M. Wark, B. Kalanyan, L. Ellis, J. Fick, L. Connell, D. Neivandt, J. Vetelino
In the United States, approximately 20% of all foodborne disease outbreaks result from the consumption of seafood products. Specifically, the disease Paralytic Shellfish Poisoning (PSP) is caused by consuming molluscan shellfish contaminated with a suite of neurotoxins the most potent of which is saxitoxin (STX). The current method for detecting STX is the mouse bioassay in which a mouse is exposed to a shellfish sample and the time required for the mouse to perish is noted. The length of time required for the mouse to die is used to estimate the level of STX in the original sample. Since this technique is a time consuming and costly laboratory-based procedure, a rapid in situ sensor is needed to detect STX levels in shellfish and in sea water so timely closures of shellfish grounds can be made to protect public health. In this work, a novel Lateral Field Excited (LFE) acoustic wave sensor, which has been successfully used for chemical and biological sensing, is employed to detect STX in water, proving itself as a feasible alternative to the mouse bioassay in STX detection.
{"title":"P0-9 A Lateral Field Excited Acoustic Wave Sensor for the Detection of Saxitoxin in Water","authors":"M. Wark, B. Kalanyan, L. Ellis, J. Fick, L. Connell, D. Neivandt, J. Vetelino","doi":"10.1109/ULTSYM.2007.306","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.306","url":null,"abstract":"In the United States, approximately 20% of all foodborne disease outbreaks result from the consumption of seafood products. Specifically, the disease Paralytic Shellfish Poisoning (PSP) is caused by consuming molluscan shellfish contaminated with a suite of neurotoxins the most potent of which is saxitoxin (STX). The current method for detecting STX is the mouse bioassay in which a mouse is exposed to a shellfish sample and the time required for the mouse to perish is noted. The length of time required for the mouse to die is used to estimate the level of STX in the original sample. Since this technique is a time consuming and costly laboratory-based procedure, a rapid in situ sensor is needed to detect STX levels in shellfish and in sea water so timely closures of shellfish grounds can be made to protect public health. In this work, a novel Lateral Field Excited (LFE) acoustic wave sensor, which has been successfully used for chemical and biological sensing, is employed to detect STX in water, proving itself as a feasible alternative to the mouse bioassay in STX detection.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"39 1","pages":"1217-1220"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88024597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Passive ID-tags that could be read remotely is an area of growing commercial interest. Here we look at a small tag in the low MHz range for under water use, based on acoustic resonances. It could be used in sea water, where RF-signals are heavily damped, and it could easily be made small, as there is no need for bulky antennas and hence will have an advantage over the more common RF-ID-tags based on electromagnetic waves. The tag is intended for an as yet unspecified laboratory use, where we may assume a moderate distance between tag and detector system. As a design example we look at a circular tag with diameter 300 micrometer, and resonances in the 1 to 4 MHz range. The resonators are circular nitride membranes over an evacuated cavity in the tag substrate. We review the analysis of the resonators, which is based on coupling of the acoustic vibration modes of the membranes and the tag substrate through the fluid A detailed response of an ID-tag with on the order of ten to twenty resonators may be found easily and fast from predetermined data for resonators and substrate. Both radiation losses and viscosity losses in water are included. It is found that resonator Q's are limited to about 20 in water at 4 MHz, and further that the viscosity leads to a small shift in the resonance frequencies. The number of identities for a tag design as discussed here could be in the range 50,000 to 100,000 or more.
