CA2231248A1 - Method and apparatus for structural analysis and/or for detecting the position of stratified objects - Google Patents
Method and apparatus for structural analysis and/or for detecting the position of stratified objects Download PDFInfo
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- CA2231248A1 CA2231248A1 CA002231248A CA2231248A CA2231248A1 CA 2231248 A1 CA2231248 A1 CA 2231248A1 CA 002231248 A CA002231248 A CA 002231248A CA 2231248 A CA2231248 A CA 2231248A CA 2231248 A1 CA2231248 A1 CA 2231248A1
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- 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
- G01N29/24—Probes
- G01N29/2487—Directing probes, e.g. angle probes
-
- 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
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
-
- 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
- G01N29/24—Probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0426—Bulk waves, e.g. quartz crystal microbalance, torsional waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/263—Surfaces
- G01N2291/2632—Surfaces flat
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Acoustics & Sound (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention relates to a method and a device for the analysis of surface structures and near-surface patterns of objects and/or for detecting the position of objects using ultrasound waves with an ultrasound transmitter, an ultrasound receiver and a plate used as a support surface for the object. The aim of the invention is a method and a device enabling compact wave course and a flat and, possibly, even a compact and small embodiment. In the method according to the invention the waves scattered back and/or reflected from the object are conveyed along the plate and fed to transducers for analysis. The device suitable for carrying out the method comprises a plate, suitable for conveying one-dimensional or two-dimensional waves, and a receiver, or a receiver and transmitter are arranged at the side of said plate.
Description
~ ~ CA 02231248 1998-03-05 .
METHOD AND APPARATUS FOR STRUCTURAL ANALYSIS AND/OR
FOR DETECTING THE POSITION OF STRATIFIED OBJECTS
The invention relates to an apparatus for structural analysis and/or position detection of stratified objects by means of ultrasonic waves, with one or more ultrasonic generators and ultrasonic receivers, as well as a support surface for the object.
Devices analyzing the structure of stratified objects by means of ultrasound are already known, such as for instance from the EP 0 262 186. The known devices are based on the principle of reflection tomography. This principle applied to fingerprints according to the mentioned European Patent was presented at the Conference of Acoustical Imaging in Florence in 1995 and published in the respective Proceedings under the title" Ultrasonic setup for fingerprint pattern detection and evaluation".
In the known references, the object placed on a support plate is subjected to ultrasound waves coming from a generator arranged oppositely thereto in a liquid filled housing. Either several generators and several receivers MODIFIED PAGE IPEA/EP
/ ' CA 02231248 1998-03-0 are arranged on the housing wall opposite to the support surface, or the generator and also the receiver are movable on a carrier along a trajectory. This way the finger tip or any other object on any point of the support plate can be detected. The waves reflected and back-scattered by the object are received by a receiver which transmits the information about the intensity and/or the phase of backscattering and reflection to a computer for analysis and recording, optionally via an amplifier, a timing device, possibly also a detector.
The ultrasonic waves to which the finger or other objects are exposed are bulk waves originating from the generator/generators in the same manner as the backscattered and reflected sound waves, which are in the range of 2 MEIz and above.
The production of devices of the known kind has proven to be complicated, namely particularly because the housing is filled with liquid. This requires the housing to be perfectly sealed off and the arrangement of the transducers in the liquid is also fraught with problems. Furthermore due to the liquid-filled housing and the use of bulk waves, MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 these devices are also relatively large, since a certain size of the device can not be reduced. They also do not allow for a large size of the support plate, which makes impossible the analysis of objects with a large surface, e.g. human hands.
Further devices used purely for position detection have become known. Such a contact sensor is described in the abstract of JP-A-2 195 289. The latter consists of a tube serving as a wave guide, at whose open end an ultrasound transducer serving a sender, respectively receiver, to which a transmitting and time-measuring circuit, as well as a distance calculator are connected.
Depending on the m~ch~nical pressure on the wave guide, the reflection of the ultrasonic wave is determined and therewith the pressure point is calculated. A structural analysis can not be performed with the device of the aforementioned application.
There are also other known device which detect the position of an object, such as the position of a finger on surface, e.g. a display (see also EP O 557 446 and 0 523 200). However these devices are not capable to analyze the MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 structure of the object, e. g. the finger, since they have a much too low resolution and also because they are not intended for this purpose. Also their modus operandi is different, since these devices use only the attenuation of the ultrasonic waves which are generated by the object, which in principle can not give information about the structure.
