Lista wybranych publikacji:
The article demonstrates an effective solution for ultrasonic quality monitoring of transmission and drive components of motor vehicles, joined using an innovative method called magnetically impelled arc butt welding (MIAB). The major challenge was the application of ultrasonic technology for quick and reliable testing of thin-walled components with complex geometry. To solve this problem the idea of using ultrasonic subsurface waves was investigated. By using finite elements method (FEM) the angle of the ultrasonic beam incident on the tested element and the frequency of the ultrasonic transducer were verified. Then, scanning acoustic microscopy (SAM) and X-ray computed tomography (CT), both nondestructive tests on thin-walled welded tubular components were performed. The research have shown that it is possible to detect defects with diameter of 0.3 mm with the angle of incidence of wave 31.5°. The results of the numerical analysis were compared with the experimental approach and confirmed the usefulness of proposed method. Finally, the potential of using immersion ultrasonic technique for quick and reliable validation of thin-walled tubular components was proven, as the test duration for a one elements was around 3 s.
Keywords: Magnetically impelled arc butt welding (MIAB) · Scanning acoustic microscopy (SAM) · Finite elements method (FEM) · Ultrasonic subsurface waves
Journal of Nondestructive Evaluation (2020) 39:42 https://doi.org/10.1007/s10921-020-00684-3
Real-time quality metering of propanated biomethane
Abstract: This paper presents a correlative method for the real-time measurement of quality characteristics of propanated biomethane for pipeline injection according to the European and Swedish regulations. The target quality properties (superior calorific value and Wobbe index) were predicted by the developed regression model based on the measurement of a selected set of physical properties of the gas samples. The measured physical properties are the thermal conductivity, the carbon dioxide concentration, the speed of sound, and the sound attenuation parameter measured as the ultrasonic signal dampening at 1 MHz. The empirical model of the sound attenuation parameter was developed for selected gases in order to predict a sufficient amount of data points for training the regression model. The developed regression model was tested experimentally and demonstrated good agreement with chromatographic analyses.
Keywords: Calorific value; Wobbe index; biomethane; propanated biomethane; ultrasonic measurement; speed of sound; ultrasound attenuation; correlative method; natural gas; time of flight; gas analysis.
Abstract: This paper describes finger reader, that generates a fingerprint image using ultrasonic waves travelling parallel to the sensor surface in concert with the principle of acoustic holography. The idea realized in this unit allows for the creation of devices based on thin plates of varying sizes, from smaller than a postage stamp, to the largest live scan applications that can be integrated with typical touch screens. The device is able to recognize the type of material that comes into contact with sensor surface, allowing it detect features consistent with living fingers and, therefore, differentiate between live and fake fingerprints. The sensitive sensor plate, or platen, used in the device can be constructed from a variety of different solid materials, such as glass and metals. The transducers are placed on the rim of the sensor plate The working principle of the device is based on the directions of ultrasound waves and not on pixels, hence the complexity of the device does not depend on the size of the sensitive area. Achievable resolution can be much higher than necessary for finger recognition. The device referenced in this presentation achieves resolution that is comparable to 1000 dpi.
Keywords: Finger recognition, ultrasonic holography, live finger recognition, touch screen, liveness detection
Gesellschaft fur Informatik, GI-Edition Lecture Notes in Informatics (LNI) P-260; BIOSIG2016 Proceedings of the 15th International Conference, 21.–23. September 2016 Darmstadt
Development of Ultrasonic Finger Reader Based on Ultrasonic Holography Having Sensor Area with 80 mm Diameter
Publisher: IEEE Date Added to IEEE Xplore: 07 November 2016 DOI:10.1109/BIOSIG.2016.7736918
An application of critically refracted longitudinal ultrasonic subsurface waves (LCR) to industrial nondestructive testing of thin walled pipe shaped elements of shock absorbers, axle shafts and transmission shafts
Praktyczne wykorzystanie ultradźwiękowych fal podpowierzchniowych (fal LCR) w przemysłowych badaniach cienkościennych elementów rurowych amortyzatorów, półosi i wałów napędowych.
The paper describes the application of critically refracted longitudinal ultrasonic subsurface waves (LCR, known also as lateral, creeping or head waves) to nondestructive flaw detection in friction welding or MAIB welded thin walled pipe shaped parts. The theory, a practical laboratory and industrial applications are presented.
Keywords: ultrasonic waves, subsurface waves, head waves, LCR, creeping waves, flaw detection in friction butt welds, MIAB welding, ultrasonic testing of thin walled pipes.
W artykule przedstawiono wykorzystanie ultradźwiękowej fali podpowierzchniowej (nazywanej też Lcr, pełzającą, lateralną lub czołową) do wykrywania niezgodności w zgrzeinach tarciowych lub wykonanych metodą MAIB w nieniszczącej kontroli jakości cienkościennych elementów rurowych.
Słowa kluczowe: fale ultradźwiękowe, fale podpowierzchniowe, fale czołowe, fale LCR, fale pełzające, wykrywanie niezgodności w zgrzeinach tarciowych, MIAB, badania nieniszczące, badania ultradźwiękowe cienkościennych elementów rurowych
Abstract: A new instrument for precise measurements of velocity of sound in gases was developed and tested. The instrument implements improved velocity of sound measuring technique based on time-of-flight measurement of ultrasonic pulses. The instrument was developed primarily for conducting measurements in natural gas, it can operate in wide ranges of natural gas compositions as well as other gas mixtures with velocity of sound parameter in range of 200 to 500 m/s. The instrument allows conducting measurement of velocity of sound propagation in various gas mixtures with average repeatability of equal to ±1 cm/s at normal conditions. The accuracy of measurement depends on calibration conditions and approach, and has good agreement with theoretically calculated values. The instrument has a modular design of control unit and flow-through measuring chamber. The set of distinctive features and adjustable measuring parameters of the instrument allows further improving of applicability for other gases and gas mixtures and various measurement conditions. The instrument showed good performance in the task of quantitative characterization of binary gas mixtures by velocity of sound parameter.