{"title":"6E-4 Acoustic ID-Tags for Under Water Use","authors":"A. Rønnekleiv","doi":"10.1109/ULTSYM.2007.132","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.132","url":null,"abstract":"Passive ID-tags that could be read remotely is an area of growing commercial interest. Here we look at a small tag in the low MHz range for under water use, based on acoustic resonances. It could be used in sea water, where RF-signals are heavily damped, and it could easily be made small, as there is no need for bulky antennas and hence will have an advantage over the more common RF-ID-tags based on electromagnetic waves. The tag is intended for an as yet unspecified laboratory use, where we may assume a moderate distance between tag and detector system. As a design example we look at a circular tag with diameter 300 micrometer, and resonances in the 1 to 4 MHz range. The resonators are circular nitride membranes over an evacuated cavity in the tag substrate. We review the analysis of the resonators, which is based on coupling of the acoustic vibration modes of the membranes and the tag substrate through the fluid A detailed response of an ID-tag with on the order of ten to twenty resonators may be found easily and fast from predetermined data for resonators and substrate. Both radiation losses and viscosity losses in water are included. It is found that resonator Q's are limited to about 20 in water at 4 MHz, and further that the viscosity leads to a small shift in the resonance frequencies. The number of identities for a tag design as discussed here could be in the range 50,000 to 100,000 or more.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"24 1","pages":"492-495"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88044105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We show that the conversional three-dimensional plane wave expansion method can be revised to investigate the lamb wave propagation in the plate with two-dimensional phononic crystal layer coated on uniform substrate. We find that an imaginary three-dimensional periodic system can be constructed by stacking the studied plates and vacuum layers alternately, and then the Fourier series expansion can be performed. The difference between our imaginary periodic system and the true three-dimensional one is that, in our system, the Bloch feature of the wave along the thickness direction is broken. Three different systems are investigated by the proposed method as examples. The principle and reliability of the method are also discussed.
{"title":"3E-4 Plane-Wave-Expansion Method for Lamb Wave Propagation in Plate with Two-Dimensional Phononic Crystal Layer Coated on Uniform Substrate","authors":"Z. Hou, B. Assouar","doi":"10.1109/ULTSYM.2007.56","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.56","url":null,"abstract":"We show that the conversional three-dimensional plane wave expansion method can be revised to investigate the lamb wave propagation in the plate with two-dimensional phononic crystal layer coated on uniform substrate. We find that an imaginary three-dimensional periodic system can be constructed by stacking the studied plates and vacuum layers alternately, and then the Fourier series expansion can be performed. The difference between our imaginary periodic system and the true three-dimensional one is that, in our system, the Bloch feature of the wave along the thickness direction is broken. Three different systems are investigated by the proposed method as examples. The principle and reliability of the method are also discussed.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"3 1","pages":"179-182"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86121252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents the latest development of MEMS high frequency ultrasound transducers with PZT piezoelectric thick films. Composite PZT solution was prepared and deposited on platinum-plated silicon wafers to fabricate active ferroelectrics thick-films. Particle size distribution (PSD) and powder of PZT-to-solution mass ratio effects of the composite solution were systematically studied to enhance electrical properties of PZT thick films. Improvements to the PZT film deposition process have yielded high quality, crack-free PZT films up to 18 mum in thickness. High-frequency (>80 MHz) transducers based on these thick PZT films have been successfully fabricated. The measured results show that these transducers possess much better sensitivity than previous PZT film transducers.
{"title":"11F-5 High-Frequency Piezoelectric PZT Film Micromachined Ultrasonic Transducers","authors":"Q.F. Zhou, D. Wu, F. Djuth, C.G. Liu, K. Shung","doi":"10.1109/ULTSYM.2007.267","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.267","url":null,"abstract":"This paper presents the latest development of MEMS high frequency ultrasound transducers with PZT piezoelectric thick films. Composite PZT solution was prepared and deposited on platinum-plated silicon wafers to fabricate active ferroelectrics thick-films. Particle size distribution (PSD) and powder of PZT-to-solution mass ratio effects of the composite solution were systematically studied to enhance electrical properties of PZT thick films. Improvements to the PZT film deposition process have yielded high quality, crack-free PZT films up to 18 mum in thickness. High-frequency (>80 MHz) transducers based on these thick PZT films have been successfully fabricated. The measured results show that these transducers possess much better sensitivity than previous PZT film transducers.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"14 1","pages":"1057-1060"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86234525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Langatate (LGT) has been grown and characterized more intensively in the past decade and the reported acoustic wave properties of this relatively recent crystal have shown significant variations among different groups. Yet to be determined is how much of this dissimilarity is attributable to variations in the growth process or to different measurement techniques. For the dielectric permittivity, in particular, previously published values of epsivS 11/epsiv0 differ from each other by as much as 33% while those of epsivS 33/epsiv0 differ by up to 25% at room temperature. In this work, the dielectric constants of LGT are determined by measurements made from room temperature (25degC) up to 120degC. The permittivity was extracted from capacitance measurements using a precision LCR meter and computer controlled oven. LGT plates oriented along the X, Y, and Z crystalline axes were cut, ground, and polished to an optical finish at the University of Maine's Microwave Acoustic Lab facilities. The capacitor electrodes were deposited using an aerosol spray method chosen for ease of fabrication and to allow for multiple uses of each of the LGT sample. The measured relative dielectric constants reported in this work are: epsivS 11/epsiv0 is 17.69 +/- 0.30 and epsivS 33/epsiv0 is 70.73 +/- 1.24, which are 11.5% and 7.3% lower then an average of previously published values. The paper discusses the data provided and the associated uncertainties.
