EP0500765A1 - Resonanzschwinger. - Google Patents
Resonanzschwinger.Info
- Publication number
- EP0500765A1 EP0500765A1 EP91900029A EP91900029A EP0500765A1 EP 0500765 A1 EP0500765 A1 EP 0500765A1 EP 91900029 A EP91900029 A EP 91900029A EP 91900029 A EP91900029 A EP 91900029A EP 0500765 A1 EP0500765 A1 EP 0500765A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resonance
- oscillator
- container
- piston
- column
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000005260 corrosion Methods 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000013039 cover film Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 239000011149 active material Substances 0.000 claims description 2
- 230000001154 acute effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229920002545 silicone oil Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- -1 Acetylene tetrate Chemical compound 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- RVHSTXJKKZWWDQ-UHFFFAOYSA-N 1,1,1,2-tetrabromoethane Chemical compound BrCC(Br)(Br)Br RVHSTXJKKZWWDQ-UHFFFAOYSA-N 0.000 description 1
- PAAZPARNPHGIKF-UHFFFAOYSA-N 1,2-dibromoethane Chemical compound BrCCBr PAAZPARNPHGIKF-UHFFFAOYSA-N 0.000 description 1
- YTGSYRVSBPFKMQ-UHFFFAOYSA-N 2,2,2-tribromoacetaldehyde Chemical compound BrC(Br)(Br)C=O YTGSYRVSBPFKMQ-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B06B1/0662—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 with an electrode on the sensitive surface
- B06B1/0677—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 with an electrode on the sensitive surface and a high impedance backing
-
- 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
- G10K11/04—Acoustic filters ; Acoustic resonators
Definitions
- the invention relates to a resonance oscillator with an active, e.g. disc-shaped transducer part.
- the value of the inactive material can be taken as the speed of sound v.
- the value v should only be corrected if the slice thickness or the length of the solid body are comparable. An average of v is then used.
- the coupling oscillator thus formed that it only emits greater ultrasonic energy in the resonance range in accordance with its length dimension. Excitation can also take place in corresponding harmonic stages, but with reduced radiated energy.
- a disadvantage of this coupling oscillator is the fact that an inactive solid of certain length dimensions must be provided for each desired resonance frequency that deviates from that of the natural frequency of the active transducer element.
- the object of the invention is to create a resonance oscillator of the type mentioned at the outset, in which the resonance frequency can be changed continuously.
- the resonance oscillator according to the invention in which this object is achieved, is essentially characterized in that the active oscillator part is in contact with a passive oscillator part of comparatively greater length, forming a coupling oscillator, which mainly determines the resonance frequency and consists of a liquid - Or solid column, the length of which can be changed continuously in the direction of the sound vector in order to change the resonance frequency.
- the invention is thus based on the knowledge that a continuous change can be made in a simple manner simply by continuously changing the length of the coupling material
- a prerequisite for a particularly high effectiveness of the inactive oscillator part is the use of a liquid with the greatest possible density J, with high sound velocity v and with the greatest possible sound wave resistance. v.
- the following properties are therefore important: A sound wave resistance _ • v » ⁇ which differs from that of the medium surrounding the resonance oscillator, a sound speed v that is as large as possible v, so that a sufficiently large scope for changing the length is available, and a sound absorption coefficient that is as low as possible, to keep the losses in the coupling medium low.
- the active oscillator part is arranged on the bottom of a resonance container, which is limited by a corrosion-resistant cover plate of high strength and which is as thin as possible and which contains the liquid forming the liquid column, that an axially displaceable piston is assigned to the resonance container. which determines with its position the length of the liquid column of the resonance container and thus the resonance frequency, and that the resonance container with a compensating container for receiving or delivering the liquid displaced from or sucked into the resonance container when the piston is displaced Connection is established.
- the coupling liquid forming the passive oscillating part is always under pressure, namely under the pressure that is outside the counter membrane prevails.
- the required non-positive connection between the active oscillator part, namely the transducer element (PZT) and the liquid forming the passive oscillator part is guaranteed.
- the threshold value of using cavitation is increased.
