Pub Date : 1997-10-05DOI: 10.1109/ULTSYM.1997.661733
Stewart Sherrit, H. Wiederick, B. K. Mukherjee
Equivalent circuit models for unloaded piezoelectric vibrators are presented. The new circuit model includes terms which take into account the dielectric and piezoelectric loss as well as the mechanical loss found in the standard Van Dyke's model. The new model contains two branches, the motional branch and the static branch, like the Van Dyke's model. However there is no resistance element in the motional branch and the losses (mechanical, dielectric, piezoelectric) associated with the vibrator are represented as imaginary components of the remaining circuit elements (C/sub 0/, C/sub 1/, L/sub 1/). The model produced impedance curves that very closely matched the impedance calculated by using the equation derived from vibration theory and data from lead zirconate titanate and PVDF copolymer samples. The calculation of the circuit parameters C/sub 0/, C/sub 1/, and L/sub 1/ from the complex elastic, dielectric and piezoelectric material constants is straightforward and the model accurately represents the impedance spectra about the fundamental resonance even when the mechanical Q of the resonator is as low as 2. Conversely, If the circuit parameters are known, the material constants including losses can be derived by straightforward calculations without the loss of any information.
{"title":"Accurate equivalent circuits for unloaded piezoelectric resonators","authors":"Stewart Sherrit, H. Wiederick, B. K. Mukherjee","doi":"10.1109/ULTSYM.1997.661733","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661733","url":null,"abstract":"Equivalent circuit models for unloaded piezoelectric vibrators are presented. The new circuit model includes terms which take into account the dielectric and piezoelectric loss as well as the mechanical loss found in the standard Van Dyke's model. The new model contains two branches, the motional branch and the static branch, like the Van Dyke's model. However there is no resistance element in the motional branch and the losses (mechanical, dielectric, piezoelectric) associated with the vibrator are represented as imaginary components of the remaining circuit elements (C/sub 0/, C/sub 1/, L/sub 1/). The model produced impedance curves that very closely matched the impedance calculated by using the equation derived from vibration theory and data from lead zirconate titanate and PVDF copolymer samples. The calculation of the circuit parameters C/sub 0/, C/sub 1/, and L/sub 1/ from the complex elastic, dielectric and piezoelectric material constants is straightforward and the model accurately represents the impedance spectra about the fundamental resonance even when the mechanical Q of the resonator is as low as 2. Conversely, If the circuit parameters are known, the material constants including losses can be derived by straightforward calculations without the loss of any information.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"6 1","pages":"931-935 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84379972","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.661736
F. Levassort, M. Lethiecq, L. Tran-Huu-Hue, W. Wolny
Fabrication process is described for transducer applications. The electro-mechanical characterization is performed on the fundamental resonance and the overtones up to 100 MHz. The frequency dependence of parameters is shown. Two transducers are simulated (center frequency of 65 MHz), with a K.L.M. model, to compare the performances obtained when using a piezoelectric copolymer and this MPT ceramic as active elements.
{"title":"High frequency properties of new fine-grained modified lead titanate ceramics [transducers]","authors":"F. Levassort, M. Lethiecq, L. Tran-Huu-Hue, W. Wolny","doi":"10.1109/ULTSYM.1997.661736","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661736","url":null,"abstract":"Fabrication process is described for transducer applications. The electro-mechanical characterization is performed on the fundamental resonance and the overtones up to 100 MHz. The frequency dependence of parameters is shown. Two transducers are simulated (center frequency of 65 MHz), with a K.L.M. model, to compare the performances obtained when using a piezoelectric copolymer and this MPT ceramic as active elements.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"14 5 Suppl 3 1","pages":"947-950 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84982850","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.663037
T. Vandahl, S. Klett, W. Buff
A special SAW device design, derived from conventional tapped delay lines and optimized for wireless interrogation as a two-terminal ID-tag and sensor, is presented. The working principle is based on superposition of the correlation signals of multiple apodized transducer pairs that are connected in parallel. In the device, every transducer (tap) works as both, receiver and transmitter. Design rules for calculating the apodization of multiple transducers for a given PSK-code sequence are discussed under consideration of second order effects. Optimization criteria for low-loss design of diffraction-compensated devices are addressed. Measurement results for designs with and without diffraction compensation are shown and device characteristics are derived from the results. The measured ID-tag samples were fabricated on a 128/spl deg/-YX-LiNbO/sub 3/ substrate to operate at 433.92 MHz.
