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6th International Symposium on Electrets,(ISE 6) Proceedings.最新文献

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Space charge investigation in beta -PVDF by thermally stimulated measurements 用热激测量研究β -PVDF中的空间电荷
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38525
R. Faria, A. Jorge
{"title":"Space charge investigation in beta -PVDF by thermally stimulated measurements","authors":"R. Faria, A. Jorge","doi":"10.1109/ISE.1988.38525","DOIUrl":"https://doi.org/10.1109/ISE.1988.38525","url":null,"abstract":"Thermally stimulated current measurements in beta -PVDF (polyvinylidene fluoride) films were carried out under an applied electric field. A strong peak was detected around 80 degrees C for E=100 kV/cm, and approximately at 100 degrees C for E=10 kV/cm. It was interpreted to be due to stored space charge thermally released, since the peak always disappeared in a second measurement. However, it was always present when consecutive measurements were carried out accompanied by an inversion of the applied field. It is suggested that the released charge was not swept away but remained trapped at surface traps. The authors obtained values of 1.0 and 1.4 eV, respectively, for the activation energies of the bulk and surface traps.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126014890","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
Detection of stress field shear components by a piezoelectric polymer tactile sensor 基于压电聚合物触觉传感器的应力场剪切分量检测
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38555
D. De Rossi, A. Nannini, C. Domenici, R. Francesconi
{"title":"Detection of stress field shear components by a piezoelectric polymer tactile sensor","authors":"D. De Rossi, A. Nannini, C. Domenici, R. Francesconi","doi":"10.1109/ISE.1988.38555","DOIUrl":"https://doi.org/10.1109/ISE.1988.38555","url":null,"abstract":"A partial implementation of a multielement tactile sensor based on piezoelectric polymer technology is presented. The sensor's ability to resolve the shear stress component acting on it under axisymmetric, normal loading at its boundary is demonstrated. This feature is thought to be instrumental in revealing slippage detection during object grasping and manipulation.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132704063","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
Market situation of Piezo-, pyro- and dielectric films-latest developments 压电膜、热膜和介电膜的市场形势-最新发展
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38552
R. A. Betz
{"title":"Market situation of Piezo-, pyro- and dielectric films-latest developments","authors":"R. A. Betz","doi":"10.1109/ISE.1988.38552","DOIUrl":"https://doi.org/10.1109/ISE.1988.38552","url":null,"abstract":"Applications of piezoelectric films for large surface sensors are discussed. These include sensors for the detection of SIDS (sudden infant death syndrome), road detectors, cable wrapping, etc. The versatility of PVDF (polyvinylidene fluoride) films has also been used in the manufacture of very small and sensitive detectors or detector arrays in such diversified fields as ultrasound sensors for nondestructive testing or medical imaging, infrared array sensors for movement and heat sensing, and force of acceleration detectors. Bimorphs have gained increasing interest recently since the publication of a description of a flat display panel (a giant television screen) using mono-oriented piezoelectric films. Dielectric PVDF films are now also used in Europe; several with qualities that can be used in the capacitor industry are available. These properties and the industrial targets are described.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133157991","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: 2
Effect of electrode coating on leakage current and surface flashover strength in polymers 电极涂层对聚合物泄漏电流和表面闪络强度的影响
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38577
F. Youssef, T.D. Eish
{"title":"Effect of electrode coating on leakage current and surface flashover strength in polymers","authors":"F. Youssef, T.D. Eish","doi":"10.1109/ISE.1988.38577","DOIUrl":"https://doi.org/10.1109/ISE.1988.38577","url":null,"abstract":"The influence of electrode coating on the leakage current of three polymer insulating materials, namely, polystyrene, (PS), polyvinyl chloride (PVC), and polymethylmethacrylate (PMMA), is investigated. The insulating materials have been subjected to alternating voltage (50 Hz) under inhomogeneous field conditions (rod-plate electrode system). Experimental investigations of the effect of specimen thickness on leakage current and flashover voltage have been carried out under bare electrode conditions as well as under coated electrode conditions. The results illustrating the effect of electrode coating on leakage current and surface flashover voltage are presented and discussed.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133245233","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
Personnel radiation dosimetry using electret ionisation chambers 用驻极体电离室进行人员辐射剂量测定
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38574
K. Doughty, I. Fleming
{"title":"Personnel radiation dosimetry using electret ionisation chambers","authors":"K. Doughty, I. Fleming","doi":"10.1109/ISE.1988.38574","DOIUrl":"https://doi.org/10.1109/ISE.1988.38574","url":null,"abstract":"A personnel dosimetry system has been developed to satisfy the protection needs of nonregistered radiation workers in hospitals and nuclear installations. It consists of up to 200 special badges, each containing a charged electret film, and a microprocessor-controlled reader unit which calculates the cumulative radiation dose by measuring the surface potential of the electret noninvasively. A badge can read frequently without destroying the cumulative information on dose.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117164020","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: 2
Behavior of negatively corona charging Teflon-FEP at elevated temperature 铁氟龙- fep在高温下的负电行为
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38607
Lu Ting-ji, Yang Guo-Mao, Sun Xi-min
