US3786407A - Acoustic transducer for deep sea - Google Patents

Acoustic transducer for deep sea Download PDF

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Publication number
US3786407A
US3786407A US00239102A US3786407DA US3786407A US 3786407 A US3786407 A US 3786407A US 00239102 A US00239102 A US 00239102A US 3786407D A US3786407D A US 3786407DA US 3786407 A US3786407 A US 3786407A
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US
United States
Prior art keywords
acoustic transducer
resonant cavity
passage
pipe
opening
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
US00239102A
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English (en)
Inventor
S Bando
O Baba
H Ogawa
M Yamamoto
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.)
Furuno Electric Co Ltd
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Furuno Electric Co Ltd
Kawasaki Heavy Industries 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 Furuno Electric Co Ltd, Kawasaki Heavy Industries Ltd filed Critical Furuno Electric Co Ltd
Application granted granted Critical
Publication of US3786407A publication Critical patent/US3786407A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

Definitions

  • This invention relates to a deep sea acoustic transducer and more specifically to a novel and improved transducer including a piezoelectric ceramic element.
  • prior cylindrical ceramic vibrators or transducers used in shallow depths have had structures in which the unnecessary radiating surface, such as the inner face of the cylinder, is covered with sponge rubber or cork ⁇ rubber including a number of discrete foams as an acoustic shielding material and were en- Y closed in a rubber casing filled with castor oil.
  • one object of this invention resides in the provision of an acoustic transducer for deep seas which does not lose its acoustic sensitivity at high water presunnecessary radiating surface of the element includes said water pressure chamberand said resonance cavity.
  • FIG. I(A) - is a cross-sectional plan view taken along the line A-A of FIG. 1(8) of an embodiment of an acoustic transducer according to this invention
  • FIG. 1(B) is aside view in partial section of the embodiment of FIG. I(A), and
  • FIG. 2 is a characteristic diagram representing sensitivity of the transducer according to this invention.
  • the acoustic transducer of this invention comprises a static water pressurechamber I and a resonant cavity 20 which are arranged coaxially with each other and cooperate to serve the function of a muffler for the inner surface of the ⁇ vibratoror element l.
  • Vibrator 1 is operated in a conventional manner by electrodes 11 and l2 applied to opposing surfaces and connected to lead 13.
  • the static water pressure chamber I0 is comprised of a hol low, ⁇ cylindrical ceramic vibrator 1 and a pair of circular discs 2 and 3 closing both ends thereof.
  • the upper disc 2 hasta communication hole 5 bored in the center and the communication hole 5 is concentrically aligned with the inner end of a pipe 4 coupled to the upper disc 2.1.0nthe upperdisc 2 and around the pipe 4 is a cylindrical.resonance cavity 2l) coaxially aligned with the pipe 4 ⁇ and the water pressure chamber 10 and formed by a cylindrical side wall 6 and an upper wall 7.
  • the interior of the pipe 4 is connected through a plurality of small holes 8 formed in the pipe wall to the resonance cavity 20.
  • the transducer of this invention can withstand a water pressure substantially up to the mechanical compressive strength of the ceramic vibrator itself, which is about 800 lrg/cm2 and corresponds to the water pressure at a depth of 8000 meters.
  • n number of the small holes 8.
  • This equation is represented on a graph as shown in FIG. 2 by plotting f/f, on the abscissa and LR on the ordinate with reference to GV as a parameter.
  • the attenuation is remarkably increased when f equals f,. or the resonance cavity resonates with the sound. This means that a great improvement of reception sensitivity at a specific frequency band that is, a socalled filter effect can be obtained by appropriately selecting the geometries of various components.
  • the vibrator can be driven at a high water pressure without reduction of sensitivity in accordance with this invention as heretofore described, it becomes possible to provide a supersonic transducer which is highly suitable for searching in deep seas.
  • the structure may be arranged to shield acoustically the surfaces of a vibrator in lateral vibration other than its radiating surface and to provide a pressure balance between the interior and exterior portions of the shield casing.
  • An acoustic transducer comprising a ceramic vibrator which has an unnecessary radiating surface, said transducer further including an enclosure for enclosing said unnecessary radiating surface to form a static water pressure chamber therein, a first passage in the form of a tubular member extending from and communicating with the interior of said chamber and open to the fluid surrounding said chamber, a resonant cavity y adjacent said tubular member, and at least one second passage communicating with the interior of said tubular member by means of an opening therein and with said i resonant cavity.
  • An acoustic transducer including a hollow cylindricall ceramic vibrator and wherein said enclosure consists of a pair of circular discs closing both the ends of said cylinder, said rst passage is composed of a pipe coupled to an opening formed in the center of one of said pair of discs, said resonant cavity is cylindrical and disposed coaxially about said pipe and said second passage is a hole formed in the wall of said pipe and opening into said resonant cavity.
  • ABSTRACT This invention relates to novel methods and apparatus for making offshore geophysical surveys with a low power seismic source.
  • a first vessel which is provided with air guns or the like, is anchored at a predetermined location, while a second vessel tows a streamer cable along a preselected course past the rst vessel.
  • the second vessel transmits command signals to cause the air guns on the first vessel to be fired at appropriate intervals, whereby a sequence of seismic pulses is refracted along acommon path Von the course, and Y,
  • each of these pulses is detected by succeeding receiver stations of the cable. All of the pulses detected at a common surface point are gathered for each of the various common surface points along the course, and are then stacked to provide a single pulse of greatly improved signal-to-noise ratio for each common surface point.
  • the stacked signals may then be arranged to provide a refraction profile of the course, in order to define traps and the like in subterranean earth formations.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
US00239102A 1971-04-14 1972-03-29 Acoustic transducer for deep sea Expired - Lifetime US3786407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2310771A JPS53699B1 (enExample) 1971-04-14 1971-04-14

