US3584160A - Method and apparatus for increasing the sound output of an acoustic transducer - Google Patents

Method and apparatus for increasing the sound output of an acoustic transducer Download PDF

Info

Publication number
US3584160A
US3584160A US799630A US3584160DA US3584160A US 3584160 A US3584160 A US 3584160A US 799630 A US799630 A US 799630A US 3584160D A US3584160D A US 3584160DA US 3584160 A US3584160 A US 3584160A
Authority
US
United States
Prior art keywords
plate
openings
vibrating surface
source
frame
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 - Lifetime
Application number
US799630A
Other languages
English (en)
Inventor
Sylvain Jean Janssen
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.)
Compteurs Schlumberger SA
Original Assignee
Compteurs Schlumberger SA
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 Compteurs Schlumberger SA filed Critical Compteurs Schlumberger SA
Application granted granted Critical
Publication of US3584160A publication Critical patent/US3584160A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • Y10S181/00—Acoustics
    • Y10S181/40—Wave coupling

Definitions

  • the present invention relates to a device for increasing the acoustic power radiated in a gas by the solid vibrating surface of a source of sonic and ultrasonic waves, such as an electrostrictive or magnetostrictive acoustic transducer as well as a process for amplifying such acoustic power.
  • acoustic transducers of this type radiate in gases with, generally, a very poor output.
  • the amplitude at the solid-gas interface is retained at the level of the vibrating surface of the transducer, so that slight vibratory amplitudes occur during working without destroying the transducer are then found in the gas.
  • the acoustic power proportional to the acoustic impedance of the medium, that is to say, to the product of the specific mass times the speed of sound in said medium, varies at the solid-gas interface in a ratio of about 1 to l and, consequently, there is only a very slight fraction of power available that is actually utilizable in the gas.
  • the invention has for an object a device appreciably increasing the sound power radiated in a gas so to obtain an increased vibratory amplitude which, for instance, in the air, can easily reach 5, so that the power radiated, proportional to the square of the vibratory amplitude, is thus multiplied by 25.
  • the device is characterized in that it consists of a flat plate, pierced with openings that are at regular distances from each other, and arranged at a very slight distance from the vibrating surface of the acoustic transducer.
  • This device for operating correctly, should be kept at about 0.1 mm. from the vibrating surface with an accuracy of about a one-hundredth of 21 mm.
  • the invention provides a process for its operation so as to keep this positioning, in spite of the vibrations and eventual relative displacements of the transducer which prevents the utilizing of a rigid link between this element and the perforate plate.
  • FIGS. 1 and 2 respectively show a perspective view and a sectional view of a device according to the invention.
  • FIG. 3 shows the device mounted in a support-frame.
  • FIG. 4 shows the complete device in its working position.
  • FIGS. 1 and 2 designate at reference numeral an acoustic transducer of the type described in French Pat. No. 1,429,386 filed Jan. 30, 1965, consisting of a laminated structure of magnetostrictive material and glass.
  • the transducer 10 is provided with an energization winding 11 and supplies, by its vibrating transmitting surface 12, acoustic waves at an ultrasonic frequency of some 10's of Kc./s.
  • Reference numeral 13 designates a flat plate, made of any kind of material, metallic or otherwise, pierced( with openings 14, of circular shape, and evenly distributed.
  • the plate 13 is held at a very slight distance D from the transmitting face 12, and parallel to said face, by means and according to a process which is explained in that which follows.
  • the distance D is, in general, in the region of 0.1 to 0.2 mm.
  • the gas situated between this surface and the regions of the plate 13 distant from one of the openings 14, is alternately compressed and relaxed, the viscosity of the gas thus helping to form a series of small compression chambers 15, shown in outline in FIG. 2.
  • Part of the gas can, however, flow through the openings 14 and there is set up in said openings 14, an alternating movement of the gas at the transducer frequency. Thanks to this alternating flow, all the openings 14 radiate in phase towards the exterior, as shown by the arrows, with a maximum acoustic power.
  • the distance D must be fixed at some hundredths of a mm., for otherwise we shall see a rapid lowering of the vibratory amplitude of the beam radiated by the assembly of openings.
  • these openings need not necessarily be of circular shape, and may be replaced by parallel slots, similar to those of a network, provided that a satisfactory ratio R of the remaining area of the plate in relation to the area of the openings alone, be preserved. It has been seen that this ratio R must be preferably comprised between 3 to l and 5 to l to obtain the maximum amplification effect.
  • the plate 13 required to be positioned parallel to the transmitting surface 12 of the magnetostrictor 10 is suspended in its plane, OYZ vertical for instance, to a vertical frame 16, by means of spiral springs.
  • the springs 17 only have an equilibrium position around the plate 13 of a slight stiffness in the OX horizontal direction in relation to the stiffness supplied by the repulsion force at l /D.
  • the distance D between the plate 13 and the plate 12 varies very slightly with the abscissa A of the plate in relation to the plane of the frame 16 which is kept fixed, and we easily obtain, by acting on the springs 17, the optimal position of the plate with regard to the face 12 which then produces the maximal acoustic energy radiation through the openings 14.
  • the force F being moreover, great with regard to the forces of gravity exerted on the plate, the assembly can be placed in any position, vertical or otherwise, without the relative geometrical arrangement of the two elements being itself altered.
  • a method for increasing the acoustic power radiated in a gas by a solid vibrating surface of a source of sonic and ultrasonic waves by means of a plate provided with a plurality of openings therethrough and resiliently and elastically suspended in a frame surrounding the periphery of said plate comprising moving said frame toward the said vibrating surface of said source so that said plate is parallel to said vibrating surface and continuing such movement until the force exerted by the pressure of the sonic and ultrasonic waves against the plate are balanced by the force exerted by the elastic suspension of the plate in said frame.
  • a device for increasing the acoustic power radiated in a gas by a solid vibrating surface of a source of sonic and ultrasonic waves comprising a plate having parallel sides and provided with a plurality of free openings therethrough, said plurality of openings being regularly spaced and evenly distributed over the entire surface of the plate, and means for resiliently supporting said plate parallel to the vibrating surface of the source of waves, closely spaced therefrom, and at a substantially constant interval therebetween during use.
  • a device as claimed in claim 2 wherein the means for supporting the plate comprises a frame and resilient elastic means connecting opposed sides of said plate to said frame to exert a force in a direction generally perpendicular to the said vibrating surface whereby the force exerted by the pressure of the waves produced by the said vibrating surface of the source against said plate is balanced by said resilient elastic means.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
US799630A 1968-02-27 1969-02-17 Method and apparatus for increasing the sound output of an acoustic transducer Expired - Lifetime US3584160A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR141336 1968-02-27

