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1996 IEEE Ultrasonics Symposium. Proceedings最新文献

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Effects of ions in liquid on leaky SAW character propagating along liquid/layered-substrate structures 液体中离子对沿液体/层状衬底结构传播的漏形SAW特性的影响
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584049
S. Furukawa, M. Obana, T. Nomura
{"title":"Effects of ions in liquid on leaky SAW character propagating along liquid/layered-substrate structures","authors":"S. Furukawa, M. Obana, T. Nomura","doi":"10.1109/ULTSYM.1996.584049","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584049","url":null,"abstract":"The effects of ions in the liquid on the leaky surface acoustic wave (leaky SAW) propagating along liquid/layered-substrate structures are examined by the numerical calculation and the experiment. The ions affect on the conductivity as well as the elastic property of the liquid. In order to use these devices as liquid sensors, the examination should be performed by using the plural substrates which have different leaky SAW propagation character.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133337046","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}
引用次数: 0
Paper stiffness monitoring using laser ultrasonics 激光超声监测纸张硬度
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584170
P. Brodeur, Y. Berthelot, M. A. Johnson, J.P. Gerhardstein
{"title":"Paper stiffness monitoring using laser ultrasonics","authors":"P. Brodeur, Y. Berthelot, M. A. Johnson, J.P. Gerhardstein","doi":"10.1109/ULTSYM.1996.584170","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584170","url":null,"abstract":"The use of a laser ultrasonics method to induce and detect Lamb waves in paper was demonstrated. A pulsed Nd:YAG laser was used for Lamb wave excitation. Detection of out-of-plane and in-plane surface motions was accomplished using a CW Ar:ion laser and appropriate heterodyne interferometric systems. Two propagation modes, a fast mode and a slow mode, were observed with substantially different velocities, amplitudes, and frequency contents. They were found to correspond to the fundamental dilatational (S/sub 0/) and bending (A/sub 0/) modes for Lamb waves, respectively. Velocity measurements gathered along paper machine direction and cross-machine direction for the S/sub 0/ mode were shown to be in very good agreement with velocities obtained using a pair of contact bimorph transducers. Results are presented for various commercial paper grades ranging from fine papers to paperboards. The rationale for contactless real-time stiffness monitoring of a moving paper web is discussed.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133548626","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}
引用次数: 5
Enhancement of acoustoelectric interaction in semiconductors 半导体中声电相互作用的增强
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584050
Z.S. Wu, U.T. Sun, C. Gan, H. Qin, K. Chen
{"title":"Enhancement of acoustoelectric interaction in semiconductors","authors":"Z.S. Wu, U.T. Sun, C. Gan, H. Qin, K. Chen","doi":"10.1109/ULTSYM.1996.584050","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584050","url":null,"abstract":"The enhancement of acoustoelectric (AE) interaction in semiconductors produced by surface acoustic waves (SAW) is analyzed theoretically and observed experimentally. The illumination of Laser beam onto the crystalized-semiconductor has increased the AE interaction noticeably.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222004","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}
引用次数: 0
Correlation between ultrasound B-mode images of carotid plaque and histological examination 颈动脉斑块b超影像与组织学检查的相关性研究
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584175
S. K. Jespersen, M.-L.M. Granholdt, J. Wilhjelm, B. Wiebe, L.K. Hansens, H. Sillesen
{"title":"Correlation between ultrasound B-mode images of carotid plaque and histological examination","authors":"S. K. Jespersen, M.-L.M. Granholdt, J. Wilhjelm, B. Wiebe, L.K. Hansens, H. Sillesen","doi":"10.1109/ULTSYM.1996.584175","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584175","url":null,"abstract":"This paper reports on a study on 69 patients where image features extracted from B-mode ultrasound images of atherosclerotic plaque in the carotid arteries were compared to histological results obtained from the same plaque after carotid endarterectomy. The study also investigated the correlation between image features and visual classification of the plaque appearance as revealed by ultrasound scanning. The study found a few texture features to be significantly correlated to the histological findings within the training set (p=0.002-0.04). However, the correlation found may not be reliable for clinical determination of plaque composition. The correlation between image texture features and the visual classification of the B-mode images was, not surprisingly, found to be much better. Thus, computer analysis is likely to be useful in future investigations as many problems with intra- and inter-observer variations that inherently exist in the subjective visual classification can be eliminated.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"39 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114122389","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}
