A SAW strain sensor with new simplified Epoxy-Quartz packaging is analyzed in this paper. The strain sensitivity of sensors with Epoxy-Quartz Package is calculated with perturbation theory and finite element method theoretically. The sensitivity is close to the sensitivities of traditional AQP, which are 3.20 ppm / με and 3.32 ppm / με respectively. Then an Epoxy-Quartz Packaged 433MHz SAW strain sensor is fabricated by using the epoxy EP-4 adhesive. An experimental platform is set up and the strain sensitivity of Epoxy-Quartz Packaged is measured at 20 °C. The experimental results indicate that strain sensitivity of Epoxy-Quartz Packaged is 2.51 ppm / με, which almost agrees with theoretical results. Therefore, a new simplified package for SAW strain sensor with a relatively high strain sensitivity is verified in this paper.
{"title":"Strain Sensitivity of Epoxy-Quartz Packaged Saw Strain Sensors","authors":"Pengfei Li, Hong-lang Li, Li-na Cheng, Yabing Ke, Yahui Tian","doi":"10.1109/SPAWDA48812.2019.9019238","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019238","url":null,"abstract":"A SAW strain sensor with new simplified Epoxy-Quartz packaging is analyzed in this paper. The strain sensitivity of sensors with Epoxy-Quartz Package is calculated with perturbation theory and finite element method theoretically. The sensitivity is close to the sensitivities of traditional AQP, which are 3.20 ppm / με and 3.32 ppm / με respectively. Then an Epoxy-Quartz Packaged 433MHz SAW strain sensor is fabricated by using the epoxy EP-4 adhesive. An experimental platform is set up and the strain sensitivity of Epoxy-Quartz Packaged is measured at 20 °C. The experimental results indicate that strain sensitivity of Epoxy-Quartz Packaged is 2.51 ppm / με, which almost agrees with theoretical results. Therefore, a new simplified package for SAW strain sensor with a relatively high strain sensitivity is verified in this paper.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133979545","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019323
Jianzu Gu, Bin Zhang, Rui-Xiang Su, Lei Qian, Rong Chen
With the development of ultrasonic technology, ultrasonic wave plays an increasingly important role in the field of nondestructive testing. Among all kinds of ultrasonic nondestructive testing technologie, ultrasonic phased array is widely used because of its high accuracy and flexibility. However, due to the existence of rayleigh limit, ordinary ultrasonic phased array technology cannot recover the space frequency greater than 2K, so it is impossible to achieve the resolution less than half of the wavelengthof the super-resolution. In this paper, we introduce a method to realize super resolution imaging in multi-band phased array.In this method, the damage is detected by multiple phased arrays, and the received signals are processed by specific algorithms to obtain super-resolution imaging. The signal is excited by M exciter and then received by N receiver. The total signal can form an M*N matrix. After singular valuedecomposition of the collected signal matrix,T significant eigenvalues can be obtained. The T significant eigenvalues represent the number of injuries. The singular vector after singular value decomposition contains the information of noise space. The number of eigenvalues in the signal space is the number of damage. Using the randomness of noise subspace, special algorithm can be used to restore the spatial frequency greater than 2K to achieve super-resolution imaging.The more elements in this method, the more accurate and complicated it is. As long as the smallest value of M and N is greater than the number of injuries, each injury can be successfully distinguished under super resolution. Therefore, the appropriate number of matrix elements should be selected for different damages.
