Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193397
Y. Aoki, H. Yoshida, K. Koh, C. Kaneshiro, K. Hohkawa
In this paper, we present the design of a novel SAW amplifier that consists of multi-stripe tapping electrodes and a GaAs FET amplifier. Using a general circuit simulator, we analyse the frequency characteristics of the SAW amplifier. The SAW amplifier with differential operation shows wideband frequency characteristics better than that without differential operation. We also investigate the frequency characteristics by changing tapping electrode pitches and the impedance matching condition between SAW and FET. These results confirm that the SAW amplifier is applicable to wideband communication systems and signal processing systems.
{"title":"Design of SAW amplifier with distributed semiconductor transistor","authors":"Y. Aoki, H. Yoshida, K. Koh, C. Kaneshiro, K. Hohkawa","doi":"10.1109/ULTSYM.2002.1193397","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193397","url":null,"abstract":"In this paper, we present the design of a novel SAW amplifier that consists of multi-stripe tapping electrodes and a GaAs FET amplifier. Using a general circuit simulator, we analyse the frequency characteristics of the SAW amplifier. The SAW amplifier with differential operation shows wideband frequency characteristics better than that without differential operation. We also investigate the frequency characteristics by changing tapping electrode pitches and the impedance matching condition between SAW and FET. These results confirm that the SAW amplifier is applicable to wideband communication systems and signal processing systems.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129367951","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193449
D. Powell, K. Kalantar-zadeh, S. Ippolito, W. Wlodarski
Surface Acoustic Wave (SAW) sensors comprising a zinc oxide guiding layer deposited on a 36/spl deg/-YX lithium tantalate substrate were developed. They were found to have greater mass sensitivity than other LiTaO/sub 3/ based SAW sensors, such as the -SiO/sub 2//LiTaO/sub 3/ configuration. In this paper, the fabrication of the ZnO/LiTaO/sub 3/ sensor is described and micro-characterisation of the deposited films is presented. Sensitivity of these devices to surface mass and dielectric perturbations is then presented, followed by an analysis of temperature stability.
{"title":"A layered SAW device based on ZnO/LiTaO/sub 3/ for liquid media sensing applications","authors":"D. Powell, K. Kalantar-zadeh, S. Ippolito, W. Wlodarski","doi":"10.1109/ULTSYM.2002.1193449","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193449","url":null,"abstract":"Surface Acoustic Wave (SAW) sensors comprising a zinc oxide guiding layer deposited on a 36/spl deg/-YX lithium tantalate substrate were developed. They were found to have greater mass sensitivity than other LiTaO/sub 3/ based SAW sensors, such as the -SiO/sub 2//LiTaO/sub 3/ configuration. In this paper, the fabrication of the ZnO/LiTaO/sub 3/ sensor is described and micro-characterisation of the deposited films is presented. Sensitivity of these devices to surface mass and dielectric perturbations is then presented, followed by an analysis of temperature stability.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129543037","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1192527
Y. Estanbouli, G. Hayward, J. Barbenel
Despite significant advances in ultrasonic instrumentation, accurate and repeatable measurements of skin structure and dimensions remain problematic. Skin structure is complicated and structural boundaries are non-planar and may be diffuse, inhibiting the application of inversion methods for skin thickness measurement. Coupling a transducer to the skin surface with water or aqueous gel can produce significant artefacts in thickness measurement, which may be prevented by using a rubber dry contact. This work describes a theoretical investigation of these problems, using the PZFlex finite element code as a virtual prototyping tool. Simulations show that non-planar and diffuse boundaries have significant effect on the output backscattered signals; and using of low loss rubber dry contact is possible but further work is required to determine the properties and optimum shape of the rubber interface.