{"title":"P1F-4 Revisiting LGT Dielectric Constants and Temperature Coefficients Up to 120°C","authors":"P. Davulis, B. Sturtevant, S. Duy, M. D. da Cunha","doi":"10.1109/ULTSYM.2007.351","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.351","url":null,"abstract":"Langatate (LGT) has been grown and characterized more intensively in the past decade and the reported acoustic wave properties of this relatively recent crystal have shown significant variations among different groups. Yet to be determined is how much of this dissimilarity is attributable to variations in the growth process or to different measurement techniques. For the dielectric permittivity, in particular, previously published values of epsivS 11/epsiv0 differ from each other by as much as 33% while those of epsivS 33/epsiv0 differ by up to 25% at room temperature. In this work, the dielectric constants of LGT are determined by measurements made from room temperature (25degC) up to 120degC. The permittivity was extracted from capacitance measurements using a precision LCR meter and computer controlled oven. LGT plates oriented along the X, Y, and Z crystalline axes were cut, ground, and polished to an optical finish at the University of Maine's Microwave Acoustic Lab facilities. The capacitor electrodes were deposited using an aerosol spray method chosen for ease of fabrication and to allow for multiple uses of each of the LGT sample. The measured relative dielectric constants reported in this work are: epsivS 11/epsiv0 is 17.69 +/- 0.30 and epsivS 33/epsiv0 is 70.73 +/- 1.24, which are 11.5% and 7.3% lower then an average of previously published values. The paper discusses the data provided and the associated uncertainties.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"6 1","pages":"1397-1400"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86546207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Ohara, N. Yanase, T. Yasumoto, M. Kawase, S. Masuko, T. Ohno, K. Sano
One of the most challenging issues in designing film bulk acoustic wave resonators (FBARs) is how to realize high-Q resonators. According to our experimental results, an acoustic leakage is the dominant loss factor at antiresonance frequency for FBARs with an aluminum bottom electrode. In this paper, we report simulation results obtained using the 2-dimensional finite element method (2D FEM), which was employed in order to confirm the above-mentioned acoustic loss mechanisms and optimize the design parameters of the resonator. As a result, optimizing the aluminum bottom electrode thickness and properly designing an attenuation structure that reflects the laterally propagating Lamb waves inside the resonator areas suppress the acoustical leakage significantly. Comparisons between FEM simulation and measured results in terms of the relationship between the Q-factors at antiresonance frequency and the structural parameters of the resonators are shown.