- a structurally particularly favorable design results if the resonance container and / or the compensating container are cylindrical.
- a particularly simple, trouble-free design is achieved in that the piston is axially displaceable in a cylinder by separating the resonance tank located on its front from the expansion tank located on its rear, that the connection of the resonance tank with the expansion tank in the area of the piston is provided and that the active vibrating part rests against the corrosion-resistant cover plate delimiting the resonance container at its end remote from the piston.
- Fig. 1 is a schematic view of a resonance oscillator designed as a coupling oscillator from a relatively thin active oscillator part and one through
- Solid-state column formed passive oscillator part of comparatively greater length
- Fig. 3 shows a section through a modified embodiment of the resonance oscillator according to the invention.
- FIG. 4 shows a section through a detail of the resonance oscillator according to FIG. 3.
- the resonance oscillator 1 shown in FIG. 1 in the form of a coupling oscillator comprises an active disc-shaped oscillation part 2, namely a PZT transducer element and a passive oscillation part 3 designed in the form of a solid body.
- This coupling oscillator has a resonance frequency, which largely depends on the speed of sound v of the material of the passive oscillating part 3. Only if the thickness of the disk-shaped vibrating part 2 is very small in relation to the length of the passive vibrating part 3 can the resonance frequency be derived practically exclusively from the length of the passive vibrating part 3 with sufficient accuracy.
- the length of the solid body which forms the passive oscillator part 3 corresponds to half the wavelength, i.e. ⁇ A / 2.
- the resonance container 6 shows a resonance oscillator designed according to the invention in the form of a coupling oscillator 4, in which the active oscillation part 2 is embedded in a piston 5 made of insulating material with good HF properties.
- This piston 5, which can be made of Teflon, for example, is slidably mounted within an elongated container, preferably in the form of a cylinder, the bottom of which it forms. He defines the resonance container 6.
- the resonance container 6 On the side opposite the active oscillator part 2, the resonance container 6 has a corrosion-resistant cover plate 7 high strength and small thickness, which should be less than 1/100 of the largest sound wavelength. Titanium is preferably used as the material for this cover plate 7.
- the resonance tank 6 is connected via a lateral tank opening 8 to a likewise preferably cylindrical expansion tank 9.
- This container opening 8 is located in the region of one end of the resonance container 6 remote from the active oscillating part 2.
- the latter is provided with a counter-pressure membrane 10 which is provided at the end of the counter-pressure container 9 remote from the lateral container opening 8.
- the resonance container 6 there is liquid which forms a liquid column 11 which extends between the active oscillating part 2 and the cover plate 7. The length of this liquid column 11 can be changed by axially displacing the piston 5 forming the base.
- Liquid is understood to mean all flowable substances in the broadest sense, regardless of whether they are of inorganic or organic origin or even of a metallic nature, e.g. Mercury. It is only essential that the liquid has a sound wave resistance. v has, which differs from that of the medium outside the resonance container 6. In addition, it must ensure that the sound velocity v is as large as possible, so that there is sufficient scope for changing the length. Finally, the sound absorption coefficient should be low.
- the frequency is limited by the length of the passive oscillator part.
- vibrating parts with lengths corresponding to a multiple of / 2 are also conceivable.
- the resonance body according to the invention is not only as
- Ultrasonic transmitters of selected frequencies can be used successfully. Rather, it can also be used successfully as an ultrasound scanner in the resonance range, i.e. with a narrow bandwidth, for example for locating environmental pollution in seawater and in rivers as well as schools of fish, taking advantage of the fact that the latter emit characteristic frequencies for them and for navigation purposes.
- variable-length solid column 3 has been explained above on the basis of a resonance body with a variable-length liquid column 11, as illustrated in FIG. 2. Instead, it is also possible to implement a variable-length solid column 3 and to use it successfully.
- two-part column training is required.
- the type of separation of the column into the two parts 3 ', 3 is indicated schematically in FIG. 1 by the dashed line 12.
- Each of the two parts has a plane-ground contact surface in accordance with the course of the dashed line 12.