{"title":"Multiple apodized self-correlating tapped delay line for ID-tag and sensor applications","authors":"T. Vandahl, S. Klett, W. Buff","doi":"10.1109/ULTSYM.1997.663037","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663037","url":null,"abstract":"A special SAW device design, derived from conventional tapped delay lines and optimized for wireless interrogation as a two-terminal ID-tag and sensor, is presented. The working principle is based on superposition of the correlation signals of multiple apodized transducer pairs that are connected in parallel. In the device, every transducer (tap) works as both, receiver and transmitter. Design rules for calculating the apodization of multiple transducers for a given PSK-code sequence are discussed under consideration of second order effects. Optimization criteria for low-loss design of diffraction-compensated devices are addressed. Measurement results for designs with and without diffraction compensation are shown and device characteristics are derived from the results. The measured ID-tag samples were fabricated on a 128/spl deg/-YX-LiNbO/sub 3/ substrate to operate at 433.92 MHz.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"41 1","pages":"349-354 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80857369","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.661811
P. Tsiganos, A. Fairhead
In this work the authors address some of the problems associated with the optimization of CW transducers to be used via the suprasternal notch window (SSN) to insonate the aortic arch. Firstly, the geometrical characteristics of the anatomical region of interest are evaluated. Secondly, based on these characteristics, the required interrogation field (RIF) is defined and used as a criterion for classifying the suitability of any probe used in this application. Thirdly, the interrogation fields of two commercial probes are evaluated based on this criterion. Finally, a design methodology is proposed and implemented for defining a source and receiver distribution that produces an interrogation field with improved coverage of the RIF.
{"title":"On the problem of CW Doppler transducer optimization for linear cardiac output measurement via the suprasternal notch","authors":"P. Tsiganos, A. Fairhead","doi":"10.1109/ULTSYM.1997.661811","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661811","url":null,"abstract":"In this work the authors address some of the problems associated with the optimization of CW transducers to be used via the suprasternal notch window (SSN) to insonate the aortic arch. Firstly, the geometrical characteristics of the anatomical region of interest are evaluated. Secondly, based on these characteristics, the required interrogation field (RIF) is defined and used as a criterion for classifying the suitability of any probe used in this application. Thirdly, the interrogation fields of two commercial probes are evaluated based on this criterion. Finally, a design methodology is proposed and implemented for defining a source and receiver distribution that produces an interrogation field with improved coverage of the RIF.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"155 1","pages":"1277-1280 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80997505","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.661858
O. Aristizábal, D. A. Christopher, F. Foster, D. H. Turnball
Extensive genetic information and the recent introduction of transgenic techniques for genetic manipulation have made the mouse the accepted model for normal cardiac development and congenital heart disease. An impediment to progress in this area has been the lack of noninvasive technologies to assess embryonic cardiovascular structure and function. The authors have developed a high frequency (40-50 MHz) ultrasound imaging and Doppler system enabling in vivo analysis of early embryonic cardiovascular development in the mouse. Simultaneous real-time image and Doppler data can be obtained noninvasively allowing, for the first time, measurements to be made of inflow and outflow characteristics of the mouse embryo heart and blood flow in the umbilical circulation. High resolution (measured lateral resolution=60-100 /spl mu/m) images are used to position the sample volume of the Doppler transducers. The 40 MHz CW Doppler system utilizes a pair of air backed LiNbO/sub 3/ transducers mounted on SMB connectors, and has been calibrated with a string phantom from 10 to 300 mm/s, velocities relevant to embryonic cardiovascular blood waveforms. Biphasic inflow waveforms were measured in normal 10 day mouse embryos (approximately equivalent to 4 weeks human) with peak blood velocities close to 200 mm/s. Outflow velocities in the same embryos were close to 70 mm/s while umbilical artery velocities were approximately 20 mm/s. Future studies will compare normal velocity data to measurements of mutant mice with specific defects in heart and placenta.
