Pub Date : 1997-10-05DOI: 10.1109/ULTSYM.1997.662983
B. Sveshnikov, A. Shitvov
Resonant coupling between two non-waveguide acoustic channels is considered and analyzed in detail. A pair of electrically parallel, while placed in different channels, single-phase unidirectional transducers, loaded by matching inductance, may be used in order to fold the SAW propagation path. Such a possibility provides the additional degree of freedom in the design of SAW filters, being applicable even to weak piezocrystal cuts. Some device architectures are examined to demonstrate possible significant improvement of filter selectivity. It's shown that this aim may be achieved even when using unweighted SPUDTs by proper combinations of reflectivity and lengths of transducers and reflectors placed within each a channel. Influence of re-radiator's load on the filter performances is illustrated too.
{"title":"SPUDT-based tunable resonant coupling of different acoustic channels","authors":"B. Sveshnikov, A. Shitvov","doi":"10.1109/ULTSYM.1997.662983","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.662983","url":null,"abstract":"Resonant coupling between two non-waveguide acoustic channels is considered and analyzed in detail. A pair of electrically parallel, while placed in different channels, single-phase unidirectional transducers, loaded by matching inductance, may be used in order to fold the SAW propagation path. Such a possibility provides the additional degree of freedom in the design of SAW filters, being applicable even to weak piezocrystal cuts. Some device architectures are examined to demonstrate possible significant improvement of filter selectivity. It's shown that this aim may be achieved even when using unweighted SPUDTs by proper combinations of reflectivity and lengths of transducers and reflectors placed within each a channel. Influence of re-radiator's load on the filter performances is illustrated too.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"22 1","pages":"73-76 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84053601","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.1997.662981
V. B. Chvets, P. G. Ivanov, V. M. Makarov, V. S. Orlov
Transversal filters with very high shape factor have been developed based on multiharmonic and withdrawal weighted transducers with isolated sections. The developed simulation technique provides excellent results both for in-line filter structures and those with multistrip couplers. The experimental results are presented for IF filters manufactured on YZ-LiNbO/sub 3/ and ST-quartz substrates. In-line filters exhibit SF in the range 1.15-1.2 and for MSC filters, SF values 1.05-1.1 have been obtained. For all filters the stopband rejection is more than 50 dB.
{"title":"SAW filters with very high shape factor","authors":"V. B. Chvets, P. G. Ivanov, V. M. Makarov, V. S. Orlov","doi":"10.1109/ULTSYM.1997.662981","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.662981","url":null,"abstract":"Transversal filters with very high shape factor have been developed based on multiharmonic and withdrawal weighted transducers with isolated sections. The developed simulation technique provides excellent results both for in-line filter structures and those with multistrip couplers. The experimental results are presented for IF filters manufactured on YZ-LiNbO/sub 3/ and ST-quartz substrates. In-line filters exhibit SF in the range 1.15-1.2 and for MSC filters, SF values 1.05-1.1 have been obtained. For all filters the stopband rejection is more than 50 dB.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"28 1","pages":"65-68 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84460214","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.1997.663088
D. Xi
In this article we have studied resonant second-harmonic generation accompanying nonlinear Love-wave propagation in an isotropic waveguide consisting of a solid layer and a semi-infinite solid. Generally, the amplitude of the second harmonic arising from the self-interaction of shear wave is independent of propagation distance, i.e., there is no effect of cumulative growth. However, for Love-wave propagation case, there are two shear partial waves in the solid layer deposited on the semi-infinite solid, and the cross-interaction between two shear waves may cause the "resonance" of the driving second harmonic once the phase velocity of the Love-wave equals the longitudinal velocity of the solid layer. Through second-harmonic boundary conditions and initial conditions of excitation, we formally obtain the analytical expressions for the case of resonant second-harmonic generation. The present analysis yields clearly physical insight into the process of resonant second-harmonic generation accompanying nonlinear Love-wave propagation not previously available.