引用次数: 5
Characteristics of contrast agents and 2D imaging 造影剂的特点和二维成像
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584339
N. de Jong, P. Frinking, F. T. ten Cate, P. A. van der Wouw
{"title":"Characteristics of contrast agents and 2D imaging","authors":"N. de Jong, P. Frinking, F. T. ten Cate, P. A. van der Wouw","doi":"10.1109/ULTSYM.1996.584339","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584339","url":null,"abstract":"Small (encapsulated) gas bubbles in a contrast medium react on an external oscillating pressure field with volume pulsations. Depending on the magnitude of the ultrasound wave the pulsation will be: (1) linear to the applied pressure, or (2) non-linear to the applied pressure. The latter can be split into stationary and transient scattering. For low amplitudes of the acoustic field the instantaneous radius of the bubbles is linearly related to the amplitude of the applied external pressure field. For higher amplitudes of the external field the pulsation of the bubbles becomes nonlinear with the amplitude of the external field. The spectrum of the scattered ultrasound wave contains also higher harmonics of the ground frequency. For even higher amplitudes of the acoustic field the noticed scatter properties of encapsulated bubbles in a contrast medium increase dramatically and become transient. The scattered frequency spectrum containing second and third harmonics broadens. The properties of the encapsulated bubbles change due to rupture, disappearance, change of gas content, etc. Conventional 2D imaging machinery limits the capability of ultrasound contrast agents. Stationary and transient non-linear scattering occurs at acoustic pressures currently employed. Absorption, acoustic velocity, resonance behaviour, frequency and pressure dependency are different from normal tissue. Using these specific characteristics of the agents will open new perspectives in both imaging and analysis for medical diagnosis.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115242996","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}
引用次数: 26
The behavior of quasi-longitudinal leaky surface waves in crystals 晶体中准纵向泄漏表面波的行为
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583814
N. Naumenko
{"title":"The behavior of quasi-longitudinal leaky surface waves in crystals","authors":"N. Naumenko","doi":"10.1109/ULTSYM.1996.583814","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583814","url":null,"abstract":"A numerical analysis of non-leaky surface waves propagating in crystals at the supersonic velocity has been performed. These waves were found to be composite bulk waves (CBWs), in general three-partial and comprising incident quasi-longitudinal and two reflected quasi-transverse bulk modes. A projection of the subspace, in which the CBW satisfies the stress-free boundary condition, was calculated for orientations of LiNbO/sub 3/, defined by the Euler angles (90/spl deg/, 90/spl deg/, /spl psi/). The angle /spl psi/=163.3/spl deg/, for which CBW satisfies both mechanical and electrical boundary conditions, agrees with known propagation direction for non-leaky wave, and the angular dependence of velocity for CBW is very close to that of leaky waves, when the surface is nonmetallized. Application of the same technique to quartz cuts (0/spl deg/,/spl theta/,/spl psi/) gave the lines of supersonic non-leaky waves. These lines include exceptional waves, which correspond to degeneration of the three-partial CBW into one-partial exceptional wave.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116222576","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}
引用次数: 5
C-scan imaging by radiation force stimulated acoustic emission method 辐射力激发声发射法c扫描成像
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584341
M. Fatemi, J. Greenleaf
{"title":"C-scan imaging by radiation force stimulated acoustic emission method","authors":"M. Fatemi, J. Greenleaf","doi":"10.1109/ULTSYM.1996.584341","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584341","url":null,"abstract":"A novel C-scan imaging method is presented. This method utilizes the radiation force to stimulate an acoustic emission by the object at low frequencies. The radiation force, which is highly localized, is produced employing two intersecting focused ultrasound beams driven by two CW sources at slightly different frequencies. The acoustic emission is generated at the difference, or the beat, frequency. This field is nondirective and is detected by a hydrophone. It is shown that the amplitude of the acoustic field is linearly proportional to the peak instantaneous ultrasound power. This has been verified experimentally using a pinhead object and two identical transducers in a water tank. C-scan images are obtained by displaying the amplitude of the acoustic field versus beam position while the object is raster scanned.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116451865","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}