The object of the invention consists in proposing a method and an apparatus for the analysis of surface structures, as well as of the areas close to the surface and/or the position of objects, which permit a more compact wave pattern and ma]ce possible a flatter and more compact construction. Constructively the device should require less technical effort for equal analysis results.
This object is achieved due to the characteristic features defined in claims 1 and 2.
Surprisingly it has been established in tests that also ultrasonic waves guided in this manner can deliver clear and reproducible analyses of the structure and/or the position of the objects. Thereby one starts with a plate MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 of any desired dimensions, as defined in claim 2, with laterally arranged senders or senders and receivers. One sender or receiver can also be arranged underneath the plate. According to the invention the exposure to sonic waves takes place with shear waves (SH-waves)i.e. waves which are horizontally polarized. As material for the plate glass, metal or crystal with a low degree of absorption are proposed. Of course it is also possible to provide transducers on the plate sides, which at the same time are senders and receivers, since also in the case of ultrasonic waves generated and/or received laterally with respect to the support plate, guided along the plate surface, a reproducible and strong reflection and/or scattering takes place at the structure adjoining the plate surface.
At least one surface of the plate forms the limit which guides the wave two-dimensionally. Thereby it does not matter whether a guided or a normal wave is generated, but the wave reflected and/or backscattered by the object will be two-dimensionally guided by the limit or limits.
The plate can also be equipped with one or two MODIFIED PAGE IPEA/EP
channels, whereby a unidimensional wave is obtained and, at the end of the channel, directed towards a receiver. The channels are feasible by changing the plate structure, e.g.
the thickness. They can also be formed by using different types of adjoining materials, namely in a manner similar to optical wave guides, wherein the core of the guide and the envelope surrounding the core can consist of different materials.
The thickness of the plate equals 1/3 to 3 mm and depends on the wave length. Namely it has been found that the most favorable measurements for the plate thickness lie within a range which is 5 - 10 bigger than the wave length of the generated ultrasonic waves. If channels are provided in the plate, their diameter has also to be kept 5 to 10 times bigger than the wave length of the used ultrasonic waves. Furthermore the unidimensional guidance has the advantage that the signals arrive one after another and are also detected in this succession. It is also possible to use thicker plates.
Compared to the known devices, the device of the invention offers the advantage of a flat construction with ~ODIFIED PAGE IPEA/EP
reproducible and accurate analysis data. In addition the construction is considerably simplified, since the liquid-filled housing can be eliminated. The propagation of the ultrasonic waves is guaranteed within the plate-shaped solid body, so that additional steps become superfluous.
This fact makes also possible the use of small devices, e.g. of the size of a key. Furthermore it is possible to produce also devices with large ~i -n~ions, which can analyze the structure of the object, as well as its position, which can be advantageous for instance for the control of computers, similar as in the known contact fields (touch panels)and the detection of larger objects, e. g. the whole hand.
Further details of the invention can be seen from the attached drawing. Thereby show:
Fig. 1 a lateral view of the device in a schematic representation, Fig. 2 a top view of the embodiment shown in Fig. 1, Fig. 3 the arrangement of a plate consisting of MODIFIED PAGE IPEA/EP
uni~; ?n~ional wave guides, Fig. 4 the channel path through a plate, Fig. S the spiral-shaped arrangement of two channels in a plate.
In the represented example Fig. 1 shows a round plate 1 with transducers 3 arranged on the rim and a transducer 2 arranged underneath the plate. In the embodiment shown in Fig. 2 in a top view, it can be seen that transducers 4 and 5 are arranged all around the plate. The transducers can function as senders, as well as receivers. The optional bottom transducer 2 can not be seen in Fig. 2.
In this device schematically represented in Fig. 1 and 2, shear waves in the ultrasonic range are used, which propagate in the plate (the solid body) along one or also both borders.
Consequently these are guided waves, i.e. of the type which can not spread in all dimensions. In the plate of the embodiment examples of Fig. 1 and 2, two-dimensional MODIFIED PAGE IPEA/EP
waves are produced, while plates with channels of any origin, as for instance in Fig. 3, 4 and 5, show waves with unidimensional spreading.
