NL175761B - Piezo-electrische ontvanginrichting voor drukgolven met een continue structuur. - Google Patents

Piezo-electrische ontvanginrichting voor drukgolven met een continue structuur.

Info

Publication number
NL175761B
NL175761B NLAANVRAGE7209465,A NL7209465A NL175761B NL 175761 B NL175761 B NL 175761B NL 7209465 A NL7209465 A NL 7209465A NL 175761 B NL175761 B NL 175761B
Authority
NL
Netherlands
Prior art keywords
pressure waves
continuous structure
electrical receiver
piezo electrical
piezo
Prior art date
Application number
NLAANVRAGE7209465,A
Other languages
English (en)
Other versions
NL175761C (nl
NL7209465A (nl
Original Assignee
Inst Francais Du Petrole
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 Inst Francais Du Petrole filed Critical Inst Francais Du Petrole
Publication of NL7209465A publication Critical patent/NL7209465A/xx
Publication of NL175761B publication Critical patent/NL175761B/nl
Application granted granted Critical
Publication of NL175761C publication Critical patent/NL175761C/nl

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/20—Arrangements of receiving elements, e.g. geophone pattern
    • G01V1/201—Constructional details of seismic cables, e.g. streamers
    • G01V1/208—Constructional details of seismic cables, e.g. streamers having a continuous structure
    • 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
    • G01L23/10—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 pressure-sensitive members of the piezoelectric type
    • 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
    • G01L9/08—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 piezoelectric devices, i.e. electric circuits therefor
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • H10N30/302—Sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/60—Piezoelectric or electrostrictive devices having a coaxial cable structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/80—Piezoelectric polymers, e.g. PVDF

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
NLAANVRAGE7209465,A 1971-07-08 1972-07-07 Piezo-electrische ontvanginrichting voor drukgolven met een continue structuur. NL175761C (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7125137A FR2145099A5 (nl) 1971-07-08 1971-07-08

Publications (3)

Publication Number Publication Date
NL7209465A NL7209465A (nl) 1973-01-10
NL175761B true NL175761B (nl) 1984-07-16
NL175761C NL175761C (nl) 1984-12-17

Family

ID=9080082

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7209465,A NL175761C (nl) 1971-07-08 1972-07-07 Piezo-electrische ontvanginrichting voor drukgolven met een continue structuur.

Country Status (13)

Country Link
US (1) US3798474A (nl)
JP (1) JPS5441233B1 (nl)
BE (1) BE785462A (nl)
CA (1) CA1001292A (nl)
DE (1) DE2233579C2 (nl)
DK (1) DK138919C (nl)
FR (1) FR2145099A5 (nl)
GB (1) GB1354865A (nl)
IT (1) IT962500B (nl)
NL (1) NL175761C (nl)
NO (1) NO134088C (nl)
SE (1) SE391584B (nl)
SU (1) SU535028A3 (nl)