{"title":"A theoretical investigation of ultrasonic transducer design for measurement of skin","authors":"Y. Estanbouli, G. Hayward, J. Barbenel","doi":"10.1109/ULTSYM.2002.1192527","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1192527","url":null,"abstract":"Despite significant advances in ultrasonic instrumentation, accurate and repeatable measurements of skin structure and dimensions remain problematic. Skin structure is complicated and structural boundaries are non-planar and may be diffuse, inhibiting the application of inversion methods for skin thickness measurement. Coupling a transducer to the skin surface with water or aqueous gel can produce significant artefacts in thickness measurement, which may be prevented by using a rubber dry contact. This work describes a theoretical investigation of these problems, using the PZFlex finite element code as a virtual prototyping tool. Simulations show that non-planar and diffuse boundaries have significant effect on the output backscattered signals; and using of low loss rubber dry contact is possible but further work is required to determine the properties and optimum shape of the rubber interface.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123605436","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1192584
R. F. Kerr, M.E. Anderson
We present the results of a study exploring the upper velocity limit of vector flow estimation with Heterodyned Spatial Quadrature. Since this is highly dependent on apodization, we investigated a set of apodization windows designed to explore means of extending the practical velocity range. Heterodyned Spatial Quadrature (HSQ) is a recently described vector flow technique that has been shown to provide accurate flow estimates in both the axial and lateral directions. The complex PSF created by this technique induces a modulation in the received echo of a scatterer traversing the resolution volume at a frequency proportional to the scatterer lateral velocity. We measure the rate of phase change of this modulation to provide an estimate of the lateral flow velocity component. The technique is extendible to 3D vector flow estimation with a 2D array. We expect lateral tracking methods in general to be limited by a number of factors including the PSF beam width and the system amplitude sensitivity. Using a Siemens Elegra ultrasound scanner with a 7.5 MHz linear array, we simulated flow up to 405 /spl mu/m per step in a tissue-mimicking phantom, corresponding to velocities up to 4.05 m/sec for a PRF of 10 kHz, at Doppler angles of 60/spl deg/ and 90/spl deg/. We estimated lateral velocities to within 5% relative bias up to 315 cm/sec in an f/2 geometry at a 90/spl deg/ Doppler angle. The spatial quadrature receive aperture utilized a bi-lobed Blackman apodization with a width of 1/2D, where D is the full width of the array. Computer simulations of the system under similar conditions produced lateral velocity estimates up to 303 cm/sec. As expected, the maximum estimable velocity scales with focal depth. In simulations, the same aperture estimated flow velocities up to 672 cm/sec at a focal depth of 75 mm, representing an f/5 geometry.
{"title":"Aperture design analysis for vector flow imaging","authors":"R. F. Kerr, M.E. Anderson","doi":"10.1109/ULTSYM.2002.1192584","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1192584","url":null,"abstract":"We present the results of a study exploring the upper velocity limit of vector flow estimation with Heterodyned Spatial Quadrature. Since this is highly dependent on apodization, we investigated a set of apodization windows designed to explore means of extending the practical velocity range. Heterodyned Spatial Quadrature (HSQ) is a recently described vector flow technique that has been shown to provide accurate flow estimates in both the axial and lateral directions. The complex PSF created by this technique induces a modulation in the received echo of a scatterer traversing the resolution volume at a frequency proportional to the scatterer lateral velocity. We measure the rate of phase change of this modulation to provide an estimate of the lateral flow velocity component. The technique is extendible to 3D vector flow estimation with a 2D array. We expect lateral tracking methods in general to be limited by a number of factors including the PSF beam width and the system amplitude sensitivity. Using a Siemens Elegra ultrasound scanner with a 7.5 MHz linear array, we simulated flow up to 405 /spl mu/m per step in a tissue-mimicking phantom, corresponding to velocities up to 4.05 m/sec for a PRF of 10 kHz, at Doppler angles of 60/spl deg/ and 90/spl deg/. We estimated lateral velocities to within 5% relative bias up to 315 cm/sec in an f/2 geometry at a 90/spl deg/ Doppler angle. The spatial quadrature receive aperture utilized a bi-lobed Blackman apodization with a width of 1/2D, where D is the full width of the array. Computer simulations of the system under similar conditions produced lateral velocity estimates up to 303 cm/sec. As expected, the maximum estimable velocity scales with focal depth. In simulations, the same aperture estimated flow velocities up to 672 cm/sec at a focal depth of 75 mm, representing an f/5 geometry.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198488","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1192572
A. Watanabe, T. Takatera, T. Sato, S. Takeuchi, H. Nishimura, N. Kawashima
The effect of ultrasound exposure on cancer cell proliferation properties and its mechanism has been studied in our laboratory. The suppression of cancer cells proliferation rate in the culturing process after ultrasound exposure was confirmed. We suppose that the inertial cavitation generated by ultrasound exposure induced the apoptosis in the cancer cells. It was found with a digital microscope that the shape of the cancer cells did not change remarkably immediately after ultrasound exposure, but the cancer cells exposed to ultrasound shrunk gradually with passage of culturing time. Ladder patterns of electrophoresis were observed in the agarose gel with apoptosis induced cancer cells with ultrasound exposure. Therefore, it can be thought that the suppression of cancer cells proliferation by ultrasound exposure was caused by induction of apoptosis in the cancer cells.