Similar to the known devices using bulk waves, the electric signals are transmitted from the receiving transducer, via an amplifier, and possibly a detector with the assistance of a analog/digital converter to a computer which, based on that, delivers the information about the structure and/or the position of the analyzed stratum.
The method of analysis used in the case of two-~; -n~ional waves corresponds to the one used in the previously mentioned bulk-waves devices, e.g. the radon transformation. Furthermore the version with channels offers a simpler possibility, because it is only necessary to summarize the signal, respectively signals which correspond to the channel path.
Naturally these methods are only then necessary, when it is desired to reproduce the image of the e~ ;ned layer.
For other purposes it is also possible to use other signal processing methods, e.g. a simple signal comparison, other ~ODIFIED PAGE IPEA/EP
types of transformation, etc.
Moreover the flat solution of the device according to the invention offers a simple possibility of structure detection and of the therewith connected position detection, since the plate also allows for a unidimensional wave guidance. The advantage of an analysis with uni~; ?~cional wave guidance consists in that it makes line sc~nn~ng possible.
For producing unidimensional waves, as shown in Fig. 3 the plate has channels 6 running parallelly next to each other, whose lateral walls are connected with neighboring channels. At their ends the channels 6 have transducers, which send in se~uence and transform the received ultrasonic waves into signals.
In Fig. 4 a channel 8 is shown which covers the entire surface of a plate 9 and which transmit to the transducer 10 the information of the object exposed to the ultrasonic waves.
Fig. 5 shows two parallel channels 11 and 12, which MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 follow an angular-spiral path and receive the backscattered ultrasonic waves directing them to the transducers 13 and 14, which further transmit to the computer the signals resulting therefromO
The represented shapes of the channel path are indicated only as examples, because each path shape is suited to transmit unimodally the backscattered waves to a transducer.
MODIFIED PAGE IPEA/EP
METHOD AND APPARATUS FOR STRUCTURAL ANALYSIS AND/OR
FOR DETECTING THE POSITION OF STRATIFIED OBJECTS
The invention relates to an apparatus for structural analysis and/or position detection of stratified objects by means of ultrasonic waves, with one or more ultrasonic generators and ultrasonic receivers, as well as a support surface for the object.
Devices analyzing the structure of stratified objects by means of ultrasound are already known, such as for instance from the EP 0 262 186. The known devices are based on the principle of reflection tomography. This principle applied to fingerprints according to the mentioned European Patent was presented at the Conference of Acoustical Imaging in Florence in 1995 and published in the respective Proceedings under the title" Ultrasonic setup for fingerprint pattern detection and evaluation".
In the known references, the object placed on a support plate is subjected to ultrasound waves coming from a generator arranged oppositely thereto in a liquid filled housing. Either several generators and several receivers MODIFIED PAGE IPEA/EP
/ ' CA 02231248 1998-03-0 are arranged on the housing wall opposite to the support surface, or the generator and also the receiver are movable on a carrier along a trajectory. This way the finger tip or any other object on any point of the support plate can be detected. The waves reflected and back-scattered by the object are received by a receiver which transmits the information about the intensity and/or the phase of backscattering and reflection to a computer for analysis and recording, optionally via an amplifier, a timing device, possibly also a detector.
The ultrasonic waves to which the finger or other objects are exposed are bulk waves originating from the generator/generators in the same manner as the backscattered and reflected sound waves, which are in the range of 2 MEIz and above.
The production of devices of the known kind has proven to be complicated, namely particularly because the housing is filled with liquid. This requires the housing to be perfectly sealed off and the arrangement of the transducers in the liquid is also fraught with problems. Furthermore due to the liquid-filled housing and the use of bulk waves, MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 these devices are also relatively large, since a certain size of the device can not be reduced. They also do not allow for a large size of the support plate, which makes impossible the analysis of objects with a large surface, e.g. human hands.
Further devices used purely for position detection have become known. Such a contact sensor is described in the abstract of JP-A-2 195 289. The latter consists of a tube serving as a wave guide, at whose open end an ultrasound transducer serving a sender, respectively receiver, to which a transmitting and time-measuring circuit, as well as a distance calculator are connected.
Depending on the m~ch~nical pressure on the wave guide, the reflection of the ultrasonic wave is determined and therewith the pressure point is calculated. A structural analysis can not be performed with the device of the aforementioned application.