Publications (1)

Publication Number Publication Date
US3584160A true US3584160A (en) 1971-06-08

Family

ID=8646557

Family Applications (1)

Application Number Title Priority Date Filing Date
US799630A Expired - Lifetime US3584160A (en) 1968-02-27 1969-02-17 Method and apparatus for increasing the sound output of an acoustic transducer

Country Status (3)

Country Link
US (1) US3584160A (enrdf_load_stackoverflow)
DE (1) DE1904417A1 (enrdf_load_stackoverflow)
GB (1) GB1225098A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4619342A (en) * 1979-07-16 1986-10-28 Cerwin-Vega, Inc. Multiple sound transducer system utilizing an acoustic filter to reduce distortion
US4768615A (en) * 1986-01-27 1988-09-06 Endress U. Hauser Gmbh U. Co. Acoustic transducer system
WO1991018486A1 (en) * 1990-05-14 1991-11-28 Commonwealth Scientific And Industrial Research Organisation A coupling device
US5218575A (en) * 1992-09-04 1993-06-08 Milltronics Ltd. Acoustic transducer
US5452267A (en) * 1994-01-27 1995-09-19 Magnetrol International, Inc. Midrange ultrasonic transducer
US6561309B1 (en) * 2000-08-22 2003-05-13 Orbital Technologies Corporation Gas flow generator and apparatus for using the same
US20070263878A1 (en) * 2006-05-12 2007-11-15 Ensky Techonlogy (Shenzhen) Co., Ltd. Sound mask and sound box
US20120271202A1 (en) * 2011-03-23 2012-10-25 Cutera, Inc. Ultrasonic therapy device with diffractive focusing
US10104469B2 (en) 2014-05-01 2018-10-16 Robert Bosch Gmbh Multiple aperture device for low-frequency line arrays
USD883276S1 (en) * 2018-05-31 2020-05-05 Shenzhen Valuelink E-Commerce Co., Ltd. Sound machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2022060A (en) * 1934-08-29 1935-11-26 Bell Telephone Labor Inc Acoustic device
US2567407A (en) * 1948-04-23 1951-09-11 Stromberg Carlson Co Electroacoustic transducer
DE1175277B (de) * 1961-12-02 1964-08-06 Sennheiser Electronic Elektroakustischer Wandler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2022060A (en) * 1934-08-29 1935-11-26 Bell Telephone Labor Inc Acoustic device
US2567407A (en) * 1948-04-23 1951-09-11 Stromberg Carlson Co Electroacoustic transducer
DE1175277B (de) * 1961-12-02 1964-08-06 Sennheiser Electronic Elektroakustischer Wandler