{"title":"Study on suppression mechanism of cancer cells proliferation by ultrasound exposure for minimally invasive cancer treatment","authors":"A. Watanabe, T. Takatera, T. Sato, S. Takeuchi, H. Nishimura, N. Kawashima","doi":"10.1109/ULTSYM.2002.1192572","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1192572","url":null,"abstract":"The effect of ultrasound exposure on cancer cell proliferation properties and its mechanism has been studied in our laboratory. The suppression of cancer cells proliferation rate in the culturing process after ultrasound exposure was confirmed. We suppose that the inertial cavitation generated by ultrasound exposure induced the apoptosis in the cancer cells. It was found with a digital microscope that the shape of the cancer cells did not change remarkably immediately after ultrasound exposure, but the cancer cells exposed to ultrasound shrunk gradually with passage of culturing time. Ladder patterns of electrophoresis were observed in the agarose gel with apoptosis induced cancer cells with ultrasound exposure. Therefore, it can be thought that the suppression of cancer cells proliferation by ultrasound exposure was caused by induction of apoptosis in the cancer cells.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121675804","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193536
Shih-Jeh Wu, C. Jeng, Jow-Lay Huang
Chromium carbide (Cr/sub 3/C/sub 2/) has been proved to be a potential material for toughening alumina in biomedical and industrial applications because of its high Young's modulus and erosion resistance. On the other hand, TiC/Al/sub 2/O/sub 3/ composite has been used a magnetic head slider due to its good wear resistance and mechanical strength. In this study we prepare samples of Cr/sub 3/C/sub 2//Al/sub 2/O/sub 3/ composite by injection moulding method. To use this ceramic material as structural components when the temperature varies rapidly, it is necessary to be able to estimate damage or thermal shock cracking. Ultrasonic attenuation measurements are made for assessment of thermal shock damage. Results show that the attenuation increases as the shock temperature raises. Corresponding SEM pictures show although the size of micro-crack doesn't change the depth of the micro-cracks increases. It is demonstrated that ultrasonic attenuation proves to be a reliable tool for evaluating micro-fractures in solids.
{"title":"Ultrasonic evaluation of thermally shocked Cr/sub 3/C/sub 2//Al/sub 2/O/sub 3/","authors":"Shih-Jeh Wu, C. Jeng, Jow-Lay Huang","doi":"10.1109/ULTSYM.2002.1193536","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193536","url":null,"abstract":"Chromium carbide (Cr/sub 3/C/sub 2/) has been proved to be a potential material for toughening alumina in biomedical and industrial applications because of its high Young's modulus and erosion resistance. On the other hand, TiC/Al/sub 2/O/sub 3/ composite has been used a magnetic head slider due to its good wear resistance and mechanical strength. In this study we prepare samples of Cr/sub 3/C/sub 2//Al/sub 2/O/sub 3/ composite by injection moulding method. To use this ceramic material as structural components when the temperature varies rapidly, it is necessary to be able to estimate damage or thermal shock cracking. Ultrasonic attenuation measurements are made for assessment of thermal shock damage. Results show that the attenuation increases as the shock temperature raises. Corresponding SEM pictures show although the size of micro-crack doesn't change the depth of the micro-cracks increases. It is demonstrated that ultrasonic attenuation proves to be a reliable tool for evaluating micro-fractures in solids.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"78 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113940818","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193406
Y. Tasinkevych, E.J. Danicki
Different methods of numerical evaluation of the spatial spectrum of electric charge distribution on the IDT strips are considered in this paper. A comparison of two of them is given. Numerical results are presented to compare positive and negative features of the methods.
{"title":"Numerical efficiency of IDT charge spatial spectrum evaluation methods","authors":"Y. Tasinkevych, E.J. Danicki","doi":"10.1109/ULTSYM.2002.1193406","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193406","url":null,"abstract":"Different methods of numerical evaluation of the spatial spectrum of electric charge distribution on the IDT strips are considered in this paper. A comparison of two of them is given. Numerical results are presented to compare positive and negative features of the methods.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127700389","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1192578
D. Kruse, M. Lim, D. Redline, P. Eisele, K. Ferrara
We use high frequency ultrasound to assess the effect of laser cyclophotocoagulation (CPC) on blood flow in the anterior segment of the eye. We show that laser CPC treatment applied to the rabbit eye provides a unique way to interrupt blood flow in the ciliary body, thus serving as a new method for evaluating clutter rejection performance in the microcirculation with and without an ultrasound contrast agent. We apply a recently developed eigendecomposition-based clutter rejection filter with modifications to deal with high blood-to-clutter ratio's (BCR) encountered at high frequencies, particularly with ultrasound contrast agents. In vivo results are presented to illustrate treatment effects, clutter rejection, and contrast agent enhancement.