引用次数: 7
Ultrasonic phase velocity and attenuation in emulsions 乳剂中的超声相速度和衰减
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584021
O. Nesse, K. Frøysa
{"title":"Ultrasonic phase velocity and attenuation in emulsions","authors":"O. Nesse, K. Frøysa","doi":"10.1109/ULTSYM.1996.584021","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584021","url":null,"abstract":"Measurements of ultrasonic phase velocity and attenuation in emulsions have been carried out over a frequency range 250 kHz to 14 MHz for volume fractions of dispersed phase varying from 2% to 80%. The experimental data have been compared to theoretical predictions based on multiple scattering models. At volume fractions up to 50% a good agreement is found between experimental data of an oil-in-water emulsion and the theories. At volume fractions of dispersed phase above 50%, there are important discrepancies between the multiple scattering theories and the measurements on water-in-oil and oil-in-water emulsions. However, measurements on water-in-oil emulsions and attenuation in emulsions of aliphatic oils in water deviate considerably from the theories.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124816540","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}
引用次数: 1
Acoustic plate mode properties of rotated Y-cut quartz 旋转y型石英的声板模特性
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584153
J. Andle, M. Schweyer, L. French, J. Vetelino
{"title":"Acoustic plate mode properties of rotated Y-cut quartz","authors":"J. Andle, M. Schweyer, L. French, J. Vetelino","doi":"10.1109/ULTSYM.1996.584153","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584153","url":null,"abstract":"Recent demands for compact, low cost, accurate sensors for fluid phase operation have been largely unsatisfied. Among the most promising technologies are piezoelectric sensors. The piezoelectric sensors directly detect mechanical and electrical property changes caused by the analyte and are thus amenable to continuous monitoring of fluid streams. The current effort is directed towards the development of trace ion (e.g. mercury) and biochemical (e.g. DNA, antibodies, toxins) detection. Several candidate structures have been proposed and many have been shown to be feasible for fluid phase sensing with the best experimental piezoelectric sensor results published to date employing the shear horizontal acoustic plate mode (SHAPM) structure. This type of sensor has detected approximately 10 ng/ml of such analytes as mercury, human IgG and cholera toxin and employed Z-cut X-propagating (ZX) lithium niobate (LiNbO/sub 3/) SHAPM devices. The ZX LiNbO/sub 3/ wafers provide low propagation loss, high mass sensitivity, high electrical coupling and a single electrically-dominant acoustic mode. However, the principal drawback is the poor temperature stability of the material (/spl sim/-70 ppm//spl deg/C). In order to obtain better results the residual temperature instability of LiNbO/sub 3/ must be overcome. The current work analyzes potentially temperature stable plate modes in quartz crystals for dominant, temperature-stable electrically-efficient, mass-sensitive acoustic modes with low propagation loss under fluid loading.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130797785","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}
引用次数: 9
Electromagnetic modeling of package parasitics in SAW-duplexer saw双工器封装寄生的电磁建模
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583777
T. Makkonen, V. Plessky, S. Kondratiev, M. Salomaa
{"title":"Electromagnetic modeling of package parasitics in SAW-duplexer","authors":"T. Makkonen, V. Plessky, S. Kondratiev, M. Salomaa","doi":"10.1109/ULTSYM.1996.583777","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583777","url":null,"abstract":"We model the inductive and capacitive parasitic electromagnetic couplings in a packaged surface-acoustic wave (SAW) antenna duplexer. Theoretical estimates for self- and mutual inductances of the bond wires are computed in the presence of two ground planes. An equivalent circuit for the duplexer including the parasitic elements is presented. The frequency response of the duplexer is predicted with the help of circuit simulation. The modeling is further refined with optimization of the model parameters to improve the fit between the measured and simulated responses.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129245021","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}
引用次数: 20
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