ES2010039A6 - An acoustic emission transducer and an electrical oscillator - Google Patents

An acoustic emission transducer and an electrical oscillator

Info

Publication number
ES2010039A6
ES2010039A6 ES8803682A ES8803682A ES2010039A6 ES 2010039 A6 ES2010039 A6 ES 2010039A6 ES 8803682 A ES8803682 A ES 8803682A ES 8803682 A ES8803682 A ES 8803682A ES 2010039 A6 ES2010039 A6 ES 2010039A6
Authority
ES
Spain
Prior art keywords
acoustic emission
disc
piezoceramic
emission transducer
resonance
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
ES8803682A
Other languages
Spanish (es)
Inventor
Trevor James Holroyd
Michael Sadler
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce 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 Rolls Royce PLC filed Critical Rolls Royce PLC
Publication of ES2010039A6 publication Critical patent/ES2010039A6/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
    • H03H9/176—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of ceramic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0603—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a piezoelectric bender, e.g. bimorph
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0651—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of circular shape
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
    • H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
    • H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
    • H03H9/173—Air-gaps
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
    • H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
    • H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
    • H03H9/174—Membranes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R17/08—Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Abstract

A problem with prior art acoustic emission transducers is that for operation at lower frequencies, i.e. for resonance at 40-60KHz, the size of the piezoceramic element has to be relatively large to obtain a resonance of the acoustic emission waves within the piezoceramic element. This requires the use of relatively expensive and difficult or complex manufacturing processes. An acoustic emission transducer assembly (40) as provided by the invention can be used at the relatively low frequencies desired, is relatively small and is cheap and easy to manufacture. The acoustic emission transducer assembly (40) comprises a brass base disc (42), a piezoceramic disc (44) and a brass case (46). The base disc (42) and the piezoceramic disc (44) are arranged coaxially, and the annular peripheral region (54) only of the piezoceramic disc (44) is mounted on an annular projection (48) which extends axially from the base disc (42). The annular projection (48) is provided with apertures (52) to prevent compressions in a chamber (56) damping vibrations of the piezoceramic disc (44). An electrical oscillator assembly is also provided by the same construction.
ES8803682A 1987-12-05 1988-12-02 An acoustic emission transducer and an electrical oscillator Expired ES2010039A6 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878728509A GB8728509D0 (en) 1987-12-05 1987-12-05 Acoustic emission transducer

Publications (1)

Publication Number Publication Date
ES2010039A6 true ES2010039A6 (en) 1989-10-16

Family

ID=10628074

Family Applications (2)

Application Number Title Priority Date Filing Date
ES8803682A Expired ES2010039A6 (en) 1987-12-05 1988-12-02 An acoustic emission transducer and an electrical oscillator
ES888803681A Expired ES2010038A6 (en) 1987-12-05 1988-12-02 An acoustic emission transducer and an electrical oscillator

Family Applications After (1)

Application Number Title Priority Date Filing Date
ES888803681A Expired ES2010038A6 (en) 1987-12-05 1988-12-02 An acoustic emission transducer and an electrical oscillator

Country Status (5)

Country Link
CN (2) CN1033503A (en)
AU (2) AU2726288A (en)
ES (2) ES2010039A6 (en)
GB (1) GB8728509D0 (en)
WO (2) WO1989005445A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68905913T2 (en) * 1988-12-23 1993-09-30 Mitsubishi Electric Corp Accelerometer.
US5849694A (en) * 1990-07-16 1998-12-15 Synenki; Richard M. Stable and bioactive modified porcine somatotropin and pharmaceutical compositions thereof
GB2282297B (en) * 1993-09-23 1998-03-11 Holroyd Instr Ltd Improved resonant acoustic emission transducer
DE69507770T2 (en) * 1994-11-04 1999-09-02 Sagem Piezoelectric vibration sensor
JPH10294995A (en) * 1997-04-21 1998-11-04 Matsushita Electric Ind Co Ltd Dripproof ultrasonic wave transmitter
JP4810661B2 (en) * 2006-04-27 2011-11-09 国立大学法人埼玉大学 Electromechanical transducer and method for manufacturing the same
KR20090117402A (en) 2008-05-09 2009-11-12 한국지질자원연구원 Measuring apparatus with ae sensor for predicting failure, method for installing the same and measuring apparatus set with ae sensor for predicting failure
EP2365390A3 (en) 2010-03-12 2017-10-04 ASML Netherlands B.V. Lithographic apparatus and method
CN105705255B (en) * 2013-11-04 2019-02-15 皇家飞利浦有限公司 The high-volume of unit piece ultrasonic transducer manufactures
DE102015216163A1 (en) * 2015-08-25 2017-03-02 Robert Bosch Gmbh Acoustic sensor for emitting and / or receiving acoustic signals
CN108981896A (en) * 2018-07-12 2018-12-11 清诚声发射研究（广州）有限公司 A kind of acoustic emission sensor
CN112153543B (en) * 2020-09-07 2022-03-18 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) Half-space radiation high-frequency broadband transducer
WO2022193005A1 (en) * 2021-03-15 2022-09-22 Resonant Acoustics International Inc. Apodizing backing structures for ultrasonic transducers and related methods

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110924A (en) * 1979-02-20 1980-08-27 Murata Mfg Co Ltd Integrated construction type vibration detecter
JPS5667731A (en) * 1979-11-06 1981-06-08 Nissan Motor Co Ltd Knocking sensor
FR2498405A1 (en) * 1981-01-16 1982-07-23 Thomson Csf Dynamic pressure sensor, esp. hydrophone - using thin layer of piezoelectric zinc oxide on semiconductor substrate
JPS59158611A (en) * 1983-03-01 1984-09-08 Matsushita Electric Ind Co Ltd Crystal oscillating unit
GB2174537A (en) * 1985-04-30 1986-11-05 Stc Plc Crystal oscillator

Also Published As

Publication number Publication date
WO1989005445A1 (en) 1989-06-15
AU2781689A (en) 1989-07-05
GB8728509D0 (en) 1988-01-13
CN1033503A (en) 1989-06-21
CN1033729A (en) 1989-07-05
ES2010038A6 (en) 1989-10-16
WO1989005199A1 (en) 1989-06-15
AU2726288A (en) 1989-07-05

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19901203