Families Citing this family (92)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2233615B1 (nl) * 1973-06-12 1977-05-06 Gen Dynamics Corp
US3987405A (en) * 1973-12-11 1976-10-19 Institut Francais Du Petrole, Des Carburants Et Lubrifiants Et Entreprise De Recherches Et D'activities Petrolieres Elf Receiver of continuous structure for seismic prospecting
FR2271733B1 (nl) * 1974-05-17 1979-08-03 Inst Francais Du Petrole
GB1515287A (en) * 1974-05-30 1978-06-21 Plessey Co Ltd Piezoelectric transducers
FR2298787A1 (fr) * 1975-01-22 1976-08-20 Minnesota Mining & Mfg Dispositif de detection piezo-electrique
NL7502453A (nl) * 1975-03-03 1976-09-07 Philips Nv Inrichting voor het omzetten van elektrische in akoestische trillingen en omgekeerd, voorzien van een membraan, bevattende tenminste een laag piezo-elektrisch polymeer materiaal.
FR2320536A1 (fr) * 1975-08-08 1977-03-04 Sv Sarl Metro Mesures Piezographe et procede de mise en oeuvre pour l'analyse du fonctionnement d'un moteur diesel
US4089927A (en) * 1975-09-26 1978-05-16 Minnesota Mining And Manufacturing Company Strain sensor employing bi layer piezoelectric polymer
US4183010A (en) * 1975-12-08 1980-01-08 Gte Sylvania Incorporated Pressure compensating coaxial line hydrophone and method
GB1544856A (en) * 1976-12-09 1979-04-25 Marconi Co Ltd Pressure sensitive detectors
AT375466B (de) * 1977-07-27 1984-08-10 List Hans Messwertaufnehmer mit einem piezoelektrischen messelement
FR2409654B1 (fr) * 1977-11-17 1985-10-04 Thomson Csf Dispositif transducteur piezoelectrique et son procede de fabrication
US4194194A (en) * 1978-01-30 1980-03-18 The United States Of America As Represented By The Secretary Of The Navy Piezoelectric vibration detector for sensing a nearby intruder
US4166229A (en) * 1978-02-23 1979-08-28 The United States Of America As Represented By The Secretary Of The Navy Piezoelectric polymer membrane stress gage
US4376302A (en) * 1978-04-13 1983-03-08 The United States Of America As Represented By The Secretary Of The Navy Piezoelectric polymer hydrophone
US4322877A (en) * 1978-09-20 1982-04-06 Minnesota Mining And Manufacturing Company Method of making piezoelectric polymeric acoustic transducer
JPS5562494A (en) * 1978-11-05 1980-05-10 Ngk Spark Plug Co Pieozoelectric converter for electric string instrument
JPS5825450B2 (ja) * 1978-11-15 1983-05-27 三菱油化株式会社 生体用トランスジユ−サ
CA1137210A (en) * 1979-04-26 1982-12-07 Francis S. Foster Ultrasonic imaging method and device using one transducer having a line focus aligned with another transducer
DE2927269C2 (de) * 1979-07-05 1982-10-28 Siemens AG, 1000 Berlin und 8000 München Piezoelektrisches Antriebselement für Schreibdüsen in Tintenmosaikschreibeinrichtungen
US4275658A (en) * 1979-10-12 1981-06-30 The United States Of America As Represented By The Secretary Of The Army Safing and arming signature for fuzes
FR2475804A1 (fr) * 1980-02-12 1981-08-14 Lewiner Jacques Perfectionnements aux nappes composites constitutives de transducteurs electromecaniques et aux transducteurs equipes de telles nappes
US4350917A (en) * 1980-06-09 1982-09-21 Riverside Research Institute Frequency-controlled scanning of ultrasonic beams
EP0057982B1 (en) * 1981-02-06 1985-12-11 EMI Limited Device sensitive to pressure waves
FR2507424A1 (fr) * 1981-06-05 1982-12-10 Cgr Transducteur piezoelectrique autocollant et dispositif de mise en oeuvre du transducteur
GB2123602B (en) * 1982-07-06 1987-02-25 Raytheon Co Piezo electric transducer and method of making same
US4771772A (en) * 1982-08-09 1988-09-20 Medtronic, Inc. Robotic implantable medical device and/or component restoration system
US4628928A (en) * 1982-08-09 1986-12-16 Medtronic, Inc. Robotic implantable medical device and/or component restoration system
US4799202A (en) * 1982-09-27 1989-01-17 The United States Of America As Represented By The Secretary Of The Navy Complementary interferometric hydrophone
GB8325861D0 (en) * 1983-09-28 1983-11-02 Syrinx Presicion Instr Ltd Force transducer
US4499394A (en) * 1983-10-21 1985-02-12 Koal Jan G Polymer piezoelectric sensor of animal foot pressure
US4629925A (en) * 1983-11-22 1986-12-16 Raychem Corporation Piezoelectric coaxial cable
WO1986000757A1 (en) * 1984-07-06 1986-01-30 Raychem Corporation Piezoelectric coaxial cable
US4609845A (en) * 1984-07-06 1986-09-02 Raychem Corporation Stretched piezoelectric polymer coaxial cable