{"title":"Resonant second-harmonic generation accompanying nonlinear Love-wave propagation in an isotropic waveguide","authors":"D. Xi","doi":"10.1109/ULTSYM.1997.663088","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663088","url":null,"abstract":"In this article we have studied resonant second-harmonic generation accompanying nonlinear Love-wave propagation in an isotropic waveguide consisting of a solid layer and a semi-infinite solid. Generally, the amplitude of the second harmonic arising from the self-interaction of shear wave is independent of propagation distance, i.e., there is no effect of cumulative growth. However, for Love-wave propagation case, there are two shear partial waves in the solid layer deposited on the semi-infinite solid, and the cross-interaction between two shear waves may cause the \"resonance\" of the driving second harmonic once the phase velocity of the Love-wave equals the longitudinal velocity of the solid layer. Through second-harmonic boundary conditions and initial conditions of excitation, we formally obtain the analytical expressions for the case of resonant second-harmonic generation. The present analysis yields clearly physical insight into the process of resonant second-harmonic generation accompanying nonlinear Love-wave propagation not previously available.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"21 1","pages":"577-580 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85367497","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.1997.661770
A. Saied, B. Dehecq, M. Savoldelli, B. Briat, J. Legeais, G. Berger
In a previous preliminary study the authors have shown that 50 MHz ultrasound microscope coupled with the spectral analysis of radio frequency signal enable the imaging and evaluation of the biointegration of polymer implants used as support of keratoprosthesis (artificial cornea). In particular, the authors have demonstrated that the level of apparent backscatter was sensitive to the change in the polymer pore content (fluid or cells). In the current study, a larger number of polymer implants (n=21) at different colonization stages were explored in vitro and the authors investigated the potential of the frequency variation of both ultrasonic backscatter and attenuation coefficients to control and assess in situ the progressive biocolonization of the material. Quantitative echographic findings were correlated to histologic data which established the cell density in each specimen.
{"title":"Evaluation of keratoprosthesis biointegration in situ with quantitative ultrasound backscatter microscopy","authors":"A. Saied, B. Dehecq, M. Savoldelli, B. Briat, J. Legeais, G. Berger","doi":"10.1109/ULTSYM.1997.661770","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661770","url":null,"abstract":"In a previous preliminary study the authors have shown that 50 MHz ultrasound microscope coupled with the spectral analysis of radio frequency signal enable the imaging and evaluation of the biointegration of polymer implants used as support of keratoprosthesis (artificial cornea). In particular, the authors have demonstrated that the level of apparent backscatter was sensitive to the change in the polymer pore content (fluid or cells). In the current study, a larger number of polymer implants (n=21) at different colonization stages were explored in vitro and the authors investigated the potential of the frequency variation of both ultrasonic backscatter and attenuation coefficients to control and assess in situ the progressive biocolonization of the material. Quantitative echographic findings were correlated to histologic data which established the cell density in each specimen.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"33 1","pages":"1093-1096 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85501562","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.1997.663048
B. Tittmann, R. Lerch, H. Landes, S. Madden, H. Tavossi
This paper describes the FEM-BEM simulation of and measurements on an acoustic transmission line consisting of three connected components; a long thin tube, a narrow solid cylinder, and a long narrow column of water. The total path length corresponded to about 8500 wavelengths at the highest frequency used, 5 MHz. Applications for this topic are in the field of high resolution ranging and is particularly important in leadscrew position measurement, where high precision over long travel lengths are required. The new aspects of this study lie firstly, in the development of special hybrid FEM-BEM simulation techniques to handle the extremely long lengths, secondly in the optimum choice of waveguide modes, and thirdly in the details of the experimental measurements, especially, when applied to industrial leadscrew position detection. Current techniques for measuring leadscrew positions are based on electromagnetic sensors and give a range resolution of only about 10 mm. The ultrasonic range detection provided a precision of 1 mm.
