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Nondestructive Inspection of Niobium to Improve Superconductivity 改善铌超导性的无损检测
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198569
M. Oravecz, L. W. Kessler, H. Padamsee
{"title":"Nondestructive Inspection of Niobium to Improve Superconductivity","authors":"M. Oravecz, L. W. Kessler, H. Padamsee","doi":"10.1109/ULTSYM.1985.198569","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198569","url":null,"abstract":"This paper demonstrates that the information needed to select the highest quality niobium is obtainable nondestructively . Performance improvements of particle accelerators using RF superconductivit y requires rapid nondestructive inspection of commercially pure niobium sheets in bulk for assurance of high purity, small grain size, freedom from critical defects and near 100% recrystallizatio n. A total of 1.5 square meters of 3.0 and 1.5 mm thick niobium sheet vas scanned uith a Scanning Laser Acoustic Microscope (SLAM) using acoustic resolution of up to 25-50 microns. We found -- acoustic attenuation in both niobium plates and velds depends on interstitial gas content; spatial variation in acoustic transmission depends on grain size; ultrasonic evidence of inadequate recrystallizatio n; i nternal delaminations; and that internal localized i nclusions and voids are detectable. A principle SLAM advantage is its combination o f high scan density and high scan rate (130 lines/mm a nd o ne square meter in 30 minutes at 60 MHz) making practical large quantity inspection (e.g. 100 tons proposed )","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131118620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Ultrasonic Detection of In-Plane Properties of Composite Laminates 复合材料层合板面内性能的超声检测
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198661
L. Pearson, W. Murri, D. Gardiner
{"title":"Ultrasonic Detection of In-Plane Properties of Composite Laminates","authors":"L. Pearson, W. Murri, D. Gardiner","doi":"10.1109/ULTSYM.1985.198661","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198661","url":null,"abstract":"In aerospace applications, composite materials are generally used as load bearing structures. It is the role of nondestructive evaluation (NDE) to provide input concerning deviations in material properties (such as flaws) to structural analysis models so that structural performance predictions can be made. Since composite analytical models require material mechanical properties as input. NDE can best serve analysis by providing quantitative measurements o t these properties. Because most composite structures are designed to carry in-plane loads, NDE should ideally provide information about in-plane mechanical properties such as strengths and stiffnesses. This paper discusses the importance of quantitative NDE and also describes work that is directed at the development of ultrasonic BDE techniques which are sensitive to in-plane elastic properties of composite laminates.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133473226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Mechanistic Considerations of Acoustic Dewatering Techniques 声学脱水技术的机理研究
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198681
R. Beard, H. S. Muralidhara
{"title":"Mechanistic Considerations of Acoustic Dewatering Techniques","authors":"R. Beard, H. S. Muralidhara","doi":"10.1109/ULTSYM.1985.198681","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198681","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133471053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The Ultimate Concert Hall and Other Ultimate Truths 终极音乐厅和其他终极真理
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198465
J. Borish
{"title":"The Ultimate Concert Hall and Other Ultimate Truths","authors":"J. Borish","doi":"10.1109/ULTSYM.1985.198465","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198465","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132468275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Reflection of Bulk Acoustic Waves in Rotated Y-Cut Quartz 关于体声波在旋转y形切割石英中的反射
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198525
F. Josse, J. Vetelino, W. Soluch, J. Andle
{"title":"On the Reflection of Bulk Acoustic Waves in Rotated Y-Cut Quartz","authors":"F. Josse, J. Vetelino, W. Soluch, J. Andle","doi":"10.1109/ULTSYM.1985.198525","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198525","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114158592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
SAW Diffraction Analysis and Correction by Waveguide Approximation 波导近似声表面波衍射分析与校正
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198476
Y. Yamamoto, M. Morimoto
{"title":"SAW Diffraction Analysis and Correction by Waveguide Approximation","authors":"Y. Yamamoto, M. Morimoto","doi":"10.1109/ULTSYM.1985.198476","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198476","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114845136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Thermoacoustic Images Generated by a 2450 MHz Portable Source and Applicator 由2450 MHz便携式源和应用器产生的热声图像
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198643
R. L. Nasoni, Soo Chin Liew, P. Halverson, T. Bowen
{"title":"Thermoacoustic Images Generated by a 2450 MHz Portable Source and Applicator","authors":"R. L. Nasoni, Soo Chin Liew, P. Halverson, T. Bowen","doi":"10.1109/ULTSYM.1985.198643","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198643","url":null,"abstract":"Acoustic signals generated by deeply penetrating radiation in soft tissue offer the possibility of producing medical images unique in the sense that the imaging parameters differ from those in current use. The potential for such images is twofold: low level inducing fields such as rf or microwave could be used to generate diagnostic images, or the fields present in therapy could be used to generate information on energy deposition during tumor irradiation or offer thermometric assistance in hyperthermia. Earlier work presented in these symposia discussed the theory and presented confirming experimental results for various sources of radiation. These emissions were produced by low-level, pulsed microwave radiation. The present work represents a significant advance in two respects: resolution has been greatly improved with a highefficiency broadband transducer, and microwave radiation is coupled into an interrogated region of arbitrary size and shape using an applicator horn matched to water and fed from a 2450 MHz microwave source similar to that used in clinical hyperthermia.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116202633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A New Ultrasonic Imaging System 一种新型超声成像系统
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198665
G. Gunarathne, J. Szilard
{"title":"A New Ultrasonic Imaging System","authors":"G. Gunarathne, J. Szilard","doi":"10.1109/ULTSYM.1985.198665","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198665","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128564155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Ultrasonic Characterization of Highly Attenuative Fiber-Reinforced Composites 高衰减纤维增强复合材料的超声表征
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198659
N. Batra, H. Chaskelis, P. Delsanto
{"title":"Ultrasonic Characterization of Highly Attenuative Fiber-Reinforced Composites","authors":"N. Batra, H. Chaskelis, P. Delsanto","doi":"10.1109/ULTSYM.1985.198659","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198659","url":null,"abstract":"Different specimens of highly attenuative fiber-reinforced composites have been investigated ultrasonically. Conventional pulseecho techniques cannot be easily applied to characterize these materials. due to lack of multiple echoes. Using a transmission technique. we were able to map the relative attenuation in a reproducible fashion. In order to eliminate errors due to energy losses at the interfaces, we measured the attenuation with specimens in the shapes of wedges or steps. The mapping of attenuation provides a technique to predict non-destructively the periodicity (or lack of) of the weave, the heterogeneities of the fibers and, to a lesser degree, of the matrix, the misalignment of the fibers and other irregularities.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134402167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Properties of PVDF Polymer for Sonar 声纳用PVDF聚合物性能研究
IEEE 1985 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1985.198585
R. Tancrell, D. Wilson, D. Ricketts
{"title":"Properties of PVDF Polymer for Sonar","authors":"R. Tancrell, D. Wilson, D. Ricketts","doi":"10.1109/ULTSYM.1985.198585","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198585","url":null,"abstract":"Polyvinylidene fluoride (PVDF) polymer is evaluated for application in large sonar arrays. The piezoelectric coefficients and elastic constants of thick (550 urn) PVDF produced at Raytheon are measured, and the apparatus for making the measurements is described. It is shown, both theoretically and experimentally, that electrodes deposited on the surface can stiffen the polymer and significantly alter the observed properties. The free-f ield frequency response for an experimental hydrophone is shown over a broad frequency range, f ee of spurious resonances. Stability to relatively high temperature (90°C) and to high static pressure (6.9 MPa = 1000 ps 1 are shown from experimental data.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"351 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133969460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
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