{"title":"Ultrasonic Phased Array Imaging Method Based On Multi - Scattering Model","authors":"Jianzu Gu, Bin Zhang, Rui-Xiang Su, Lei Qian, Rong Chen","doi":"10.1109/SPAWDA48812.2019.9019323","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019323","url":null,"abstract":"With the development of ultrasonic technology, ultrasonic wave plays an increasingly important role in the field of nondestructive testing. Among all kinds of ultrasonic nondestructive testing technologie, ultrasonic phased array is widely used because of its high accuracy and flexibility. However, due to the existence of rayleigh limit, ordinary ultrasonic phased array technology cannot recover the space frequency greater than 2K, so it is impossible to achieve the resolution less than half of the wavelengthof the super-resolution. In this paper, we introduce a method to realize super resolution imaging in multi-band phased array.In this method, the damage is detected by multiple phased arrays, and the received signals are processed by specific algorithms to obtain super-resolution imaging. The signal is excited by M exciter and then received by N receiver. The total signal can form an M*N matrix. After singular valuedecomposition of the collected signal matrix,T significant eigenvalues can be obtained. The T significant eigenvalues represent the number of injuries. The singular vector after singular value decomposition contains the information of noise space. The number of eigenvalues in the signal space is the number of damage. Using the randomness of noise subspace, special algorithm can be used to restore the spatial frequency greater than 2K to achieve super-resolution imaging.The more elements in this method, the more accurate and complicated it is. As long as the smallest value of M and N is greater than the number of injuries, each injury can be successfully distinguished under super resolution. Therefore, the appropriate number of matrix elements should be selected for different damages.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132152787","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019315
Qiang Wang, Jie Mao, Guoxuan Lian
The difficulty of detecting the thickness of steel layer under high attenuation rubber mainly includes the signal-to-noise ratio and axial resolution. The ultrasonic chirp-coded excitation method with attenuation matching can obtain higher signal-to-noise ratio gain at the expense of axial resolution. However, the wider main lobe and the primary echo of rubber steel interface will seriously interfere with the judgment of steel thickness. In order to solve this problem, sparse deconvolution can be used to improve the resolution of echo based on the attenuation matching method. The results show that the signal-to-noise ratio gain brought by the attenuation matching method is conducive to the echo recognition of sparse deconvolution, and the design scheme of wavelet considering attenuation can obtain better deconvolution effect.
{"title":"Identification of Ultrasonic Overlapped Signals based on Attenuation Matching and Sparse Deconvolution","authors":"Qiang Wang, Jie Mao, Guoxuan Lian","doi":"10.1109/SPAWDA48812.2019.9019315","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019315","url":null,"abstract":"The difficulty of detecting the thickness of steel layer under high attenuation rubber mainly includes the signal-to-noise ratio and axial resolution. The ultrasonic chirp-coded excitation method with attenuation matching can obtain higher signal-to-noise ratio gain at the expense of axial resolution. However, the wider main lobe and the primary echo of rubber steel interface will seriously interfere with the judgment of steel thickness. In order to solve this problem, sparse deconvolution can be used to improve the resolution of echo based on the attenuation matching method. The results show that the signal-to-noise ratio gain brought by the attenuation matching method is conducive to the echo recognition of sparse deconvolution, and the design scheme of wavelet considering attenuation can obtain better deconvolution effect.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133091335","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019309
Changda Wang, Yingjie Zhang, P. Wei, Yueqiu Li
The reflection and transmission of the thermos-elastic coupled waves across a slab of finite thickness that is sandwiched between two semi-infinite homogeneous isotropic couple stress elastic solids are studied. Based on the modified couple-stress theory and the Green-Lindsay theory, the governing equations of the thermoeleastic wave propagation are derived. Different from the classic elastic solid, the interface conditions involve the micro-rotation and the surface couple. The nontraditional interface conditions between the slab and two half-spaces are used to obtain the linear algebraic equations set from which the amplitude ratios of reflection and transmission waves can be determined. Then, the energy fluxes carried by reflection and transmission waves are calculated numerically and the normal energy flux conservation is used to validate the numerical results. At last, the influences of two thermal relaxation times are discussed based on the numerical results. It is found that the thermos-elastic coupling makes the longitudinal wave and the thermal wave not only dispersive but also attenuated, and the thermal wave effect mainly affects the dilatational waves.