{"title":"Wave propagation in long compound acoustic transmission line: numerical simulation and measurement","authors":"B. Tittmann, R. Lerch, H. Landes, S. Madden, H. Tavossi","doi":"10.1109/ULTSYM.1997.663048","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663048","url":null,"abstract":"This paper describes the FEM-BEM simulation of and measurements on an acoustic transmission line consisting of three connected components; a long thin tube, a narrow solid cylinder, and a long narrow column of water. The total path length corresponded to about 8500 wavelengths at the highest frequency used, 5 MHz. Applications for this topic are in the field of high resolution ranging and is particularly important in leadscrew position measurement, where high precision over long travel lengths are required. The new aspects of this study lie firstly, in the development of special hybrid FEM-BEM simulation techniques to handle the extremely long lengths, secondly in the optimum choice of waveguide modes, and thirdly in the details of the experimental measurements, especially, when applied to industrial leadscrew position detection. Current techniques for measuring leadscrew positions are based on electromagnetic sensors and give a range resolution of only about 10 mm. The ultrasonic range detection provided a precision of 1 mm.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"2 1","pages":"401-404 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75590083","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.1997.663306
K. Erikson, A. Hairston, A. Nicoli, J. Stockwell, T. White
Ultrasonic imaging in the low MHz frequency range with large, dense arrays presents many design and fabrication challenges. Conventional ultrasound systems use micro-coaxial cable to connect the array to the front end electronics. While coax technology has improved dramatically in the past decade, interconnecting 16384 array elements with separate wires remains a formidable challenge. In addition to this practical issue, the capacitance of a long coaxial cable (/spl sim/40 pF/m) is much larger than that of a typical 2D array element (<1 pF), creating a voltage divider that severely reduces the signal-to-noise ratio of the channel. A 2D composite piezoelectric receiver array bonded directly to four large custom integrated circuits is described. This 128/spl times/128 (16384 total) element Transducer Hybrid Array (THA) of 200 /spl mu/m unit cell spacing is intended for a 3D real-time imaging system for medical and underwater applications. By reducing the interconnect length to less than 20 /spl mu/m, cable capacitance is no longer a problem. Massively parallel, on-chip signal processing enables true real-time three-dimensional imaging. Favorable tradeoffs using composite piezoelectric materials, enabled by this high-density flip-chip interconnection technology are discussed.
{"title":"A 128/spl times/128 ultrasonic transducer hybrid array","authors":"K. Erikson, A. Hairston, A. Nicoli, J. Stockwell, T. White","doi":"10.1109/ULTSYM.1997.663306","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663306","url":null,"abstract":"Ultrasonic imaging in the low MHz frequency range with large, dense arrays presents many design and fabrication challenges. Conventional ultrasound systems use micro-coaxial cable to connect the array to the front end electronics. While coax technology has improved dramatically in the past decade, interconnecting 16384 array elements with separate wires remains a formidable challenge. In addition to this practical issue, the capacitance of a long coaxial cable (/spl sim/40 pF/m) is much larger than that of a typical 2D array element (<1 pF), creating a voltage divider that severely reduces the signal-to-noise ratio of the channel. A 2D composite piezoelectric receiver array bonded directly to four large custom integrated circuits is described. This 128/spl times/128 (16384 total) element Transducer Hybrid Array (THA) of 200 /spl mu/m unit cell spacing is intended for a 3D real-time imaging system for medical and underwater applications. By reducing the interconnect length to less than 20 /spl mu/m, cable capacitance is no longer a problem. Massively parallel, on-chip signal processing enables true real-time three-dimensional imaging. Favorable tradeoffs using composite piezoelectric materials, enabled by this high-density flip-chip interconnection technology are discussed.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"115 1","pages":"1625-1629 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79192557","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.1997.663044
