WO1996033407A1 - Ultrasonic coupling agent - Google Patents
Ultrasonic coupling agent Download PDFInfo
- Publication number
- WO1996033407A1 WO1996033407A1 PCT/DE1996/000663 DE9600663W WO9633407A1 WO 1996033407 A1 WO1996033407 A1 WO 1996033407A1 DE 9600663 W DE9600663 W DE 9600663W WO 9633407 A1 WO9633407 A1 WO 9633407A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coupling means
- balls
- net
- ultrasonic coupling
- means according
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
-
- 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
Definitions
- the invention relates to an ultrasonic coupling means for filling a gap between a to be examined object and an ultrasonic test head, which is movable relative to the surface of the object, wherein the coupling means comprises a gel to liquid Kon ⁇ consistency.
- Ultrasonic coupling agent should ensure that there are between the probe and the intended object to be examined not un ⁇ inclusions, in particular air bubbles. Air bubbles would significantly change the propagation of sound, air bubbles could simulate errors in the object that actually do not exist.
- the applicant offers a coupling agent of the type mentioned at the outset, which is composed of water, glycol and active ingredients. Coupling agents of the type mentioned at the outset are also known from a brochure from Echo Ultrasound (USA). This offers, for example, the product Ultragel II under the registered trademark. After the sheet is a coupling means high impedance and high viscosity, it is set for critical ultrasound investigation procedure ⁇ , such as aircraft and components of nuclear Anla ⁇ gen. The coupling agent can be easily removed with water, it dries very slowly out.
- a disadvantage of the coupling means of the type mentioned at the outset is that the test head can be moved relative to the surface of the object to be examined .
- Low Especially with coupling means viscosity, game as pasty at ⁇ coupling means is, impedes movement of the probe over the surface often characterized in that the test head from sucking on the surface or does not move with the same force kontinuier ⁇ Lich over a surface.
- pasty coupling agents are often used because they do not distribute themselves over the surface of the object to be examined and are also suitable for use on inclined surfaces, etc.
- the coupling agent contains small balls made from a solid.
- the sliding properties of a test head with respect to a ⁇ be considerably improved to be tested object. It suffice relatively few balls between the test head and the currently investigated surface fibers to the sliding properties markedly verbes ⁇ .
- the balls preferably have a diameter which is smaller than the layer thickness of an applied coupling agent.
- the USAGE ⁇ Deten balls are therefore relatively small. These preferably represent only a minor share of the total weight of the coupling means, their weight proportion is preferably below 20, in particular un ⁇ ter 10%.
- the diameter of the balls is subject to several test conditions adapted, in particular the frequency of the probe used, the roughness of the surface of the object under examination, etc.
- ⁇ head-frequencies in the range 1-4 megahertz have balls in a diameter distribution of 90 to 130 micrometers as low he reported ⁇ .
- diam ⁇ fibers of 50 to 90 microns.
- suitable semi-100 microns for example, of 200 microns in diameter.
- a gel-like or liquid component of the coupling agent are those which are already known, game, as a coupling agent materials used in ⁇ glycol, glycerin, oils, fats, z.
- the balls are well distributed in the coupling means.
- Pasty Koppelmit ⁇ stuffs and coupling means lower viscosity not separate spheres and actual coupling means noticeably.
- ⁇ provide the sufficient wetting and thus a sufficient adhesion between the surface of the balls and the actual coupling means ensure suitable chemical reagents.
- Actual coupling agents which are water-soluble or can be diluted with water are preferably used.
- the coupling agent according to the invention is disposed of by rinsing the coupling agent off the object under investigation, for example with water.
- By strong dilution of the coupling means is achieved that the Glasku ⁇ to rules at the bottom of the receiver can deduct, in another embodiment, they can be collected with a simple filter.
- Metal meshes such as those used for oil filtering, are suitable as filters, but fabric filters, such as are known for example for coffee filters, can also be used.
- the appli ⁇ is dung Field of the invention, the non-destructive testing of materials, in ⁇ testing of steel or light metal parts of play.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96909055A EP0821789A1 (en) | 1995-04-21 | 1996-04-16 | Ultrasonic coupling agent |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995114281 DE19514281A1 (en) | 1995-04-21 | 1995-04-21 | Ultrasonic coupling agent |
DE19514281.0 | 1995-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996033407A1 true WO1996033407A1 (en) | 1996-10-24 |
Family
ID=7759810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/000663 WO1996033407A1 (en) | 1995-04-21 | 1996-04-16 | Ultrasonic coupling agent |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0821789A1 (en) |
DE (1) | DE19514281A1 (en) |
WO (1) | WO1996033407A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4223428A (en) * | 1971-11-24 | 1980-09-23 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for securing a ferroelectric stack to a weighted projection surface |
US4277367A (en) * | 1978-10-23 | 1981-07-07 | Wisconsin Alumni Research Foundation | Phantom material and method |
EP0119855A2 (en) * | 1983-03-17 | 1984-09-26 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic transducers having improved acoustic impedance matching layers |
US5001932A (en) * | 1989-06-22 | 1991-03-26 | General Dynamics Corporation | Ultrasonic squirter |
EP0468627A2 (en) * | 1990-07-24 | 1992-01-29 | British Gas plc | Method for bonding together hollow glass spheres |
EP0640564A1 (en) * | 1993-08-19 | 1995-03-01 | Siemens Aktiengesellschaft | Process for the preparation of a hydrophobic aerogel |
-
1995
- 1995-04-21 DE DE1995114281 patent/DE19514281A1/en not_active Withdrawn
-
1996
- 1996-04-16 WO PCT/DE1996/000663 patent/WO1996033407A1/en not_active Application Discontinuation
- 1996-04-16 EP EP96909055A patent/EP0821789A1/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4223428A (en) * | 1971-11-24 | 1980-09-23 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for securing a ferroelectric stack to a weighted projection surface |
US4277367A (en) * | 1978-10-23 | 1981-07-07 | Wisconsin Alumni Research Foundation | Phantom material and method |
EP0119855A2 (en) * | 1983-03-17 | 1984-09-26 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic transducers having improved acoustic impedance matching layers |
US5001932A (en) * | 1989-06-22 | 1991-03-26 | General Dynamics Corporation | Ultrasonic squirter |
EP0468627A2 (en) * | 1990-07-24 | 1992-01-29 | British Gas plc | Method for bonding together hollow glass spheres |
EP0640564A1 (en) * | 1993-08-19 | 1995-03-01 | Siemens Aktiengesellschaft | Process for the preparation of a hydrophobic aerogel |
Also Published As
Publication number | Publication date |
---|---|
EP0821789A1 (en) | 1998-02-04 |
DE19514281A1 (en) | 1996-10-24 |
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