{"title":"Reflection and Transmission of Thermoelastic Waves Through a Sandwiched Slab with Couple Stress","authors":"Changda Wang, Yingjie Zhang, P. Wei, Yueqiu Li","doi":"10.1109/SPAWDA48812.2019.9019309","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019309","url":null,"abstract":"The reflection and transmission of the thermos-elastic coupled waves across a slab of finite thickness that is sandwiched between two semi-infinite homogeneous isotropic couple stress elastic solids are studied. Based on the modified couple-stress theory and the Green-Lindsay theory, the governing equations of the thermoeleastic wave propagation are derived. Different from the classic elastic solid, the interface conditions involve the micro-rotation and the surface couple. The nontraditional interface conditions between the slab and two half-spaces are used to obtain the linear algebraic equations set from which the amplitude ratios of reflection and transmission waves can be determined. Then, the energy fluxes carried by reflection and transmission waves are calculated numerically and the normal energy flux conservation is used to validate the numerical results. At last, the influences of two thermal relaxation times are discussed based on the numerical results. It is found that the thermos-elastic coupling makes the longitudinal wave and the thermal wave not only dispersive but also attenuated, and the thermal wave effect mainly affects the dilatational waves.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121679233","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019316
Ding Tong, Hongyan Tian, Yanli Zhang, Xin Li
Being as simple and lightweight structure in controlling low frequency noise, membrane-type acoustic metamaterial has been paid more attention. In this paper, theoretical model and analytical approach are presented to study the low frequency transmission loss performances of coupled-membrane type acoustic metamaterial(CMAM). The influences of the symmetric and asymmetric structures on the noise attenuation characteristics are discussed. The results demonstrate that asymmetric structure of CMAM is an ideal sound insulation material. By choosing proper material properties, multi-frequency and broad band sound insulation can be get in low frequency range (<1000Hz).
{"title":"Theoretical Investigation of Sound Insulation of Asymmetric Coupled-Membrane Acoustic Metamaterials","authors":"Ding Tong, Hongyan Tian, Yanli Zhang, Xin Li","doi":"10.1109/SPAWDA48812.2019.9019316","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019316","url":null,"abstract":"Being as simple and lightweight structure in controlling low frequency noise, membrane-type acoustic metamaterial has been paid more attention. In this paper, theoretical model and analytical approach are presented to study the low frequency transmission loss performances of coupled-membrane type acoustic metamaterial(CMAM). The influences of the symmetric and asymmetric structures on the noise attenuation characteristics are discussed. The results demonstrate that asymmetric structure of CMAM is an ideal sound insulation material. By choosing proper material properties, multi-frequency and broad band sound insulation can be get in low frequency range (<1000Hz).","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125122935","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019286
Yun-qiu Song, Xin-zhu Li, Zai-lin Yang, Guan-xi-xi Jiang, Yong Yang
This paper presents a theoretical approach to study the surface motion of a steepened hill impacted by incident SH waves. A rigorous solution has been derived by applying an accurate region-matching technique. According to the continuity condition at the auxiliary boundary, surface displacements are expressed in series of infinite algebraic equations, and the unknown coefficients of the series can be determined by Fourier series expansion technique in complex domain. Numerical results demonstrate the analytical results depend on some key parameters.
{"title":"Influence of a Steepened Hill on the Surface Displacement Amplitudes","authors":"Yun-qiu Song, Xin-zhu Li, Zai-lin Yang, Guan-xi-xi Jiang, Yong Yang","doi":"10.1109/SPAWDA48812.2019.9019286","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019286","url":null,"abstract":"This paper presents a theoretical approach to study the surface motion of a steepened hill impacted by incident SH waves. A rigorous solution has been derived by applying an accurate region-matching technique. According to the continuity condition at the auxiliary boundary, surface displacements are expressed in series of infinite algebraic equations, and the unknown coefficients of the series can be determined by Fourier series expansion technique in complex domain. Numerical results demonstrate the analytical results depend on some key parameters.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125200425","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019304
Fengzhong Li, Ying Luo, Bing Zhang
Ultrasonic phased array Total Focus Method (TFM) is used to process the signal with the data obtained by the Full Matrix Capture(FMC) mode, which has the advantages of high imaging accuracy and high signal-to-noise ratio(SNR). However, the frequency dispersion of the Lamb wave largelyaffected the imaging accuracy of the TFM. Therefore, the wavelet analysis time domain filtering in multi-band method was proposed to decompose an ultrasonic wide frequency band signal into several narrow band ones for suppressing dispersion effect, furthermore, the damage signal is extracted without reference signal and thus the damage is imaged in frequency domain, which improves the imaging accuracy. In this paper also analyzes the whole process of ultrasonic excitation, the interaction between the incident wavefield and damage as well as the sensor receiving signal, and establishes a quantitative imaging method of inverse scattering model with the reflectivity of the damaged surface as the index,further improve the imaging accuracy. Moreover, a numerical model and an experimental platform for prefabricated artificial damage of metal aluminum plate were established to compare the imaging effects of TFM in frequency domain and TFM with inverse scattering model in frequency domain. The results show that new algorithm is more accurate in locating damage and has stronger characterization ability.
