GB1367935A – Capacitive transducer
– Google Patents
GB1367935A – Capacitive transducer
– Google Patents
Capacitive transducer
Info
Publication number
GB1367935A
GB1367935A
GB1720771A
GB1720771A
GB1367935A
GB 1367935 A
GB1367935 A
GB 1367935A
GB 1720771 A
GB1720771 A
GB 1720771A
GB 1720771 A
GB1720771 A
GB 1720771A
GB 1367935 A
GB1367935 A
GB 1367935A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
capacitances
walls
capacitive transducer
capacitance
Prior art date
1971-04-25
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
GB1720771A
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.)
CAPE ENG CO Ltd
Original Assignee
CAPE ENG CO 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.)
1971-04-25
Filing date
1971-04-25
Publication date
1974-09-25
1971-04-25
Application filed by CAPE ENG CO Ltd
filed
Critical
CAPE ENG CO Ltd
1971-04-25
Priority to GB1720771A
priority
Critical
patent/GB1367935A/en
1974-09-25
Publication of GB1367935A
publication
Critical
patent/GB1367935A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms
G—PHYSICS
G01—MEASURING; TESTING
G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
G01L23/12—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by changing capacitance or inductance
G01L23/125—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by changing capacitance or inductance by changing capacitance
G—PHYSICS
G01—MEASURING; TESTING
G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
G—PHYSICS
G01—MEASURING; TESTING
G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
Abstract
1367935 Capacitive transducer CAPE ENG CO Ltd 25 April 1972 [26 May 1971] 17207/71 Heading G1N A capacitive transducer includes a cylinder divided into two substantially equal volumes V 1 , V 2 by a flexible diaphragm 10 of a synthetic plastics material coated on each side with an electrically conducting metal film e.g. aluminium; two opposed walls 11, 12 of the cylinder formed, at least on their inner surfaces, of electrically conducting material whereby a first capacitance is defined between one of the walls and the diaphragm and a second capacitance is defined between the other of the walls and the diaphragm, the first and second capacitances being variable in inverse relation to one another as the diaphragm is displaced from an undistorted rest position and the range of diaphragm displacement being arranged so that the difference between the first and second capacitances is directly proportional to the displacement of the diaphragm. In an alternative embodiment the diaphragm is a sheet of steel. The transducer is applied to the measurement of pressure wherein one of the volumes is maintained at one pressure communicated through a pipe 18 and the other volume at another pressure communicated through a pipe 19. The difference in capacitances may be measured by a circuit as disclosed in Specification 1234467 (see Division G1).
GB1720771A
1971-04-25
1971-04-25
Capacitive transducer
Expired
GB1367935A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1720771A
GB1367935A
(en)
1971-04-25
1971-04-25
Capacitive transducer
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1720771A
GB1367935A
(en)
1971-04-25
1971-04-25
Capacitive transducer
Publications (1)
Publication Number
Publication Date
GB1367935A
true
GB1367935A
(en)
1974-09-25
Family
ID=10091098
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1720771A
Expired
GB1367935A
(en)
1971-04-25
1971-04-25
Capacitive transducer
Country Status (1)
Country
Link
GB
(1)
GB1367935A
(en)
Cited By (12)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2442438A1
(en)
*
1978-11-24
1980-06-20
Vaisala Oy
Aneroid capsule pressure gauge – has central plate between corrugated membranes and distortion is measured by capacitance change
GB2125167A
(en)
*
1982-07-15
1984-02-29
Tekflo Ltd
Electrical fluid pressure transducer diaphragms
DE3523104A1
(en)
*
1985-06-28
1987-01-22
Leybold Heraeus Gmbh & Co Kg
Arrangement having a measuring electrode to which are assigned at fixed distances a first and a second field-generating electrode
FR2610406A1
(en)
*
1987-02-03
1988-08-05
Pierre Bernard
Capacitive pressure sensor
US4951236A
(en)
*
1986-05-05
1990-08-21
Texas Instruments Incorporated
Low cost high precision sensor
US4982351A
(en)
*
1986-05-05
1991-01-01
Texas Instruments Incorporated
Low cost high precision sensor
US5051937A
(en)
*
1986-05-05
1991-09-24
Texas Instruments Incorporated
Low cost high precision sensor
DE29622321U1
(en)
*
1996-12-21
1997-03-06
Medicap Medizintechnik Gmbh
Device for dosed gas supply to users
EP2568271A3
(en)
*
2011-09-12
2014-08-06
Kuhnke Automation GmbH & Co. KG
Pressure sensor and filling level measuring device
CN111449296A
(en)
*
2020-04-22
2020-07-28
深圳市湃科集成技术有限公司
Capacitive airflow sensor and electronic cigarette
CN111449297A
(en)
*
2020-04-22
2020-07-28
深圳市湃科集成技术有限公司
Electron cigarette miaow head and electron cigarette
CN114323355A
(en)
*
2022-03-15
2022-04-12
季华实验室
Pressure measurement system and method for capacitance film gauge and capacitance film gauge
1971
1971-04-25
GB
GB1720771A
patent/GB1367935A/en
not_active
Expired
Cited By (14)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2442438A1
(en)
*
1978-11-24
1980-06-20
Vaisala Oy
Aneroid capsule pressure gauge – has central plate between corrugated membranes and distortion is measured by capacitance change
GB2125167A
(en)
*
1982-07-15
1984-02-29
Tekflo Ltd
Electrical fluid pressure transducer diaphragms
DE3523104A1
(en)
*
1985-06-28
1987-01-22
Leybold Heraeus Gmbh & Co Kg
Arrangement having a measuring electrode to which are assigned at fixed distances a first and a second field-generating electrode
US5051937A
(en)
*
1986-05-05
1991-09-24
Texas Instruments Incorporated
Low cost high precision sensor
US4951236A
(en)
*
1986-05-05
1990-08-21
Texas Instruments Incorporated
Low cost high precision sensor
US4982351A
(en)
*
1986-05-05
1991-01-01
Texas Instruments Incorporated
Low cost high precision sensor
FR2610406A1
(en)
*
1987-02-03
1988-08-05
Pierre Bernard
Capacitive pressure sensor
DE29622321U1
(en)
*
1996-12-21
1997-03-06
Medicap Medizintechnik Gmbh
Device for dosed gas supply to users
EP2568271A3
(en)
*
2011-09-12
2014-08-06
Kuhnke Automation GmbH & Co. KG
Pressure sensor and filling level measuring device
CN111449296A
(en)
*
2020-04-22
2020-07-28
深圳市湃科集成技术有限公司
Capacitive airflow sensor and electronic cigarette
CN111449297A
(en)
*
2020-04-22
2020-07-28
深圳市湃科集成技术有限公司
Electron cigarette miaow head and electron cigarette
CN111449297B
(en)
*
2020-04-22
2023-09-05
深圳市湃科集成技术有限公司
Electronic cigarette miaow head and electronic cigarette
CN114323355A
(en)
*
2022-03-15
2022-04-12
季华实验室
Pressure measurement system and method for capacitance film gauge and capacitance film gauge
CN114323355B
(en)
*
2022-03-15
2022-06-03
季华实验室
Pressure measurement system and method for capacitance film gauge and capacitance film gauge
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Legal Events
Date
Code
Title
Description
1975-02-05
PS
Patent sealed
1979-12-19
PCNP
Patent ceased through non-payment of renewal fee