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4619342A (en) * 1979-07-16 1986-10-28 Cerwin-Vega, Inc. Multiple sound transducer system utilizing an acoustic filter to reduce distortion
US4768615A (en) * 1986-01-27 1988-09-06 Endress U. Hauser Gmbh U. Co. Acoustic transducer system
WO1991018486A1 (en) * 1990-05-14 1991-11-28 Commonwealth Scientific And Industrial Research Organisation A coupling device
US5218575A (en) * 1992-09-04 1993-06-08 Milltronics Ltd. Acoustic transducer
US5452267A (en) * 1994-01-27 1995-09-19 Magnetrol International, Inc. Midrange ultrasonic transducer
US6561309B1 (en) * 2000-08-22 2003-05-13 Orbital Technologies Corporation Gas flow generator and apparatus for using the same
US20070263878A1 (en) * 2006-05-12 2007-11-15 Ensky Techonlogy (Shenzhen) Co., Ltd. Sound mask and sound box
US20120271202A1 (en) * 2011-03-23 2012-10-25 Cutera, Inc. Ultrasonic therapy device with diffractive focusing
US10104469B2 (en) 2014-05-01 2018-10-16 Robert Bosch Gmbh Multiple aperture device for low-frequency line arrays
USD883276S1 (en) * 2018-05-31 2020-05-05 Shenzhen Valuelink E-Commerce Co., Ltd. Sound machine

Also Published As

Publication number Publication date
DE1904417A1 (de) 1969-09-11
GB1225098A (enrdf_load_stackoverflow) 1971-03-17

Similar Documents

Publication Publication Date Title
US3584160A (en) Method and apparatus for increasing the sound output of an acoustic transducer
US2498990A (en) Apparatus for driving flexible members
US2815193A (en) Ultrasonic cleaning system
US4757227A (en) Transducer for producing sound of very high intensity
US2406767A (en) Directive transceiver for sound
US2916265A (en) Ultrasonic apparatus
HUP9700904A2 (hu) Hang- vagy ultrahang-érzékelő hang- vagy ultrahanghullámok leadására és/vagy vételére
US2497680A (en) Piezoelectric crystal unit
US3460061A (en) Electroacoustic transducer with improved shock resistance
US3308423A (en) Electroacoustic transducer
US3525071A (en) Electroacoustic transducer
FR2363853B1 (enrdf_load_stackoverflow)
US2833999A (en) Transducer
US4841495A (en) Horn loaded transducer for acoustic levitation
US2406792A (en) Piezoelectric oscillator
US2170178A (en) Vibratory apparatus
US3497731A (en) Bender type transducers
KR102681850B1 (ko) 초음파 발생용 압전 트랜스듀서 조립체
US12226800B2 (en) Acoustic transducer
EP0268633B1 (en) Ultrasonic field generation
US2473354A (en) Device for transmitting and receiving compressional waves
US4085400A (en) Underwater piezoelectric transducers
AU6823881A (en) Improving the coupling and directivity of electroacoustic transducers
US2411541A (en) Acoustic wave generating or receiving apparatus
US3351903A (en) Transducer with pressure release means