{"title":"Research on Ultrasonic Damage Imaging Based on Total Focus Method","authors":"Fengzhong Li, Ying Luo, Bing Zhang","doi":"10.1109/SPAWDA48812.2019.9019304","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019304","url":null,"abstract":"Ultrasonic phased array Total Focus Method (TFM) is used to process the signal with the data obtained by the Full Matrix Capture(FMC) mode, which has the advantages of high imaging accuracy and high signal-to-noise ratio(SNR). However, the frequency dispersion of the Lamb wave largelyaffected the imaging accuracy of the TFM. Therefore, the wavelet analysis time domain filtering in multi-band method was proposed to decompose an ultrasonic wide frequency band signal into several narrow band ones for suppressing dispersion effect, furthermore, the damage signal is extracted without reference signal and thus the damage is imaged in frequency domain, which improves the imaging accuracy. In this paper also analyzes the whole process of ultrasonic excitation, the interaction between the incident wavefield and damage as well as the sensor receiving signal, and establishes a quantitative imaging method of inverse scattering model with the reflectivity of the damaged surface as the index,further improve the imaging accuracy. Moreover, a numerical model and an experimental platform for prefabricated artificial damage of metal aluminum plate were established to compare the imaging effects of TFM in frequency domain and TFM with inverse scattering model in frequency domain. The results show that new algorithm is more accurate in locating damage and has stronger characterization ability.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127211641","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019310
Guo-liang Yan, Xin-ran Xu, Zhen-yu Zheng, Wei Gao
The working environment of platform has put forward many requirements on the performance of hydrophone, and the sound pressure sensitivity and acceleration sensitivity are the most important, especially the acceleration sensitivity, which determines whether the hydrophone can effectively resist the vibration noise interference caused by platform vibration and eddy current. Reducing the acceleration sensitivity can improve the signal to noise ratio of hydrophone and reduce the minimum detectable signal. In this paper, the acceleration sensitivity mechanism of hydrophone is analyzed theoretically, and four methods to reduce the acceleration sensitivity of hydrophone are put forward. The four cases are analyzed by COMSOL finite element software.
{"title":"Acceleration Sensitivity Analysis of Hydrophone","authors":"Guo-liang Yan, Xin-ran Xu, Zhen-yu Zheng, Wei Gao","doi":"10.1109/SPAWDA48812.2019.9019310","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019310","url":null,"abstract":"The working environment of platform has put forward many requirements on the performance of hydrophone, and the sound pressure sensitivity and acceleration sensitivity are the most important, especially the acceleration sensitivity, which determines whether the hydrophone can effectively resist the vibration noise interference caused by platform vibration and eddy current. Reducing the acceleration sensitivity can improve the signal to noise ratio of hydrophone and reduce the minimum detectable signal. In this paper, the acceleration sensitivity mechanism of hydrophone is analyzed theoretically, and four methods to reduce the acceleration sensitivity of hydrophone are put forward. The four cases are analyzed by COMSOL finite element software.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129183488","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019278
Peng Zhao, Lili Yuan, Zhuolin Ye, B. Wang
In this paper, cement-based piezoelectric composite material is introduced into the periodic structure. A type of one-dimensional phononic crystal structure was proposed to overcome the difficulty of opening the low-frequency band gap. By the finite element method, the band gap structure was calculated. The influencing factors of the band gap were analyzed. The results show that the lower the density of hard clay, the higher the cut-off frequency of the band gap, while the higher the density of cement-based piezoelectric composite material, the lower the starting frequency of the band gap. The width of band gap also closely related to the lattice constant of the structure and the filling rate of material.