There are also other known device which detect the position of an object, such as the position of a finger on surface, e.g. a display (see also EP O 557 446 and 0 523 200). However these devices are not capable to analyze the MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 structure of the object, e. g. the finger, since they have a much too low resolution and also because they are not intended for this purpose. Also their modus operandi is different, since these devices use only the attenuation of the ultrasonic waves which are generated by the object, which in principle can not give information about the structure.
The object of the invention consists in proposing a method and an apparatus for the analysis of surface structures, as well as of the areas close to the surface and/or the position of objects, which permit a more compact wave pattern and ma]ce possible a flatter and more compact construction. Constructively the device should require less technical effort for equal analysis results.
This object is achieved due to the characteristic features defined in claims 1 and 2.
Surprisingly it has been established in tests that also ultrasonic waves guided in this manner can deliver clear and reproducible analyses of the structure and/or the position of the objects. Thereby one starts with a plate MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 of any desired dimensions, as defined in claim 2, with laterally arranged senders or senders and receivers. One sender or receiver can also be arranged underneath the plate. According to the invention the exposure to sonic waves takes place with shear waves (SH-waves)i.e. waves which are horizontally polarized. As material for the plate glass, metal or crystal with a low degree of absorption are proposed. Of course it is also possible to provide transducers on the plate sides, which at the same time are senders and receivers, since also in the case of ultrasonic waves generated and/or received laterally with respect to the support plate, guided along the plate surface, a reproducible and strong reflection and/or scattering takes place at the structure adjoining the plate surface.
At least one surface of the plate forms the limit which guides the wave two-dimensionally. Thereby it does not matter whether a guided or a normal wave is generated, but the wave reflected and/or backscattered by the object will be two-dimensionally guided by the limit or limits.
The plate can also be equipped with one or two MODIFIED PAGE IPEA/EP
channels, whereby a unidimensional wave is obtained and, at the end of the channel, directed towards a receiver. The channels are feasible by changing the plate structure, e.g.
the thickness. They can also be formed by using different types of adjoining materials, namely in a manner similar to optical wave guides, wherein the core of the guide and the envelope surrounding the core can consist of different materials.
The thickness of the plate equals 1/3 to 3 mm and depends on the wave length. Namely it has been found that the most favorable measurements for the plate thickness lie within a range which is 5 - 10 bigger than the wave length of the generated ultrasonic waves. If channels are provided in the plate, their diameter has also to be kept 5 to 10 times bigger than the wave length of the used ultrasonic waves. Furthermore the unidimensional guidance has the advantage that the signals arrive one after another and are also detected in this succession. It is also possible to use thicker plates.
Compared to the known devices, the device of the invention offers the advantage of a flat construction with ~ODIFIED PAGE IPEA/EP
reproducible and accurate analysis data. In addition the construction is considerably simplified, since the liquid-filled housing can be eliminated. The propagation of the ultrasonic waves is guaranteed within the plate-shaped solid body, so that additional steps become superfluous.
This fact makes also possible the use of small devices, e.g. of the size of a key. Furthermore it is possible to produce also devices with large ~i -n~ions, which can analyze the structure of the object, as well as its position, which can be advantageous for instance for the control of computers, similar as in the known contact fields (touch panels)and the detection of larger objects, e. g. the whole hand.
Further details of the invention can be seen from the attached drawing. Thereby show:
Fig. 1 a lateral view of the device in a schematic representation, Fig. 2 a top view of the embodiment shown in Fig. 1, Fig. 3 the arrangement of a plate consisting of MODIFIED PAGE IPEA/EP
uni~; ?n~ional wave guides, Fig. 4 the channel path through a plate, Fig. S the spiral-shaped arrangement of two channels in a plate.
In the represented example Fig. 1 shows a round plate 1 with transducers 3 arranged on the rim and a transducer 2 arranged underneath the plate. In the embodiment shown in Fig. 2 in a top view, it can be seen that transducers 4 and 5 are arranged all around the plate. The transducers can function as senders, as well as receivers. The optional bottom transducer 2 can not be seen in Fig. 2.
In this device schematically represented in Fig. 1 and 2, shear waves in the ultrasonic range are used, which propagate in the plate (the solid body) along one or also both borders.
