ZA81876B - Acoustic transducers - Google Patents

Acoustic transducers

Info

Publication number
ZA81876B
ZA81876B ZA00810876A ZA81876A ZA81876B ZA 81876 B ZA81876 B ZA 81876B ZA 00810876 A ZA00810876 A ZA 00810876A ZA 81876 A ZA81876 A ZA 81876A ZA 81876 B ZA81876 B ZA 81876B
Authority
ZA
South Africa
Prior art keywords
vibratable member
coupled
acoustic
sound
air
Prior art date
Application number
ZA00810876A
Inventor
S Panton
Original Assignee
Federal Ind Ind Group Inc
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 Ind Ind Group Inc filed Critical Federal Ind Ind Group Inc
Publication of ZA81876B publication Critical patent/ZA81876B/en

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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

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).
ZA00810876A 1980-04-21 1981-02-10 Acoustic transducers ZA81876B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ZA81876B true ZA81876B (en) 1982-02-24

Family

ID=22498204

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00810876A ZA81876B (en) 1980-04-21 1981-02-10 Acoustic 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)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3602351C1 (en) * 1986-01-27 1986-12-11 Endress + Hauser GmbH + Co., 79689 Maulburg Sound converter system
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
JP2015508960A (en) 2012-01-30 2015-03-23 ピエゾテック・エルエルシー Pulse echo acoustic transducer
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
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

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

Also Published As

Publication number Publication date
MX149462A (en) 1983-11-08
AU6823881A (en) 1981-10-29
CA1136257A (en) 1982-11-23
AU532596B2 (en) 1983-10-06
DE3160140D1 (en) 1983-05-11
EP0039986B1 (en) 1983-04-06
EP0039986A1 (en) 1981-11-18
JPS56165497A (en) 1981-12-19
JPH0134000B2 (en) 1989-07-17
ATE2981T1 (en) 1983-04-15

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