The touch of the fingertip
Abstract (EN) Mobile phones have become an inseparable companion of many people and are useful in more and more cases. However, it is increasingly necessary to ensure that they can only be used by an authorized person, i.e. only the owner of the phone.
Abstrakt: Telefony komórkowe stały się nieodłącznym towarzyszem wielu ludzi i przydają się w coraz większej liczbie wypadków. Coraz częściej jednak konieczne jest zagwarantowanie, że może z nich skorzystać tylko osoba uprawniona, czyli wyłącznie właściciel telefonu
Fingerprint Structure Imaging Based on an Ultrasound Camera
This paper describes the design of an ultrasound camera which has a resolution of 0.1mm. The camera allows the observation of the near surface structures of solid objects and is suitable for the finger ridge pattern imaging (i.e., pattern which is reflected in a fingerprint). The device can be used for a biometric identification of individuals (for access verification). It can also be employed for all other sorts of structures which have ultrasound detectable changes in the near surface structure, both natural and artificial (e.g., created for information recording). The paper describes the current version of the camera and the physical phenomena behind its operation. Presented are also perspectives of further development of the device.
Instrumentation Science & Technology; (1999) https://doi.org/10.1080/10739149908085863
This paper describes the design of an ultrasonic camera with a resolution of 0.1mm. The camera makes it possible to observe the near surface structures of solid objects and is suitable for finger ridge pattern imaging (i.e. a pattern reflected in the fingerprint). The device can be used for biometric identification of individuals (for access verification). It can also be employed for all other sorts of structures with ultrasonically detectable changes in the near surface structure, both natural and artificial ones (e.g. created for information recording). The paper describes the current version of the camera and the physical basis of its operation. Perspectives of further development of the device are also presented.
Archives of Acoustics, 23, 1, pp. 139-148, 1998
EN: Read out of structure of fingerprint lines by means of an ultrasonic camera
Języki publikacji PL
Opisano konstrukcję kamery ultradźwiekowej o rozdzielczości ok. 0,1 mm, pozwalającej pozwalającej na obserwacje stref przypowierzchniowych ciał stałych, nadającej się do obserwacji linii papilarnych (powodujących powstawanie odcisków palców). Urzadzenie może być przydatne jako biometryczny identyfikator ludzi (do weryfikacji dostępu), może tez służyć do badania wszelkich innych struktur cechujących sie czytelnymi ultradźwiekowo zmianami w warstwie przypowierzchniowej zarówno naturalnych, jak i sztucznych (np. stworzonych w celu zapisania w nich informacji) Opisano istniejącą obecnie wersje takiej kamery i omówiono zjawisko leżące u podstaw jej działania. Przedstawiono też perspektywy dalszego rozwoju urządzenia.
This paper describes the design of an ultrasound camera which has the resolution of 0,1 mm. The camera allows the observation of the near surface structures of solid objects and is suitable for the finger ridge pattern imaging (i.e. pattern which is reflected in a fingerprint). The device can used for a biometric identification of indindividuals (for acces verification). It can also be employed for all other sorts of structures which have ultrasonoud detectable changes in the near surface structure, both natural and artificial (e.g.created for information recording). The paper describes the current version of the camera and the physical phenomena behind its operation. Presented are also perspectives of futher development of the device.
Czasopismo Pomiary Automatyka Kontrola. Rocznik 1998. Tom R. 44, nr 12. Strony 434-437
Synthetic aperture acoustic microscope for evaluation of finger tip peripheral skin structure
The setup for reconstruction of 2D quasi periodical structures from the measurements of its ultrasonic diffractive field is presented. Construction of the ultrasonic head is based on the prototype of our ultrasonic sensor for fingerprint pattern recognition. An example of the measured and reconstructed acoustic image of a fingerprint is compared with an optical picture.
Proc. SPIE 2390, Optical Biophysics, (30 March 1995); https://doi.org/10.1117/12.205999
Ultrasonic sensor for fingerprints recognition
The paper presents prototypes of ultrasonic sensors for fingerprint pattern recognition. Their principle of operation is based on the amplitude measurements taken in selected points of acoustic field of ultrasonic wave diffracted from subsurface finger structure. Examples of sensor construction and measured data are presented. Fingerprint structure recognition from pulse echo shows the possible use of the sensor as a synthetic aperture microscope.
Optoelectronic and Electronic Sensors; (1995) https://doi.org/10.1117/12.213142
W. Bicz, "Fingerprint structure imaging based on an ultrasound camera", Elektronik 1999
AbstractThis paper describes the design of an ultrasound camera which has a resolution of 0.1mm. The camera allows the observation of the near surface structures of solid objects and is suitable for the finger ridge pattern imaging (i.e., pattern which is reflected in a fingerprint). The device can be used for a biometric identification of individuals (for access verification). It can also be employed for all other sorts of structures which have ultrasound detectable changes in the near surface structure, both natural and artificial (e.g., created for information recording). The paper describes the current version of the camera and the physical phenomena behind its operation. Presented are also perspectives of further development of the device.
Agnieszka Bicz, Wiesław Bicz "Biometria w Polsce", Kontrola dostępu, 4/2008
Agnieszka Bicz, Wiesław Bicz "Biometrics in Poland", 2008 Hasting.org HideNewsletter
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