Consequently these are guided waves, i.e. of the type which can not spread in all dimensions. In the plate of the embodiment examples of Fig. 1 and 2, two-dimensional MODIFIED PAGE IPEA/EP
waves are produced, while plates with channels of any origin, as for instance in Fig. 3, 4 and 5, show waves with unidimensional spreading.
Similar to the known devices using bulk waves, the electric signals are transmitted from the receiving transducer, via an amplifier, and possibly a detector with the assistance of a analog/digital converter to a computer which, based on that, delivers the information about the structure and/or the position of the analyzed stratum.
The method of analysis used in the case of two-~; -n~ional waves corresponds to the one used in the previously mentioned bulk-waves devices, e.g. the radon transformation. Furthermore the version with channels offers a simpler possibility, because it is only necessary to summarize the signal, respectively signals which correspond to the channel path.
Naturally these methods are only then necessary, when it is desired to reproduce the image of the e~ ;ned layer.
For other purposes it is also possible to use other signal processing methods, e.g. a simple signal comparison, other ~ODIFIED PAGE IPEA/EP
types of transformation, etc.
Moreover the flat solution of the device according to the invention offers a simple possibility of structure detection and of the therewith connected position detection, since the plate also allows for a unidimensional wave guidance. The advantage of an analysis with uni~; ?~cional wave guidance consists in that it makes line sc~nn~ng possible.
For producing unidimensional waves, as shown in Fig. 3 the plate has channels 6 running parallelly next to each other, whose lateral walls are connected with neighboring channels. At their ends the channels 6 have transducers, which send in se~uence and transform the received ultrasonic waves into signals.
In Fig. 4 a channel 8 is shown which covers the entire surface of a plate 9 and which transmit to the transducer 10 the information of the object exposed to the ultrasonic waves.
Fig. 5 shows two parallel channels 11 and 12, which MODIFIED PAGE IPEA/EP
CA 0223l248 l998-03-0 follow an angular-spiral path and receive the backscattered ultrasonic waves directing them to the transducers 13 and 14, which further transmit to the computer the signals resulting therefromO
The represented shapes of the channel path are indicated only as examples, because each path shape is suited to transmit unimodally the backscattered waves to a transducer.
MODIFIED PAGE IPEA/EP
Claims (17)
1. Method for analyzing surface structures and structures close to the surface of objects and/or for the position detection of object by means of ultrasonic waves, with an ultrasonic wave sender and an ultrasonic wave receiver, as well as a plate serving as a support surface for the object, characterized in that the object resting on the plate is exposed to horizontally polarized ultrasonic waves, so-called shear waves (SH-waves), whereby the waves reflected and/or backscattered from the object are guided along the solid body and transmitted for analysis to the transducers (3, 4, 5).
2. Device for implementing the method according to claim 1, characterized in that a plate-shaped solid body (1) suited for the guidance of unidimensional or two-dimensional waves is used as support surface, to which laterally arranged ultrasonic wave senders (4, 5) for generating shear waves and receivers (3) for their reception are assigned, whereby the sending and receiving can be carried out by a transducer.
3. Device according to claim 2, characterised in that the plate-shaped solid body (1) consists of different metals or crystals with low absorption.
4. Device according to claim 2, characterised in that for the guidance of waves reflected and/or backscattered at the object wave guides (6, 8, 11, 12) are provided in the plate (1) and/or form same plate (1).
5. Device according to claim 4, characterised in that as waveguides a channel (8) or several channels (6, 11, 12) are provided.
6. Device according to claim 5, characterised in that the channels are produced by changing the plate structure (thickness).
7. Device according to claim 5, characterized in that the channels are formed of two materials.
8. Device according to claim 2, characterized in that the channel consists of a conductor whose core is made from a different material than its envelope.
9. Device according to claim 2, characterised in that the receiver (3) is arranged laterally on the plate (1), but that the sender (2) is arranged underneath the plate.
10. Device according to claim 2, characterised in that the thickness of the plate depends on the wave length of the ultrasonic wave.
11. Device according to one more or the preceding claims, characterised in that several channels (6) arranged next to each other are provided in the plate or form the same, having receivers (7) at their ends, which are scanned successively.
12. Device according to one or more of the preceding claims, characterized in that the channel or the channels (11, 12) are wound as angular spirals or round spirals.
13. Device according to claim 12, characterized in that these windings are divided into two channels.
14. Device according to one or more of the preceding claims characterised in that the channel (8) is wound back and forth, whereby the channel parts run parallelly to each other.