B. Zaitsev, V. Kunetsova, S. Joshi
This paper is concerned with the influence of a viscous liquid on the propagation of acoustic waves in thin plates of lithium niobate. The characteristics of the three lowest order wave modes that such a plate can support (zeroth order antisymmetric Lamb wave A/sub 0/, symmetric Lamb wave S/sub 6/, and quasi-shear-horizontal wave QSH/sub 6/) are investigated. It is assumed that the liquid is isotropic such that its viscous properties are described by two independent components of viscosity tensor /spl eta//sub 11/ and /spl eta//sub 44/. It is found that the attenuation of the waves depends primarily on the shear component of viscosity /spl eta//sub 44/. The influence of expansion component /spl eta//sub 11/ is negligible. The attenuation per unit length is proportional to (/spl eta//sub 44/)/sup 1/2 / and f/sup 1,3/, where f is the frequency of the wave. Under identical conditions, the lowest value of attenuation is for the S/sub 0/ mode, while the highest is for the A/sub 0/ mode. For example, for h//spl lambda/=0.025 (h=plate thickness, /spl lambda/=acoustic wavelength) and /spl eta//sub 44/=0.003 Ns/m/sup 2/, the attenuation in dB/cm at a frequency of 1 MHz for A/sub 0/, S/sub 0/ and QSH/sub 0/ modes is 13.5, 0.024, and 0.073, respectively. The above results indicate that the S/sub 0/ wave is most suitable for use in devices operating in contact with a viscous liquid. The results also show that by using the three different wave modes, one can develop a viscosity meter with a very wide measurable range of viscosity.
{"title":"Propagation of acoustic waves in plates bordered with viscous liquid","authors":"B. Zaitsev, V. Kunetsova, S. Joshi","doi":"10.1109/ULTSYM.1997.663044","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663044","url":null,"abstract":"This paper is concerned with the influence of a viscous liquid on the propagation of acoustic waves in thin plates of lithium niobate. The characteristics of the three lowest order wave modes that such a plate can support (zeroth order antisymmetric Lamb wave A/sub 0/, symmetric Lamb wave S/sub 6/, and quasi-shear-horizontal wave QSH/sub 6/) are investigated. It is assumed that the liquid is isotropic such that its viscous properties are described by two independent components of viscosity tensor /spl eta//sub 11/ and /spl eta//sub 44/. It is found that the attenuation of the waves depends primarily on the shear component of viscosity /spl eta//sub 44/. The influence of expansion component /spl eta//sub 11/ is negligible. The attenuation per unit length is proportional to (/spl eta//sub 44/)/sup 1/2 / and f/sup 1,3/, where f is the frequency of the wave. Under identical conditions, the lowest value of attenuation is for the S/sub 0/ mode, while the highest is for the A/sub 0/ mode. For example, for h//spl lambda/=0.025 (h=plate thickness, /spl lambda/=acoustic wavelength) and /spl eta//sub 44/=0.003 Ns/m/sup 2/, the attenuation in dB/cm at a frequency of 1 MHz for A/sub 0/, S/sub 0/ and QSH/sub 0/ modes is 13.5, 0.024, and 0.073, respectively. The above results indicate that the S/sub 0/ wave is most suitable for use in devices operating in contact with a viscous liquid. The results also show that by using the three different wave modes, one can develop a viscosity meter with a very wide measurable range of viscosity.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"17 1","pages":"381-384 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82138540","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.1997.663314
T. R. Gururaja, A. Shurland, J. Chen
We present a novel type of ultrasonic imaging transducer in which the operating frequency can be switched between two distinct bands centered about f/sub 0/ and 2f/sub 0/. In effect, we can achieve greater than 100% transducer bandwidth at the -6 dB level. The transducer is based on using DC bias induced piezoelectricity in electrostrictive materials such as lead magnesium niobate-lead titanate (PMN-PT) relaxor ferroelectric materials.
{"title":"Medical ultrasonic transducers with switchable frequency bands centered about f/sub 0/ and 2f/sub 0/","authors":"T. R. Gururaja, A. Shurland, J. Chen","doi":"10.1109/ULTSYM.1997.663314","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663314","url":null,"abstract":"We present a novel type of ultrasonic imaging transducer in which the operating frequency can be switched between two distinct bands centered about f/sub 0/ and 2f/sub 0/. In effect, we can achieve greater than 100% transducer bandwidth at the -6 dB level. The transducer is based on using DC bias induced piezoelectricity in electrostrictive materials such as lead magnesium niobate-lead titanate (PMN-PT) relaxor ferroelectric materials.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"1 1","pages":"1659-1662 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78844571","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.1997.661789
N. Kudo, T. Kamataki, K. Yamamoto, H. Onozuka, T. Mikami, A. Kitabatake, Y. Ito, H. Kanda
The authors developed a measurement system of ultrasound attenuation in the frequency range of 2.5 to 40 MHz and measured the ultrasound attenuation coefficients of normal, infarcted, and dilated cardiomyopathy samples of a human formalized myocardium. Results of attenuation measurements showed that the attenuation coefficients increased proportionally to the n-th power of frequency in the measured frequency range. Attenuation coefficients in the myocardium specimens increased proportionally to the 1.3 power for the infarction and 1.2 power for the dilated cardiomyopathy of frequency, respectively, while the attenuation coefficient increased proportionally to the 1.6 power for the normal myocardium. These results suggest that an exponent of frequency-dependent attenuation could be used as an index of tissue characterization.
{"title":"Ultrasound attenuation measurement of tissue in frequency range 2.5-40 MHz using a multi-resonance transducer","authors":"N. Kudo, T. Kamataki, K. Yamamoto, H. Onozuka, T. Mikami, A. Kitabatake, Y. Ito, H. Kanda","doi":"10.1109/ULTSYM.1997.661789","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661789","url":null,"abstract":"The authors developed a measurement system of ultrasound attenuation in the frequency range of 2.5 to 40 MHz and measured the ultrasound attenuation coefficients of normal, infarcted, and dilated cardiomyopathy samples of a human formalized myocardium. Results of attenuation measurements showed that the attenuation coefficients increased proportionally to the n-th power of frequency in the measured frequency range. Attenuation coefficients in the myocardium specimens increased proportionally to the 1.3 power for the infarction and 1.2 power for the dilated cardiomyopathy of frequency, respectively, while the attenuation coefficient increased proportionally to the 1.6 power for the normal myocardium. These results suggest that an exponent of frequency-dependent attenuation could be used as an index of tissue characterization.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"18 1","pages":"1181-1184 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80932460","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.1997.663041
L. Scandelari, N. Noury, P. Benech, E. Chamberod
We present the temperature-dependent characteristics of a Lamb wave device used as a liquid density sensor. Its fabrication process was simplified using a P(VF/sub 2/-VF/sub 3/) film stuck on a non-piezoelectric medium. The lowest order antisymmetric Lamb waves (A/sub 0/ mode) are used for measurements. We measured the phase and group velocities of the waves for different concentrations of NaCl and we analyzed the temperature dependent performance of our device. The synchronism frequency decreases almost 1.4 kHz per Celsius degree increase. Insertion loss decreases with increasing temperature.
{"title":"Temperature-dependent characteristics of a density sensor based on Lamb waves generated with a P(VF/sub 2/-VF/sub 3/) film","authors":"L. Scandelari, N. Noury, P. Benech, E. Chamberod","doi":"10.1109/ULTSYM.1997.663041","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663041","url":null,"abstract":"We present the temperature-dependent characteristics of a Lamb wave device used as a liquid density sensor. Its fabrication process was simplified using a P(VF/sub 2/-VF/sub 3/) film stuck on a non-piezoelectric medium. The lowest order antisymmetric Lamb waves (A/sub 0/ mode) are used for measurements. We measured the phase and group velocities of the waves for different concentrations of NaCl and we analyzed the temperature dependent performance of our device. The synchronism frequency decreases almost 1.4 kHz per Celsius degree increase. Insertion loss decreases with increasing temperature.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"32 1","pages":"367-370 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90287011","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：