{"title":"High frequency ultrasound with an eigen-decomposition filter to assess the effect of laser cyclophotocoagulation treatment on blood flow","authors":"D. Kruse, M. Lim, D. Redline, P. Eisele, K. Ferrara","doi":"10.1109/ULTSYM.2002.1192578","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1192578","url":null,"abstract":"We use high frequency ultrasound to assess the effect of laser cyclophotocoagulation (CPC) on blood flow in the anterior segment of the eye. We show that laser CPC treatment applied to the rabbit eye provides a unique way to interrupt blood flow in the ciliary body, thus serving as a new method for evaluating clutter rejection performance in the microcirculation with and without an ultrasound contrast agent. We apply a recently developed eigendecomposition-based clutter rejection filter with modifications to deal with high blood-to-clutter ratio's (BCR) encountered at high frequencies, particularly with ultrasound contrast agents. In vivo results are presented to illustrate treatment effects, clutter rejection, and contrast agent enhancement.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127999303","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193526
S. Cochran, J. Earnshaw, B. Bargain, K. Kirk
The synthetic aperture focusing (SAF) technique allows exploration of ultrasonic array imaging performance with minimal hardware and it can provide excellent imaging results for point defects, such as fatigue crack tips, commonly found in non-destructive testing (NDT). However, it performs less well when imaging defects which are flat or curved with radii large relative to the ultrasonic wavelength. Here, we report an enhanced time-domain algorithm which can deal with flat and curved defects and which we have termed "synthetic aperture correlation". It is based on processing signals from multiple overlapping subsets of elements from an entire array. The algorithm has roots in SAF, matched filtering, beam steering and biomedical ultrasonic imaging. The data collection process is the same as for SAF and the new algorithm operates entirely in reception, off-line. It has been tested using a 96-element linear array operating at 6 MHz on aluminum test objects. We present simulated and experimental results and compare these with B-scans showing timer-of-flight diffraction (TOFD) characteristics and with conventional SAF. We highlight the advantages of the new algorithm, such as its enhanced capability to deal with noise, and drawbacks such-as increased computational expense.
{"title":"Extending the synthetic aperture focusing algorithm to deal with flat and curved features in NDT","authors":"S. Cochran, J. Earnshaw, B. Bargain, K. Kirk","doi":"10.1109/ULTSYM.2002.1193526","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193526","url":null,"abstract":"The synthetic aperture focusing (SAF) technique allows exploration of ultrasonic array imaging performance with minimal hardware and it can provide excellent imaging results for point defects, such as fatigue crack tips, commonly found in non-destructive testing (NDT). However, it performs less well when imaging defects which are flat or curved with radii large relative to the ultrasonic wavelength. Here, we report an enhanced time-domain algorithm which can deal with flat and curved defects and which we have termed \"synthetic aperture correlation\". It is based on processing signals from multiple overlapping subsets of elements from an entire array. The algorithm has roots in SAF, matched filtering, beam steering and biomedical ultrasonic imaging. The data collection process is the same as for SAF and the new algorithm operates entirely in reception, off-line. It has been tested using a 96-element linear array operating at 6 MHz on aluminum test objects. We present simulated and experimental results and compare these with B-scans showing timer-of-flight diffraction (TOFD) characteristics and with conventional SAF. We highlight the advantages of the new algorithm, such as its enhanced capability to deal with noise, and drawbacks such-as increased computational expense.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128032805","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}
Pub Date : 2002-10-08DOI: 10.1109/ULTSYM.2002.1193395
T. Shiba, Y. Fujita, S. Kondo, J. Hamasaki, Mayumi Ide, S. Ogawa, K. Oda
An equivalent circuit analysis including meander electrode resistance is applied to an acoustic coupler which has been proposed using cascaded quadrature wavelength group-type unidirectional structure. Linear circuit composition procedure for multi ports elements is applied in order to explain the meander resistive effect. Cascade-connected ports are prepared for the meander electrode. The experimental results was found to be in good agreement with the improved circuit calculation.
{"title":"Effect of electrode resistance for acoustic coupler using quadrature electrode","authors":"T. Shiba, Y. Fujita, S. Kondo, J. Hamasaki, Mayumi Ide, S. Ogawa, K. Oda","doi":"10.1109/ULTSYM.2002.1193395","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193395","url":null,"abstract":"An equivalent circuit analysis including meander electrode resistance is applied to an acoustic coupler which has been proposed using cascaded quadrature wavelength group-type unidirectional structure. Linear circuit composition procedure for multi ports elements is applied in order to explain the meander resistive effect. Cascade-connected ports are prepared for the meander electrode. The experimental results was found to be in good agreement with the improved circuit calculation.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127947003","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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