15. Device according to claim 1, characterised in that the plate is curved.
16. Device according to claim 4, characterised in that the diameter of the waveguide or the channels is 5-10 times bigger than the wave length of the ultrasonic waves.
17. Device according to one or more of the preceding claims, characterised in that the electrical signals from the receiving transducers are transmitted via a detector and/or an analog/digital converter to a computer for further processing, which delivers the information about the position and/or structure of the analyzed layer of the object by using a radon transformation and/or scanning.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19533007 | 1995-09-07 | ||
| DE19636124.9 | 1996-09-06 | ||
| DE19533007.2 | 1996-09-06 | ||
| DE19636124A DE19636124A1 (en) | 1995-09-07 | 1996-09-06 | Method and device for structure analysis and / or for position detection of layered objects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2231248A1 true CA2231248A1 (en) | 1997-03-13 |
Family
ID=26018364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002231248A Abandoned CA2231248A1 (en) | 1995-09-07 | 1996-09-06 | Method and apparatus for structural analysis and/or for detecting the position of stratified objects |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0850019B1 (en) |
| JP (1) | JPH11512182A (en) |
| KR (1) | KR100558140B1 (en) |
| AT (1) | ATE182450T1 (en) |
| CA (1) | CA2231248A1 (en) |
| DE (2) | DE19636124A1 (en) |
| DK (1) | DK0850019T3 (en) |
| ES (1) | ES2138834T3 (en) |
| PL (1) | PL184551B1 (en) |
| WO (1) | WO1997008990A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10112034A1 (en) * | 2001-03-14 | 2002-10-02 | Sonem Gmbh | Arrangement for image reproduction for computer tomographs with ultrasound |
| DE10352774A1 (en) * | 2003-11-12 | 2005-06-23 | Infineon Technologies Ag | Location arrangement, in particular Losboxen localization system, license plate unit and method for location |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0179327B1 (en) * | 1984-10-17 | 1988-12-28 | Siemens Aktiengesellschaft | Sensor system for the ultrasonic investigation of the position and/or contour of an object |
| JPH02195289A (en) * | 1989-01-25 | 1990-08-01 | Matsushita Electric Ind Co Ltd | Ultrasonic contact sensor and autonomous type moving robot equipped therewith |
| US5162618A (en) * | 1990-11-16 | 1992-11-10 | Exzec, Inc. | Acoustic touch position sensor with first order lamb wave reflective arrays |
-
1996
- 1996-09-06 WO PCT/EP1996/003916 patent/WO1997008990A1/en active IP Right Grant
- 1996-09-06 JP JP9510872A patent/JPH11512182A/en active Pending
- 1996-09-06 DE DE19636124A patent/DE19636124A1/en not_active Withdrawn
- 1996-09-06 DE DE59602565T patent/DE59602565D1/en not_active Expired - Fee Related
- 1996-09-06 AT AT96931776T patent/ATE182450T1/en not_active IP Right Cessation
- 1996-09-06 EP EP96931776A patent/EP0850019B1/en not_active Expired - Lifetime
- 1996-09-06 KR KR1019980701715A patent/KR100558140B1/en not_active IP Right Cessation
- 1996-09-06 ES ES96931776T patent/ES2138834T3/en not_active Expired - Lifetime
- 1996-09-06 PL PL96325340A patent/PL184551B1/en not_active IP Right Cessation
- 1996-09-06 DK DK96931776T patent/DK0850019T3/en active
- 1996-09-06 CA CA002231248A patent/CA2231248A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE59602565D1 (en) | 1999-09-02 |
| PL184551B1 (en) | 2002-11-29 |
| DK0850019T3 (en) | 2000-03-06 |
| KR19990044467A (en) | 1999-06-25 |
| ATE182450T1 (en) | 1999-08-15 |
| KR100558140B1 (en) | 2006-09-22 |
| EP0850019A1 (en) | 1998-07-01 |
| DE19636124A1 (en) | 1997-03-13 |
| EP0850019B1 (en) | 1999-07-28 |
| WO1997008990A1 (en) | 1997-03-13 |
| PL325340A1 (en) | 1998-07-20 |
| JPH11512182A (en) | 1999-10-19 |
| ES2138834T3 (en) | 2000-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |