GB1524981A - Capacitance transducers - Google Patents

Capacitance transducers

Info

Publication number
GB1524981A
GB1524981A GB496475A GB496475A GB1524981A GB 1524981 A GB1524981 A GB 1524981A GB 496475 A GB496475 A GB 496475A GB 496475 A GB496475 A GB 496475A GB 1524981 A GB1524981 A GB 1524981A
Authority
GB
United Kingdom
Prior art keywords
conductor
cable
sheath
tubular
tubular conductor
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
GB496475A
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 GB496475A priority Critical patent/GB1524981A/en
Publication of GB1524981A publication Critical patent/GB1524981A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones
    • 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
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0005—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means 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

1524981 Microphones UNITED KINGDOM ATOMIC ENERGY AUTHORITY 3 Feb 1976 [5 Feb 1975 3 Sept 1975] 4964/75 and 36226/75 Heading H4J A capacitance transducer, such as a microphone, comprises a prepared end (Fig. 4 of Cognate 4964/75) of metal sheathed mineral insulated cable. The prepared end comprises a flattened intermediate region of the cable, the region housing a tubular conductor 5 which forms an extension to one end of a solid conductor 2 of the cable, the tubular conductor being electrically insulated from the sheath 3 with mineral insulation 1 and the end of the cable being closed. In producing the transducer, the insulation 1 and conductor 2 are drilled out (Fig. I of Cognate 4964/75) from one end of a 3 mm. diameter stainless steel M.I. cable to a depth of approx. 25 mm. A centring tube (T) is used to guide the drill (D) and thereby prevent sheath damage. Further insulation 1 is removed by a tubular reamer to expose approx 5 mm. conductor 2 and a tubular conductor 5 is threaded on and crimped to the conductor 2. The tubular conductor 5 is also necked circumferentially so that it can be subsequently snapped off at a point 4 mm. from the open end of the sheath. Next the annulus bounded by tubular conductor 5 and sheath 3 is filled with magnesium oxide and consolidated with a tube. When the filling has reached the necked portion of tubular conductor 5 the outer end of the tubular conductor 5 is snapped off. The end of the cable is next pressed flat between brass blocks 8, having radiused corners 9, to flatten the sheath 3 and conductor 5. The end of the cable is filled with insulation, the assembly is dried out at approx. 200‹C. and the end is helium purged. A plug 10 is inserted at the sheath tip and the assembly is leak tested. In an alternative arrangement, Fig. 1 of Cognate 36226/75 a similar process is carried out with an M.I. cable having twin conductors 2, but the exposed ends of the conductors 2 are twisted together and a tubular conductor 5 is threaded on to the twisted ends 2. The twisted ends of the conductor provide a thermocouple hot junction 11 and the device also acts as a microphone. A temperature measuring instrument 17 (Fig. 2) is connected to the two leads 2 via a connection box 13 and the sheath 3 and one of the conductors 2a are connected to a microphone charge amplifier 14 by leads 15.
GB496475A 1975-02-05 1975-02-05 Capacitance transducers Expired GB1524981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB496475A GB1524981A (en) 1975-02-05 1975-02-05 Capacitance transducers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB496475A GB1524981A (en) 1975-02-05 1975-02-05 Capacitance transducers
GB3622675 1975-09-03

Publications (1)

Publication Number Publication Date
GB1524981A true GB1524981A (en) 1978-09-13

Family

ID=26239491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB496475A Expired GB1524981A (en) 1975-02-05 1975-02-05 Capacitance transducers

Country Status (1)

Country Link
GB (1) GB1524981A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015047586A1 (en) * 2013-09-27 2015-04-02 Rosemount Inc. Pressure sensor with mineral insulated cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015047586A1 (en) * 2013-09-27 2015-04-02 Rosemount Inc. Pressure sensor with mineral insulated cable
US20150090040A1 (en) * 2013-09-27 2015-04-02 Rosemount Inc. Pressure sensor with mineral insulated cable
RU2636272C2 (en) * 2013-09-27 2017-11-21 Роузмаунт Инк. Pressure sensor with mineral-insulated cable
US10260980B2 (en) 2013-09-27 2019-04-16 Rosemount Inc. Pressure sensor with mineral insulated cable

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee