12-01 1978-11-30 Capacitance to frequency conversion means Expired GB2009427B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7846727A GB2009427B (en) 1977-12-01 1978-11-30 Capacitance to frequency conversion means

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5020677 1977-12-01
GB7846727A GB2009427B (en) 1977-12-01 1978-11-30 Capacitance to frequency conversion means

Publications (2)

Publication Number Publication Date
GB2009427A GB2009427A (en) 1979-06-13
GB2009427B true GB2009427B (en) 1982-06-09

Family

ID=26266633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7846727A Expired GB2009427B (en) 1977-12-01 1978-11-30 Capacitance to frequency conversion means

Country Status (1)

Country Link
GB (1) GB2009427B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986007155A1 (en) * 1985-05-28 1986-12-04 The Commonwealth Of Australia Care Of The Secretar Two body capacitance measurement instrument remotely connected to probe via transmission channel
GB2190501B (en) * 1986-05-15 1991-01-16 Mc Donnell Douglas Corp Multiplexed junction unit for fuel gaging system and system containing same
US6501284B1 (en) * 2000-08-28 2002-12-31 Stmicroelectronics, Inc. Capacitive finger detection for fingerprint sensor

Also Published As

Publication number Publication date
GB2009427A (en) 1979-06-13

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19981129