AU532596B2 - Improving the coupling and directivity of electroacoustic transducers - Google Patents

Improving the coupling and directivity of electroacoustic transducers

Info

Publication number
AU532596B2
AU532596B2 AU68238/81A AU6823881A AU532596B2 AU 532596 B2 AU532596 B2 AU 532596B2 AU 68238/81 A AU68238/81 A AU 68238/81A AU 6823881 A AU6823881 A AU 6823881A AU 532596 B2 AU532596 B2 AU 532596B2
Authority
AU
Australia
Prior art keywords
vibratable member
coupled
acoustic
sound
air
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
AU68238/81A
Other versions
AU6823881A (en
Inventor
Stanley Panton
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.)
Siemens Canada Ltd
Original Assignee
Federal Industries Industrial Group Inc
Milltronics 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.)
Filing date
Publication date
Application filed by Federal Industries Industrial Group Inc, Milltronics Ltd filed Critical Federal Industries Industrial Group Inc
Publication of AU6823881A publication Critical patent/AU6823881A/en
Application granted granted Critical
Publication of AU532596B2 publication Critical patent/AU532596B2/en
Assigned to MILLTRONICS LTD. reassignment MILLTRONICS LTD. Alteration of Name(s) in Register under S187 Assignors: FEDERAL INDUSTRIES INDUSTRIAL GROUP INC.
Anticipated expiration legal-status Critical
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators

Abstract

A broadly tuned directional acoustic transducer system for transmitting and receiving airborne sound, which provides enhanced efficiency and reduced cost without undue narrowing of bandwidth, makes use of an acoustic transducer element (2) coupled to a vibratable member (10), e.g. a plate, having a higher order flexural mode resonance at approximately the desired frequency of operation, the vibratable member being coupled to the air through low-hysteresis acoustic propagation material having an acoustic impedance much less than that of the vibratable member and much greater than that of the air. The material is disposed so that in the desired direction of propagation there is no substantial reduction of sound intensity in the far field resulting from cancellation occasioned by interaction of sound radiated from adjacent antinodal zones. Preferably the thickness of the material is such that it acts as an efficient acoustic impedance matching transformer. Preferably, the transducer element is piezoelectric and coupled to the centre of a disc-shaped vibratable member (10) to which the coupling material is applied in rings (16, 18, 20).
AU68238/81A 1980-04-21 1981-03-11 Improving the coupling and directivity of electroacoustic transducers Expired AU532596B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14201480A 1980-04-21 1980-04-21
US142014 1980-04-21

Publications (2)

Publication Number Publication Date
AU6823881A AU6823881A (en) 1981-10-29
AU532596B2 true AU532596B2 (en) 1983-10-06

Family

ID=22498204

Family Applications (1)

Application Number Title Priority Date Filing Date
AU68238/81A Expired AU532596B2 (en) 1980-04-21 1981-03-11 Improving the coupling and directivity of electroacoustic transducers

Country Status (8)

Country Link
EP (1) EP0039986B1 (en)
JP (1) JPS56165497A (en)
AT (1) ATE2981T1 (en)
AU (1) AU532596B2 (en)
CA (1) CA1136257A (en)
DE (1) DE3160140D1 (en)
MX (1) MX149462A (en)
ZA (1) ZA81876B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU577721B2 (en) * 1986-01-27 1988-09-29 Endress & Hauser Gmbh & Co. Acoustic transducer system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19601656B4 (en) * 1996-01-18 2009-07-16 Valeo Schalter Und Sensoren Gmbh Steamed ultrasonic transducer
DE19620133C2 (en) * 1996-05-18 2001-09-13 Endress Hauser Gmbh Co Sound or ultrasonic sensor
DE19758243A1 (en) * 1997-12-30 1999-07-15 Endress Hauser Gmbh Co Sound converter system
US8186229B2 (en) * 2010-01-06 2012-05-29 Daniel Measurement And Control, Inc. Ultrasonic flow meter having a port cover assembly
US9050628B2 (en) 2012-01-30 2015-06-09 Piezotech Llc Pulse-echo acoustic transducer
DE102013211619A1 (en) * 2013-06-20 2014-12-24 Robert Bosch Gmbh Environment sensing device with ultrasonic transducer, and motor vehicle with such environment sensing device
DE102013211606A1 (en) * 2013-06-20 2014-12-24 Robert Bosch Gmbh Environment sensing device with ultrasonic transducer, and motor vehicle with such environment sensing device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3218488A (en) * 1961-08-01 1965-11-16 Branson Instr Transducer
JPS437677Y1 (en) * 1965-01-02 1968-04-05
FR1546591A (en) * 1966-08-10 1968-11-22 Univ Ohio State Electro-mechanical transducers
JPS5929816B2 (en) * 1975-08-20 1984-07-23 松下電器産業株式会社 ultrasonic probe
US4078160A (en) * 1977-07-05 1978-03-07 Motorola, Inc. Piezoelectric bimorph or monomorph bender structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU577721B2 (en) * 1986-01-27 1988-09-29 Endress & Hauser Gmbh & Co. Acoustic transducer system

Also Published As

Publication number Publication date
ATE2981T1 (en) 1983-04-15
EP0039986B1 (en) 1983-04-06
DE3160140D1 (en) 1983-05-11
CA1136257A (en) 1982-11-23
AU6823881A (en) 1981-10-29
MX149462A (en) 1983-11-08
JPS56165497A (en) 1981-12-19
ZA81876B (en) 1982-02-24
EP0039986A1 (en) 1981-11-18
JPH0134000B2 (en) 1989-07-17

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Legal Events

Date Code Title Description
MK14 Patent ceased section 143(a) (annual fees not paid) or expired