{"title":"Measuring blood flow in the mouse embryo","authors":"O. Aristizábal, D. A. Christopher, F. Foster, D. H. Turnball","doi":"10.1109/ULTSYM.1997.661858","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661858","url":null,"abstract":"Extensive genetic information and the recent introduction of transgenic techniques for genetic manipulation have made the mouse the accepted model for normal cardiac development and congenital heart disease. An impediment to progress in this area has been the lack of noninvasive technologies to assess embryonic cardiovascular structure and function. The authors have developed a high frequency (40-50 MHz) ultrasound imaging and Doppler system enabling in vivo analysis of early embryonic cardiovascular development in the mouse. Simultaneous real-time image and Doppler data can be obtained noninvasively allowing, for the first time, measurements to be made of inflow and outflow characteristics of the mouse embryo heart and blood flow in the umbilical circulation. High resolution (measured lateral resolution=60-100 /spl mu/m) images are used to position the sample volume of the Doppler transducers. The 40 MHz CW Doppler system utilizes a pair of air backed LiNbO/sub 3/ transducers mounted on SMB connectors, and has been calibrated with a string phantom from 10 to 300 mm/s, velocities relevant to embryonic cardiovascular blood waveforms. Biphasic inflow waveforms were measured in normal 10 day mouse embryos (approximately equivalent to 4 weeks human) with peak blood velocities close to 200 mm/s. Outflow velocities in the same embryos were close to 70 mm/s while umbilical artery velocities were approximately 20 mm/s. Future studies will compare normal velocity data to measurements of mutant mice with specific defects in heart and placenta.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"13 1","pages":"1489-1492 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79526640","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.663297
W. Shi, F. Forsberg, H. Oung
Gaseous contrast agents can be used to enhance conventional Doppler measurements and to create new harmonic Doppler modalities. The effect of bubble destruction on both conventional and harmonic Doppler spectra was studied using an in vitro, pulsatile flow system. Similar spectrograms were observed for low levels of insonification (below 0.62 MPa) in both conventional and harmonic Doppler measurements of the same flow. As the acoustic output was increased (up to 1.8 MPa) the spectrograms showed marked spectral broadening, especially for harmonic Doppler. The spectral broadening was caused by transit time effects resulting from the destruction of insonated bubbles. This finding was confirmed by performing a similar experiment on stationary polymer-coated microbubbles suspended in a gel phantom. In conclusion, the effect of bubble destruction should be taken into account in both conventional and harmonic Doppler measurements with gaseous contrast agents.
{"title":"Spectral broadening in conventional and harmonic Doppler measurements with gaseous contrast agents","authors":"W. Shi, F. Forsberg, H. Oung","doi":"10.1109/ULTSYM.1997.663297","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663297","url":null,"abstract":"Gaseous contrast agents can be used to enhance conventional Doppler measurements and to create new harmonic Doppler modalities. The effect of bubble destruction on both conventional and harmonic Doppler spectra was studied using an in vitro, pulsatile flow system. Similar spectrograms were observed for low levels of insonification (below 0.62 MPa) in both conventional and harmonic Doppler measurements of the same flow. As the acoustic output was increased (up to 1.8 MPa) the spectrograms showed marked spectral broadening, especially for harmonic Doppler. The spectral broadening was caused by transit time effects resulting from the destruction of insonated bubbles. This finding was confirmed by performing a similar experiment on stationary polymer-coated microbubbles suspended in a gel phantom. In conclusion, the effect of bubble destruction should be taken into account in both conventional and harmonic Doppler measurements with gaseous contrast agents.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"3 1","pages":"1575-1578 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85825160","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.663017
H. Odagawa, Takeshi Matsumura, K. Yamanouchi
This paper describes a super high electromechanical coupling SAW propagating on potassium niobate (KNbO/sub 3/) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO/sub 3/ has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K/sup 2/) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO/sub 3/. Moreover, we obtained the zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2/spl sim/6 dB. Simulation result of ladder type filter using Y-cut KNbO/sub 3/, shows the bandwidth of 40%.
{"title":"Super high electromechanical coupling and zero-temperature characteristics of KNbO/sub 3/ and its applications for low-loss wide band filters","authors":"H. Odagawa, Takeshi Matsumura, K. Yamanouchi","doi":"10.1109/ULTSYM.1997.663017","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663017","url":null,"abstract":"This paper describes a super high electromechanical coupling SAW propagating on potassium niobate (KNbO/sub 3/) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO/sub 3/ has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K/sup 2/) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO/sub 3/. Moreover, we obtained the zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2/spl sim/6 dB. Simulation result of ladder type filter using Y-cut KNbO/sub 3/, shows the bandwidth of 40%.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"321 1","pages":"235-238 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78011029","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.663034
K. Yamanouchi, H. Odagawa, K. Morozumi, Y. Cho
Elastic convolvers are very important for signal processing devices of the spread spectrum communication (SSC) systems. The better efficient convolvers are required for the application for the spread spectrum and next stage communication systems. A high value of coupling coefficient is very important for wideband and high efficiency SAW devices such as SAW convolvers. Potassium niobate (KNbO/sub 3/) has large piezoelectric constants and very large electromechanical coupling coefficient (K/sup 2/) of 0.53 for the surface acoustic waves which is about 10 times larger than that of LiNbO/sub 3/. Therefore the high efficient elastic SAW convolvers using KNbO/sub 3/ substrates are expected. In this paper, the rotated 60/spl deg/ Y-cut, X-propagating KNbO/sub 3/ substrates are used for a convolver. The experimental results show that the efficiency of the convolver using 60 /spl deg/Y-X KNbO/sub 3/ is 15 dB higher than of he convolver using Y-Z LiNbO/sub 3/.