- the plane of the Contact surfaces of both column parts 3 ', 3 "enclose an equally large acute angle with the column axis of the solid column 3.
- the length of the solid column i.e.
- the distance of the one column surface extending transversely to the column axis, which is in contact with the active oscillating part 2, from the column surface of the other column part 3 ', which practically extends parallel thereto, can be changed by moving the two column parts along their contact surfaces.
- FIG. 3 and 4 illustrate an embodiment of a resonance oscillator which is modified compared to FIG. 2.
- the piston 5, which is axially displaceable in a cylinder 12 separates the actual resonance tank 6, which is located on its front side, from the expansion tank 9 located on its rear side, which is used in this embodiment
- REPLACEMENT LEAF takes the place of the laterally connected separate expansion tank of the first embodiment.
- the connection of the resonance tank 6 with the expansion tank 9 is provided in the area of the piston 5.
- the piston 5 is guided at a distance from the cylinder wall in order to form the connection between the resonance container 6 and the compensating container 9.
- the active oscillator part rests on the corrosion-resistant cover plate 7 which delimits the resonance container 6 at its end remote from the piston 5.
- the piston 5 On its front side, the piston 5 has a chamber 13 which is closed off with a cover film 14 opposite the resonance container 6.
- This cover film 14 is formed by a metallic film, preferably made of titanium.
- the active oscillator part 2 which is designed as a composite oscillator, consists of two oscillating disks 16, 17 made of piezoelectrically active material, which bear against one another in opposite directions with their voltage-carrying “hot” side via a common contact connection 15. Furthermore, this figure shows that the cylinder 12 receiving the piston 5 has in the region of its base 18 a bore 20 provided with a sealing sleeve 19 through which the piston rod 21 is guided.
- the piston-cylinder-vibrating part unit is mounted in a housing 22 which is closed to the outside.
- the active oscillator part 2 is suspended in a damped manner with the cover plate 7 resting against it in order to suppress vibration transmission relative to the housing 22.
- a rubber disc can be switched on for this purpose.
- a first decoupling groove 23 is provided between the housing 22 and the piston-cylinder-oscillator part unit.
- SPARE BLADE washers 16, 17 is held in fixed contact with the cover plate by means of an electrically conductive holding plate 24 which corresponds functionally to the electrically conductive cover plate 7.
- the holding disk 24 has a diameter which is larger than the diameter of the disk-shaped active vibrating part in the form of the two vibrating disks 16, 17.
- the cylinder 12 is provided with a flange 25, the diameter of which is greater than the diameter of the Zy ⁇ protrudes 12 and corresponds to the diameter of the holding disc 24.
- the flange 25 of the cylinder 12 is firmly connected to the housing 22 together with the abutting edge 26 of the retaining disk 24.
- flange 25 of the cylinder 12 and the edge 26 of the holding disc 24 are penetrated by a plurality of screw bolts 27 which are passed through bores in the edge region of the cover disc 7.
- a second decoupling groove 28 is provided between the holding plate 24 and the holding plate edge 26 penetrated by the screw bolts 27.
- Fig. 3 shows that the piston rod 21 extends into the space 29 between the cylinder 12 and housing 22.
- a drive mechanism with which the piston rod 21 is coupled is mounted in a manner that is not illustrated in any more detail.
- the position of the piston 5 via the piston rod 21 and thus the resonance frequency can be freely selected in the desired manner.
- the entire electronics for operating the resonance oscillator are also protected from the outside, and the contact connection 15 of the compound oscillator is connected to this electronics via a cable, not shown.