{"title":"Behavior of negatively corona charging Teflon-FEP at elevated temperature","authors":"Lu Ting-ji, Yang Guo-Mao, Sun Xi-min","doi":"10.1109/ISE.1988.38607","DOIUrl":"https://doi.org/10.1109/ISE.1988.38607","url":null,"abstract":"A study was made of the behavior of negative corona charging of Teflon FEP (fluorinated ethylene propylene) at elevated temperatures. Equivalent surface voltages, charge centroids, total charges per unit area, and TSC (thermally stimulated current) of samples were determined under different charging temperatures and charging times. From their relationships the authors found several interesting results. For example, under elevated temperatures there are limitations to the depth of charge centroids and maximum of total charge per unit area. The best charging temperature and charging time with respect to stability of negative corona charging of Teflon FEP were determined.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124420211","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
Modern electret applications-the first 20 years 现代驻极体的应用——前20年
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38550
J. West
{"title":"Modern electret applications-the first 20 years","authors":"J. West","doi":"10.1109/ISE.1988.38550","DOIUrl":"https://doi.org/10.1109/ISE.1988.38550","url":null,"abstract":"A review is presented of commercialization of the foil electret microphone. The success of these microphones is attributed to their excellent acoustic properties, low cost, mechanical simplicity, and above all the stability of the charge in Teflon even under extreme environmental conditions. The author discusses the No-Voltage Velotron, the application of thick wax electret microphones in Japanese field equipment during World War II, and the development and application of thin piezo- or pyroelectric polymer electrets. Since the commercial success of electroacoustic transducers in the audio frequency range, microphones using thin polymer electrets have been proposed that extend the frequency range from 10/sup -3/ Hz to more than 2*10/sup 8/ Hz for use in solids, liquids, and gases. The physical size of microphones based on both of the above principles have been reduced to micrometer dimensions.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"1150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128291493","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: 2
The trapping of electrons in polystyrene 聚苯乙烯中电子的俘获
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38522
P. Watson
{"title":"The trapping of electrons in polystyrene","authors":"P. Watson","doi":"10.1109/ISE.1988.38522","DOIUrl":"https://doi.org/10.1109/ISE.1988.38522","url":null,"abstract":"A thin polystyrene film is charged with a short pulse of low-energy electrons (2 keV). Most of these electrons are deeply trapped in the polymer; the remaining electrons are excited from shallow traps into conduction levels and are swept out of the polymer. At short times, when most of these shallow-trapped electrons are excited into the conduction levels, the current approaches the space-charge limit: hence a value for electron mobility is obtained. At long times (from about five seconds to thousands of seconds) the conduction process is dominated by the rate of excitation from deeper-lying trapping levels; the excitation of electrons from these traps can be analyzed in terms of a time-dependent demarcation energy that is related to elapsed time. The time dependence of current is thus related to the distribution of electron traps in the polymer.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060592","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: 30
Electro-optical behaviour of ferroelectric liquid crystal (FLC) mixtures 铁电液晶(FLC)混合物的电光行为
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38575
H. Dubal, C. Escher, D. Ohlendorf
{"title":"Electro-optical behaviour of ferroelectric liquid crystal (FLC) mixtures","authors":"H. Dubal, C. Escher, D. Ohlendorf","doi":"10.1109/ISE.1988.38575","DOIUrl":"https://doi.org/10.1109/ISE.1988.38575","url":null,"abstract":"In combination with the fabrication technique and the driving electronics, material parameters determine the static and dynamic director configuration and, therefore, the electrooptical behavior of the surface-stabilized ferroelectric liquid crystal (FLC) display (SSFLC), a promising technique for applications which require video frame rate and high spatial resolution, such as TV and computer monitors. The authors describe another important parameter, which is the type of texture that is induced by the application of AC electric fields. It is shown that the smectic layer structure of the display and thus its texture are irreversibly changed by exceeding a critical AC field amplitude that depends on the frequency, the temperature, and some material properties. In the altered textures the same FLC material exhibits strikingly different electrooptical properties.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126962094","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: 2
Charging characteristics of a nonwoven sheet air filter 无纺布空气过滤器的充注特性
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38614
T. Oda, J. Ochiai
{"title":"Charging characteristics of a nonwoven sheet air filter","authors":"T. Oda, J. Ochiai","doi":"10.1109/ISE.1988.38614","DOIUrl":"https://doi.org/10.1109/ISE.1988.38614","url":null,"abstract":"Corona-charging characteristics of a nonwoven polypropylene sheet of 140- mu m thickness are studied with respect to the charging conditions. When the grid voltage, V/sub g/, which controls the surface potential of the film, is -3 kV, the surface potential profile of the charged sheet is nonuniform. The profile is very uniform when V/sub g/ is only 1 -kV. The average surface potential of the charge sheet is roughly -500 V in both cases if charging time is long enough (e.g. more than 30 min). The experimental results for charge decay with time, resistivity in normal or ion-rich conditions, and TSDC curves are also reported.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130541076","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: 38
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