{"title":"P2G-4 Suppression of Acoustic Energy Leakage in FBARs with Al Bottom Electrode: FEM Simulation and Experimental Results","authors":"R. Ohara, N. Yanase, T. Yasumoto, M. Kawase, S. Masuko, T. Ohno, K. Sano","doi":"10.1109/ULTSYM.2007.417","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.417","url":null,"abstract":"One of the most challenging issues in designing film bulk acoustic wave resonators (FBARs) is how to realize high-Q resonators. According to our experimental results, an acoustic leakage is the dominant loss factor at antiresonance frequency for FBARs with an aluminum bottom electrode. In this paper, we report simulation results obtained using the 2-dimensional finite element method (2D FEM), which was employed in order to confirm the above-mentioned acoustic loss mechanisms and optimize the design parameters of the resonator. As a result, optimizing the aluminum bottom electrode thickness and properly designing an attenuation structure that reflects the laterally propagating Lamb waves inside the resonator areas suppress the acoustical leakage significantly. Comparisons between FEM simulation and measured results in terms of the relationship between the Q-factors at antiresonance frequency and the structural parameters of the resonators are shown.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"6 1","pages":"1657-1660"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86566062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In recent studies (Libgot-Calle et al. , Ultras. Med. Biol. ,2007, in press) we showed that a simultaneous measurement of high frequency acoustic parameters could provide quantitative informations regarding the coagulation of human whole blood in vitro. HF acoustic parameters were measured both in double transmission (DT) and backscattering (BS) modes and were linked to biophysical and biochemical changes in clotting blood. The aim of this study was to discriminate the respective influence of red blood cells (RBC) and plasma proteins - especially fibrin network formation - on the evolution of our DT parameters and therefore on the mechanical properties of the clot. A 30 MHz ultrasonic transducer was used to estimate acoustic velocity and integrated attenuation coefficient (IAC) in whole blood, blood with various hematocrit, plasma, and plasma with added thrombin and the results underlined a major influence of RBC on our parameters.
在最近的研究中(Libgot-Calle et al.， Ultras。地中海,杂志。，2007年出版)我们表明，同时测量高频声学参数可以提供有关体外人全血凝固的定量信息。高频声学参数以双透射(DT)和后向散射(BS)模式测量，并与凝血中的生物物理和生化变化有关。本研究的目的是区分红细胞(RBC)和血浆蛋白(特别是纤维蛋白网络的形成)对DT参数演变的各自影响，从而对凝块的机械特性产生影响。用30 MHz超声换能器测量全血、不同红细胞比容的血液、血浆和添加凝血酶的血浆中的声速和综合衰减系数(IAC)，结果表明红细胞对我们的参数有重要影响。
{"title":"10C-2 High Frequency Ultrasound Characterization of Blood Clotting Process: Results Obtained With Plasma and Whole Blood","authors":"C. Plag, R. Libgot, Y. Gruel, F. Patat, F. Ossant","doi":"10.1109/ULTSYM.2007.226","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.226","url":null,"abstract":"In recent studies (Libgot-Calle et al. , Ultras. Med. Biol. ,2007, in press) we showed that a simultaneous measurement of high frequency acoustic parameters could provide quantitative informations regarding the coagulation of human whole blood in vitro. HF acoustic parameters were measured both in double transmission (DT) and backscattering (BS) modes and were linked to biophysical and biochemical changes in clotting blood. The aim of this study was to discriminate the respective influence of red blood cells (RBC) and plasma proteins - especially fibrin network formation - on the evolution of our DT parameters and therefore on the mechanical properties of the clot. A 30 MHz ultrasonic transducer was used to estimate acoustic velocity and integrated attenuation coefficient (IAC) in whole blood, blood with various hematocrit, plasma, and plasma with added thrombin and the results underlined a major influence of RBC on our parameters.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"36 9 1","pages":"884-887"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82811323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Matsuo, T. Yanagitani, M. Matsukawa, Y. Watanabe
A quasi-shear mode piezoelectric film with high electromechanical coupling coefficient k'15 is attractive for shear wave transducers, shear mode FBAR and SH-SAW devices. The single crystalline ideal ZnO film with c-axis-tilt angle of 28deg from the surface normal of the film has high k'15 value of 0.38. In this study, we have investigated c-axis-tilted ZnO films to obtain sufficient tilt angle and good crystalline alignment using RF magnetron sputtering technique. We focused on the angle between the substrate surface and target surface during the sputtering deposition. In case that the film was deposited on the substrate set at 90deg to the target surface, relatively large c-axis tilted angles of 22.6deg-26.2deg were obtained. Moreover, small psi - scan FWHM values from 6.7deg to 7.8deg of the film indicated good crystalline alignment. Finally, k'15 value of this film was estimated as 0.26, which was the highest value ever reported for c-axis-tilted ZnO or AlN films.