{"title":"Study on Vibration Isolation Performance of Intelligent Periodic Structure for Urban Viaduct","authors":"Peng Zhao, Lili Yuan, Zhuolin Ye, B. Wang","doi":"10.1109/SPAWDA48812.2019.9019278","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019278","url":null,"abstract":"In this paper, cement-based piezoelectric composite material is introduced into the periodic structure. A type of one-dimensional phononic crystal structure was proposed to overcome the difficulty of opening the low-frequency band gap. By the finite element method, the band gap structure was calculated. The influencing factors of the band gap were analyzed. The results show that the lower the density of hard clay, the higher the cut-off frequency of the band gap, while the higher the density of cement-based piezoelectric composite material, the lower the starting frequency of the band gap. The width of band gap also closely related to the lattice constant of the structure and the filling rate of material.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123456515","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 : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019242
Ji-wu Liu
Over the past several years,Hangzhou Applied Acoustics Research Institute (HAARI) hasdeveloped the ring transducer,including the air-backed ring transducer(ABRT) and free-flooded ring transducer(FFRT). Previous papers[1][2] described a kind of monostatic ABRT with radially poled ceramic and a broadband monostatic segmented FFRT with tangentially poled ceramic.In order to meet the requirements of small-sizedness,high-power,and high-effciency requirements,HAARI conducted in-depth research on bender disk transducers(BDT).The BDT described in this paper was potted in polyurethane,with a mass of 4.3kg in air.Tt has a maxium diameter of 190 mm.Both projector and hydrophone operation are available.The measured maximum transmitting voltage response(TVR) is 139.1dB//μPa @1m/V,@1.43kHz and the quality factor (Q) is 6.5. The maximum sound pressure level(SPL) is greater than 204.1dB. But in practice the output power of the power-amplifier is small,so the measured SPL is 201.8 dB,and for this measurement was tested at a water depth of 31 m. The acoustic output efficiency at resonance is 93.3% if we assumed the directivity index(DI) is 0.The maximum of the Receiving Voltage Response (RVS) in free field is -156.9dB//V/μPa@1.53kHz.The frequency band with receiving response decreasing 3dB is from 1.4kHz to 1.6kHz.The transducer is robust enough to withstand hydrostatic pressure at 4.5 MPa.
{"title":"A High-Power and High-Efficiency Bender Transducer","authors":"Ji-wu Liu","doi":"10.1109/SPAWDA48812.2019.9019242","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019242","url":null,"abstract":"Over the past several years,Hangzhou Applied Acoustics Research Institute (HAARI) hasdeveloped the ring transducer,including the air-backed ring transducer(ABRT) and free-flooded ring transducer(FFRT). Previous papers[1][2] described a kind of monostatic ABRT with radially poled ceramic and a broadband monostatic segmented FFRT with tangentially poled ceramic.In order to meet the requirements of small-sizedness,high-power,and high-effciency requirements,HAARI conducted in-depth research on bender disk transducers(BDT).The BDT described in this paper was potted in polyurethane,with a mass of 4.3kg in air.Tt has a maxium diameter of 190 mm.Both projector and hydrophone operation are available.The measured maximum transmitting voltage response(TVR) is 139.1dB//μPa @1m/V,@1.43kHz and the quality factor (Q) is 6.5. The maximum sound pressure level(SPL) is greater than 204.1dB. But in practice the output power of the power-amplifier is small,so the measured SPL is 201.8 dB,and for this measurement was tested at a water depth of 31 m. The acoustic output efficiency at resonance is 93.3% if we assumed the directivity index(DI) is 0.The maximum of the Receiving Voltage Response (RVS) in free field is -156.9dB//V/μPa@1.53kHz.The frequency band with receiving response decreasing 3dB is from 1.4kHz to 1.6kHz.The transducer is robust enough to withstand hydrostatic pressure at 4.5 MPa.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115165486","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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