Publications (1)

Publication Number Publication Date
US3786407A true US3786407A (en) 1974-01-15

Family

ID=12101230

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239102A Expired - Lifetime US3786407A (en) 1971-04-14 1972-03-29 Acoustic transducer for deep sea

Country Status (6)

Country Link
US (1) US3786407A (enExample)
JP (1) JPS53699B1 (enExample)
DE (1) DE2215849C3 (enExample)
FR (1) FR2133622B1 (enExample)
GB (1) GB1334216A (enExample)
NO (1) NO129765B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140064035A1 (en) * 2011-05-09 2014-03-06 Ultra Electronics Maritime Systems Inc. Acoustic projector having synchronized acoustic radiators
USD807260S1 (en) * 2016-04-11 2018-01-09 Christopher Mark Young Brake conversion hub

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101949732B (zh) * 2010-08-13 2011-11-09 浙江大学 用于深水声波探测的谐振腔式水听器
GB2508206B (en) * 2012-11-23 2017-06-28 Thales Holdings Uk Plc A transducer for a locator beacon and an underwater locator beacon

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429104A (en) * 1943-03-27 1947-10-14 Rca Corp Signal translating apparatus
US2787671A (en) * 1952-10-06 1957-04-02 Schall Technik Dr Ing Karl Sch Microphone arrangement
US3281769A (en) * 1963-06-20 1966-10-25 Honeywell Inc Transducer apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429104A (en) * 1943-03-27 1947-10-14 Rca Corp Signal translating apparatus
US2787671A (en) * 1952-10-06 1957-04-02 Schall Technik Dr Ing Karl Sch Microphone arrangement
US3281769A (en) * 1963-06-20 1966-10-25 Honeywell Inc Transducer apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140064035A1 (en) * 2011-05-09 2014-03-06 Ultra Electronics Maritime Systems Inc. Acoustic projector having synchronized acoustic radiators
US9275629B2 (en) * 2011-05-09 2016-03-01 Ultra Electronics Maritime Systems Inc. Acoustic projector having synchronized acoustic radiators
USD807260S1 (en) * 2016-04-11 2018-01-09 Christopher Mark Young Brake conversion hub

Also Published As

Publication number Publication date
JPS53699B1 (enExample) 1978-01-11
DE2215849B2 (de) 1974-02-21
DE2215849A1 (de) 1972-11-09
DE2215849C3 (de) 1974-09-26
FR2133622A1 (enExample) 1972-12-01
GB1334216A (en) 1973-10-17
NO129765B (enExample) 1974-05-20
FR2133622B1 (enExample) 1974-07-05

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