1. (WO 2000/062946) IMPULSE SOUND TRANSDUCER WITH AN ELEMENTARY BLOCK MADE OF PIEZOELECTRIC MATERIAL 26.10.2000 B06B 1/06 PCT/EP2000/003489 SONIDENT ANSTALT
The invention relates to an impulse sound traducer for the ultrasonic range. Transducers in prior art require complicated and expensive technology in order to really generate good impulses. The invention aims at providing a sound transducer for the ultrasonic range, which transmits strong and short impulses, has high sensitivity and ensures repeatability of parameters. This is achieved by a sound transducer for the ultrasonic range that is used both as a transmitter and as a receiver and is comprised of an elementary block made of piezoelectric material, wherein the height of the elementary blocks consisting of piezoelectric material is bigger than its width and the block on the output end of the impulse has a formed edge so that the elemen...
2. (WO 1997/016260) PIEZOELECTRIC ULTRASONIC TRANSDUCER 09.05.1997 B06B 1/06 PCT/EP1996/004754 SONIDENT ANSTALT BICZ, Wieslaw
The invention concerns an acoustic transducer for the ultrasonic range, which transducer can be used both as a transmitter and as a receiver. By using a piezoceramic transducer element an extremely flexible transducer which is easy to produce, has a broad band width and ensures technological repeatability can be provided. It has been shown that an acoustic transducer for the ultrasonic range satisfies demands when the front and rear surfaces of the active transducer element which are covered with electrodes are structured such that a highly unhomogeneous distribution of the electrical field is attained. In one possible configuration the active transducer element consists of a polarized piezoelectric block on the rear surface of which very d...
3. (WO 1997/008990) METHOD AND DEVICE FOR THE STRUCTURE ANALYSIS AND/OR FOR DETECTING THE POSITION OF LAYERED OBJECTS 13.03.1997 G01N 29/04 PCT/EP1996/003916 SONIDENT ANSTALT BICZ, Wieslaw
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 recei...
4. (WO 1995/033258) PROCESS AND DEVICE FOR GENERATING SPHERICAL WAVES IN THE ULTRASOUND RANGE 07.12.1995 A61B 5/117 PCT/EP1995/002031 SONIDENT ANSTALT LIECHTENSTEINISCHEN RECHTS
The invention relates to a process and device for generating spherical waves in the ultrasound range. The problem addressed by the invention is that of producing perfect spherical waves in the ultrasonic range with high energy and a Gaussian intensity distribution. This is achieved with an arrangement in which sound waves emanating from a standard ultrasound emitter are compressed by surrounding devices and channelled into a single-mode wave guide which emits perfect spherical waves into free space.
5. (WO 1995/029478) PROCESS AND DEVICE FOR TRACING AN ULTRASOUND FIELD 02.11.1995 G01H 3/12 PCT/EP1995/001465 SONIDENT ANSTALT LIECHTENSTEINISCHEN RECHTS
The invention concerns a process and device for tracing an ultrasound field (21). Methods known hitherto required a large number of transducers to pick up the non-emitted ultrasound waves from all directions. According to the proposed development, the number of ultrasound transducers (22) is reduced to one or a few by the expedient of subjecting the waves (21) coming from different directions to various path-lengthening processes (23a-h).
6. (WO 1995/006262) PROCESS FOR IDENTIFYING ULTRASONICALLY REGISTERED OBJECTS 02.03.1995 G01S 7/539 PCT/EP1994/002807 TOPPING BEST LTD. WIESLAW, Bicz
A process is disclosed for identifying surfaces at or close to the surface of ultrasonically registered objects, in particular flat objects, such as objects placed on identification cards. According to this process, known pulse responses of an object are emitted in the reverse order onto the object being examined. A single pulse is sent back after a determined time only when the object being examined matches the registered object. The invention makes use of the autocorrelation that results when the emitted pulse train corresponds to the object being examined.
7. (WO 1987/005790) PROCESS FOR RECOGNIZING A FINGERPRINT 08.10.1987 A61B 5/117 PCT/DE1987/000134 PRITZL, Werner BICZ, Wieslaw
To recognize fingerprints it is proposed to effect scanning by ultrasonic waves. For the purpose of comparison, an acoustic hologram (11) of the features of the finger concerned, inserted in an identification card, can be used, said hologram being compared with an ultrasonic interference specimen which is obtained by the reflection of ultrasonic waves on an interface formed between the surface of the finger (4) and a flat application surface (1).