CA1267216C (en) * 1984-07-06 1990-03-27 PIEZOELECTRIC DEVICE
GB2166871A (en) * 1984-09-03 1986-05-14 Vickers Plc Respiration monitor
US4568851A (en) * 1984-09-11 1986-02-04 Raychem Corporation Piezoelectric coaxial cable having a helical inner conductor
US4695988A (en) * 1984-09-12 1987-09-22 Ngk Spark Plug Co. Ltd. Underwater piezoelectric arrangement
US4585970A (en) * 1985-03-11 1986-04-29 Koal Jan G Flexible piezoelectric switch
GB8524237D0 (en) * 1985-10-02 1985-11-06 Raychem Gmbh Pressure sensor
US4761005A (en) * 1985-10-10 1988-08-02 Barry J. French Sports scoring device including a flexible prezoelectric layer resilient layer
US4824107A (en) * 1985-10-10 1989-04-25 French Barry J Sports scoring device including a piezoelectric transducer
JPS63502152A (ja) * 1985-12-05 1988-08-18 フォーカス・リミテッド 圧力センサ−用支持部材
CA1284210C (en) * 1985-12-05 1991-05-14 Richard John Penneck Acoustic transducer
JPS62165500A (ja) * 1985-12-19 1987-07-22 アメリカン　テレフオン　アンド　テレグラフ　カムパニ− 電気機械変換器と使用法
US5024872A (en) * 1986-02-27 1991-06-18 Raytheon Company Sheets of stretched and polarized polymer materials and method of manufacturer
FR2600424B1 (fr) * 1986-06-23 1989-02-17 Inst Francais Du Petrole Procede et dispositif pour ameliorer la sensibilite et le rapport du signal au bruit de transducteurs piezo-electriques comportant une pluralite de capteurs combines en parallele
FR2601132B1 (fr) * 1986-07-04 1989-03-24 Inst Francais Du Petrole Dispositif capteur d'ondes de pression du type piezo-electrique a structure continue et procede pour sa fabrication
FR2603422B1 (fr) * 1986-08-27 1988-12-30 Inst Francais Du Petrole Procede pour realiser des capteurs piezo-electriques continus de sensibilite accrue et capteurs realises suivant le procede
GB8625686D0 (en) * 1986-10-27 1986-11-26 Ministry Of Agriculture Fisher Assessing processing strains
US4797863A (en) * 1986-12-22 1989-01-10 Honeywell, Inc. Underwater acoustical transducer
FR2617659B1 (fr) * 1987-06-30 1990-09-14 Inst Francais Du Petrole Transducteur piezo-electrique comportant plusieurs elements sensibles coaxiaux
US4841494A (en) * 1987-07-03 1989-06-20 Ngk Spark Plug Co., Ltd. Underwater piezoelectric arrangement
US4876675A (en) * 1987-09-12 1989-10-24 Ngk Spark Plug Co., Ltd. Towed piezoelectric cable
FR2625640B1 (fr) * 1987-12-30 1990-06-22 Inst Francais Du Petrole Capteur piezo-electrique tubulaire a grande sensibilite
FR2634088B1 (fr) * 1988-07-11 1991-05-31 Inst Francais Du Petrole Capteur piezo-electrique comportant au moins une paire d'elements sensibles souples de grande longueur
US4954811A (en) * 1988-11-29 1990-09-04 Pennwalt Corporation Penetration sensor
US5448232A (en) * 1989-05-03 1995-09-05 Mitron Systems Corporation Roadway sensors and method of installing same
US5500635A (en) * 1990-02-20 1996-03-19 Mott; Jonathan C. Products incorporating piezoelectric material
US5361240A (en) * 1990-07-10 1994-11-01 Innovative Transducers Inc. Acoustic sensor
US5554907A (en) * 1992-05-08 1996-09-10 Mitron Systems Corporation Vehicle speed measurement apparatus
US5486820A (en) * 1992-12-18 1996-01-23 The Whitaker Corporation Traffic sensor having piezoelectric sensors which distinguish lanes
US5680718A (en) * 1994-12-20 1997-10-28 First Choice Trading Limited Illuminable hat
ATE243842T1 (de) 1995-11-22 2003-07-15 Snap On Equipment Ltd Analyse von rotierenden maschinen
US5883857A (en) * 1996-11-07 1999-03-16 Innovative Transducers Incorporated Non-liquid filled streamer cable with a novel hydrophone
US6108267A (en) * 1996-11-07 2000-08-22 Innovative Transducers, Inc. Non-liquid filled streamer cable with a novel hydrophone
US6012822A (en) * 1996-11-26 2000-01-11 Robinson; William J. Motion activated apparel flasher
US6713944B2 (en) * 2002-01-02 2004-03-30 Omron Corporation Actuator and method of manufacturing a strain element
EP1507040A1 (de) * 2003-08-13 2005-02-16 Heimbach GmbH & Co. Textilerzeugnis mit einem integrierten Sensor zur Messung von Druck und Temperatur
GB0320168D0 (en) * 2003-08-28 2003-10-01 Univ Manchester A sensing device
US20050127677A1 (en) * 2003-12-03 2005-06-16 Luttrull Jeffrey K. Roadway generating electrical power by incorporating piezoelectric materials
US7180227B2 (en) * 2004-01-16 2007-02-20 Taiwan Semiconductor Manufacturing Co., Ltd. Piezoelectric o-ring transducer
DE102007010145A1 (de) * 2007-02-28 2008-09-11 W.E.T Automotive Systems Aktiengesellschaft Elektrischer Leiter
US7629727B2 (en) * 2007-12-20 2009-12-08 Honda Motor Co., Ltd. Scalable tubular mechanical energy harvesting device
US7902722B2 (en) * 2008-04-03 2011-03-08 Dvx, Llc Transducer apparatus for intravascular blood flow measurement
US20100288181A1 (en) * 2008-09-29 2010-11-18 Gas Technology Institute Impact sensing multi-layered plastic material
US20100078090A1 (en) * 2008-09-29 2010-04-01 Gas Technology Institute Impact sensing multi-layered plastic material
BR112012005842A8 (pt) * 2009-09-17 2018-06-26 Quantum Tech Sciences Inc Qtsi método para fazer uma classificação de identidade associado a uma fonte de dados, sistema de sensibilidade responsivo a sinais acústicos ou sísmicos, método para identificar sinais sísmicos ou acústicos de interesse que se originam de veículos de movimento motorizados, método para identificar sinais sísmicos ou acústicos de interesse que se originam do movimento de passos, e, método para identificar sinais sísmicos ou acústicos de interesse que se originam de maquinário fixo ou de movimento
CN102551725A (zh) * 2010-12-27 2012-07-11 深圳市迈迪加科技发展有限公司 一种新型呼吸传感器
CN102525432A (zh) * 2010-12-29 2012-07-04 深圳市迈迪加科技发展有限公司 一种心脏功能传感器
CN102551706A (zh) * 2010-12-31 2012-07-11 深圳市迈迪加科技发展有限公司 一种胎音传感器
JP6283812B2 (ja) * 2015-05-29 2018-02-28 株式会社エスオラボ 荷重測定装置および荷重測定センサ
US11428845B2 (en) * 2015-11-04 2022-08-30 Quantum Technology Sciences, Inc. System and method for sensing seismic acoustic signals
WO2017126986A1 (ru) * 2016-01-19 2017-07-27 Алексей Михайлович КОРОЛЕВ Инерциальное устройство создания изображений
WO2017212523A1 (ja) 2016-06-06 2017-12-14 株式会社村田製作所 菌対策用圧電糸、菌対策用布、布、衣料、医療部材、生体作用圧電糸、および物質吸着用圧電糸
CN108495961B (zh) * 2016-11-01 2021-03-26 株式会社村田制作所 抗菌性非织造部件、抗菌性无纺布、和抗菌性缓冲材料
US11367827B2 (en) * 2017-04-20 2022-06-21 Mitsui Chemicals, Inc. Piezoelectric substrate, force sensor, and actuator
US11616190B2 (en) 2017-12-22 2023-03-28 B&L Sensor Technologies, Llc Device and method for sensing underwater sound pressure
WO2020041403A1 (en) * 2018-08-22 2020-02-27 Georgia Tech Research Corporation Flexible sensing interface systems and methods
RU2717263C1 (ru) * 2019-06-13 2020-03-19 Федеральное Государственное Унитарное Предприятие "Всероссийский Научно-Исследовательский Институт Автоматики Им.Н.Л.Духова" (Фгуп "Внииа") Устройство для измерения инфразвуковых колебаний среды
GB202103374D0 (en) * 2021-03-11 2021-04-28 Thales Holdings Uk Plc An acoustic sensor
CN115598647A (zh) * 2022-12-13 2023-01-13 三微电子科技（苏州）有限公司（Cn） 一种薄膜压电声压传感器和探测成像装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434143A (en) * 1943-04-17 1948-01-06 Chilowsky Constantin Supersonic signal transmitter and receiver
US2420864A (en) * 1943-04-17 1947-05-20 Chilowsky Constantin Piezoelectric plastic material and method of making same
US2649579A (en) * 1950-02-01 1953-08-18 Standard Oil Dev Co Detector for seismic exploration
US3070775A (en) * 1959-10-16 1962-12-25 Jr Daniel E Andrews Electroacoustic piezoelectricpaste transducer
DE1230576B (de) * 1964-03-19 1966-12-15 Prakla Gmbh Zylindrischer magnetostriktiver Schallempfaenger
FR91705E (fr) * 1965-05-22 1968-08-02 Inst Francais Du Petrole Capteurs de pression insensibles aux bruits parasites
US3325780A (en) * 1965-10-21 1967-06-13 John J Horan Flexural transducers
DE1548376A1 (de) * 1966-02-12 1970-05-21 Prakla Gmbh Hydrophon fuer seismische Seemessungen
US3336573A (en) * 1966-09-14 1967-08-15 Texaco Inc Crystal pressure sensitive geophones for use in soft earth
DE1967130C2 (de) * 1968-01-25 1982-04-01 Pioneer Electronic Corp., Tokyo Mechanisch-elektrisch bzw. elektrisch-mechanischer Wandler
US3604958A (en) * 1970-05-14 1971-09-14 U S Research Corp Sensing transducer

Also Published As

Publication number Publication date
GB1354865A (en) 1974-06-05
SU535028A3 (ru) 1976-11-05
DK138919C (da) 1979-04-30
FR2145099A5 (nl) 1973-02-16
NO134088B (nl) 1976-05-03
DE2233579A1 (de) 1973-01-25
CA1001292A (fr) 1976-12-07
NL175761C (nl) 1984-12-17
SE391584B (sv) 1977-02-21
NL7209465A (nl) 1973-01-10
NO134088C (nl) 1976-08-18
BE785462A (fr) 1972-12-27
DK138919B (da) 1978-11-13
IT962500B (it) 1973-12-20
DE2233579C2 (de) 1983-06-16
JPS5441233B1 (nl) 1979-12-07
US3798474A (en) 1974-03-19

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