{"title":"High efficiency elastic convolver using KNbO/sub 3/ substrate","authors":"K. Yamanouchi, H. Odagawa, K. Morozumi, Y. Cho","doi":"10.1109/ULTSYM.1997.663034","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663034","url":null,"abstract":"Elastic convolvers are very important for signal processing devices of the spread spectrum communication (SSC) systems. The better efficient convolvers are required for the application for the spread spectrum and next stage communication systems. A high value of coupling coefficient is very important for wideband and high efficiency SAW devices such as SAW convolvers. Potassium niobate (KNbO/sub 3/) has large piezoelectric constants and very large electromechanical coupling coefficient (K/sup 2/) of 0.53 for the surface acoustic waves which is about 10 times larger than that of LiNbO/sub 3/. Therefore the high efficient elastic SAW convolvers using KNbO/sub 3/ substrates are expected. In this paper, the rotated 60/spl deg/ Y-cut, X-propagating KNbO/sub 3/ substrates are used for a convolver. The experimental results show that the efficiency of the convolver using 60 /spl deg/Y-X KNbO/sub 3/ is 15 dB higher than of he convolver using Y-Z LiNbO/sub 3/.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"48 1","pages":"335-338 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79929796","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.662979
M.E. Woodberry, W. Hunt
The aging characteristics of a longitudinally coupled SAW resonator on 64/spl deg/ LiNbO/sub 3/ are examined. The aging of these devices was accelerated by applying a high RF power until catastrophic failure occurred. The insertion was measured while the devices were being aged. A LabView program was used to automate equipment control and data acquisition during the experiment. After the devices had been tested, damage to the electrode metalization was observed using both optical and scanning electron microscopy. The observed damage included acoustically-induced metal migration and substrate damage. A device that had not been aged was laser probed to record the distribution of acoustic power across the device. The relation between the distribution of acoustic power and damage to the electrode metalization is discussed.
{"title":"Investigation of accelerated aging characteristics of a SAW filter","authors":"M.E. Woodberry, W. Hunt","doi":"10.1109/ULTSYM.1997.662979","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.662979","url":null,"abstract":"The aging characteristics of a longitudinally coupled SAW resonator on 64/spl deg/ LiNbO/sub 3/ are examined. The aging of these devices was accelerated by applying a high RF power until catastrophic failure occurred. The insertion was measured while the devices were being aged. A LabView program was used to automate equipment control and data acquisition during the experiment. After the devices had been tested, damage to the electrode metalization was observed using both optical and scanning electron microscopy. The observed damage included acoustically-induced metal migration and substrate damage. A device that had not been aged was laser probed to record the distribution of acoustic power across the device. The relation between the distribution of acoustic power and damage to the electrode metalization is discussed.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"53 1","pages":"55-60 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80424037","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 : 1997-10-05DOI: 10.1109/ULTSYM.1997.661745
I. Ladabaum, X. Jin, B. Khuri-Yakub
The air-coupled transmission of 2.3 MHz longitudinal ultrasonic waves through aluminum is reported. Microfabricated ultrasonic transducers are used to emit and receive the ultrasonic tone burst. The signal at the receiver is 30 dB above the noise floor, which implies a dynamic range of approximately 110 dB. The dynamic range is independently verified, and transmission through steel is also demonstrated. Air-coupled NDE scans of lucite plates are presented. An optimized fabrication process, based on theoretical understanding of the transducers, enables the experiments. Significant progress in the fabrication of immersion MUTs is also in evidence. An insertion loss of 4 dB is reported and transmission experiments show 100 dB of dynamic range with 100% bandwidth.
{"title":"Air coupled through transmission of aluminum and other recent results using MUTs","authors":"I. Ladabaum, X. Jin, B. Khuri-Yakub","doi":"10.1109/ULTSYM.1997.661745","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661745","url":null,"abstract":"The air-coupled transmission of 2.3 MHz longitudinal ultrasonic waves through aluminum is reported. Microfabricated ultrasonic transducers are used to emit and receive the ultrasonic tone burst. The signal at the receiver is 30 dB above the noise floor, which implies a dynamic range of approximately 110 dB. The dynamic range is independently verified, and transmission through steel is also demonstrated. Air-coupled NDE scans of lucite plates are presented. An optimized fabrication process, based on theoretical understanding of the transducers, enables the experiments. Significant progress in the fabrication of immersion MUTs is also in evidence. An insertion loss of 4 dB is reported and transmission experiments show 100 dB of dynamic range with 100% bandwidth.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"45 1","pages":"983-986 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81403080","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：