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3937365 | 1989-11-09 | ||
DE3937365 | 1989-11-09 | ||
DE4020881A DE4020881A1 (de) | 1989-11-09 | 1990-06-29 | Resonanzschwinger |
DE4020881 | 1990-06-29 | ||
PCT/EP1990/001882 WO1991007741A2 (de) | 1989-11-09 | 1990-11-09 | Resonanzschwinger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0500765A1 true EP0500765A1 (de) | 1992-09-02 |
EP0500765B1 EP0500765B1 (de) | 1997-03-05 |
Family
ID=25886926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91900029A Expired - Lifetime EP0500765B1 (de) | 1989-11-09 | 1990-11-09 | Resonanzschwinger |
Country Status (7)
Country | Link |
---|---|
US (1) | US5315565A (de) |
EP (1) | EP0500765B1 (de) |
JP (1) | JP3023420B2 (de) |
AT (1) | ATE149726T1 (de) |
DE (2) | DE4020881A1 (de) |
ES (1) | ES2100940T3 (de) |
WO (1) | WO1991007741A2 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19707933C2 (de) * | 1997-02-27 | 2002-09-05 | Ifak Inst Fuer Automation Und | Ultraschallwandler |
GB0000703D0 (en) * | 2000-01-14 | 2000-03-08 | Thomson Marconi Sonar Limited | Frequency tunable projector |
JP3768789B2 (ja) * | 2000-09-07 | 2006-04-19 | アルプス電気株式会社 | 超音波振動子及びウエット処理用ノズル並びにウエット処理装置 |
US8261892B2 (en) * | 2004-03-12 | 2012-09-11 | GM Global Technology Operations LLC | Customizable strut assemblies and articles that employ the same |
US8850893B2 (en) * | 2007-12-05 | 2014-10-07 | Valtion Teknillinen Tutkimuskeskus | Device for measuring pressure, variation in acoustic pressure, a magnetic field, acceleration, vibration, or the composition of a gas |
DE102008040111A1 (de) | 2008-05-16 | 2009-11-19 | Voith Patent Gmbh | Schüttelvorrichtung |
DE102017007280B3 (de) | 2017-07-31 | 2018-09-13 | Apere GmbH & Co. KG | Bioresonanzfrequenz-Signalresonator |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US852647A (en) * | 1907-01-08 | 1907-05-07 | Submarine Signal Co | Submarine signaling. |
FR374934A (fr) * | 1907-02-22 | 1907-06-26 | Lucien Ira Blake | Système et appareil pour la transmission sous-marine des signaux |
US2490452A (en) * | 1946-08-16 | 1949-12-06 | Bell Telephone Labor Inc | Generation of transverse vibrations in liquids |
US3219970A (en) * | 1961-08-30 | 1965-11-23 | Claude C Sims | Underwater sound transducer with resonant gas bubble |
FR1553058A (de) * | 1967-11-28 | 1969-01-10 | ||
US3743446A (en) * | 1971-07-12 | 1973-07-03 | Atek Ind Inc | Standing wave pump |
US4671379A (en) * | 1985-09-03 | 1987-06-09 | Petrophysical Services, Inc. | Method and apparatus for generating seismic waves |
-
1990
- 1990-06-29 DE DE4020881A patent/DE4020881A1/de not_active Withdrawn
- 1990-11-09 DE DE59010665T patent/DE59010665D1/de not_active Expired - Fee Related
- 1990-11-09 US US07/853,760 patent/US5315565A/en not_active Expired - Fee Related
- 1990-11-09 JP JP3500626A patent/JP3023420B2/ja not_active Expired - Fee Related
- 1990-11-09 AT AT91900029T patent/ATE149726T1/de not_active IP Right Cessation
- 1990-11-09 EP EP91900029A patent/EP0500765B1/de not_active Expired - Lifetime
- 1990-11-09 ES ES91900029T patent/ES2100940T3/es not_active Expired - Lifetime
- 1990-11-09 WO PCT/EP1990/001882 patent/WO1991007741A2/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9107741A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP0500765B1 (de) | 1997-03-05 |
WO1991007741A3 (de) | 1991-06-27 |
US5315565A (en) | 1994-05-24 |
DE4020881A1 (de) | 1991-05-16 |
JP3023420B2 (ja) | 2000-03-21 |
ATE149726T1 (de) | 1997-03-15 |
ES2100940T3 (es) | 1997-07-01 |
DE59010665D1 (de) | 1997-04-10 |
WO1991007741A2 (de) | 1991-05-30 |
JPH05508269A (ja) | 1993-11-18 |
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