{"title":"P0-12 Highly Oriented C-Axis 23° Tilted ZnO Films with High Quasi-Shear Mode Electromechanical Coupling Coefficients","authors":"T. Matsuo, T. Yanagitani, M. Matsukawa, Y. Watanabe","doi":"10.1109/ULTSYM.2007.309","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.309","url":null,"abstract":"A quasi-shear mode piezoelectric film with high electromechanical coupling coefficient k'15 is attractive for shear wave transducers, shear mode FBAR and SH-SAW devices. The single crystalline ideal ZnO film with c-axis-tilt angle of 28deg from the surface normal of the film has high k'15 value of 0.38. In this study, we have investigated c-axis-tilted ZnO films to obtain sufficient tilt angle and good crystalline alignment using RF magnetron sputtering technique. We focused on the angle between the substrate surface and target surface during the sputtering deposition. In case that the film was deposited on the substrate set at 90deg to the target surface, relatively large c-axis tilted angles of 22.6deg-26.2deg were obtained. Moreover, small psi - scan FWHM values from 6.7deg to 7.8deg of the film indicated good crystalline alignment. Finally, k'15 value of this film was estimated as 0.26, which was the highest value ever reported for c-axis-tilted ZnO or AlN films.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"299 1","pages":"1229-1232"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89031486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hang Gao, H. Choi, P. Claus, S. Boonen, G. van der Perre, W. Lauriks, J. D’hooge
A study is presented in which a new convolution-based methodology has been developed to simulate ultrasound images in a 2D/3D sector format. In order to do so, the datasets were produced by reducing the conventional 2D/3D convolution model into multiple 1D convolutions (one for each line). After scan conversion of the individual image lines, conventional grayscale images were obtained. In this manuscript, a 2D / 3D image of a virtual left ventricle was simulated as an example. Moreover, the grayscale histogram statistics were verified to be Rayleigh distributed.
{"title":"P5C-2 A New Convolution-Based Methodology to Simulate Ultrasound Images in a 2D / 3D Sector Format","authors":"Hang Gao, H. Choi, P. Claus, S. Boonen, G. van der Perre, W. Lauriks, J. D’hooge","doi":"10.1109/ULTSYM.2007.564","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.564","url":null,"abstract":"A study is presented in which a new convolution-based methodology has been developed to simulate ultrasound images in a 2D/3D sector format. In order to do so, the datasets were produced by reducing the conventional 2D/3D convolution model into multiple 1D convolutions (one for each line). After scan conversion of the individual image lines, conventional grayscale images were obtained. In this manuscript, a 2D / 3D image of a virtual left ventricle was simulated as an example. Moreover, the grayscale histogram statistics were verified to be Rayleigh distributed.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"75 1","pages":"2243-2246"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89093705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper we examine the NDE problem of the detection of bonding, verses disbonding, at the interfaces of a typical bonded plate. By using a wide angle focused transducers results are obtained in the space-time domain (V(x,t) data). This setup generates a variety of Lamb modes within the plate, provides leaky wave data spread throughout the time space domain, and eliminates the time domain overlap problems of waveforms from normal incidence testing method. Directly comparing the V(x,t) data additional leaky mode reflections are observed, where the period of these reflections if found to increase linearly with the thickness of the adhesive layer. Additionally we investigate the K-F map (V(k,f) data) generated from the 2D Fourier transform of the V(x,t) data, and briefly compare the expected theoretical results with the experimental results for both V(x,t) data, and K-F maps.
{"title":"12D-5 NDE of Adhesive Joints Using V(x,t) Data","authors":"J. Sadler, S. Titov, R. Maev","doi":"10.1109/ULTSYM.2007.287","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.287","url":null,"abstract":"In this paper we examine the NDE problem of the detection of bonding, verses disbonding, at the interfaces of a typical bonded plate. By using a wide angle focused transducers results are obtained in the space-time domain (V(x,t) data). This setup generates a variety of Lamb modes within the plate, provides leaky wave data spread throughout the time space domain, and eliminates the time domain overlap problems of waveforms from normal incidence testing method. Directly comparing the V(x,t) data additional leaky mode reflections are observed, where the period of these reflections if found to increase linearly with the thickness of the adhesive layer. Additionally we investigate the K-F map (V(k,f) data) generated from the 2D Fourier transform of the V(x,t) data, and briefly compare the expected theoretical results with the experimental results for both V(x,t) data, and K-F maps.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"31 1","pages":"1136-1139"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91538130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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