{"title":"Correction of RAC phase response by Langmuir-Blodgett films","authors":"F. Huang","doi":"10.1109/ULTSYM.1988.49362","DOIUrl":null,"url":null,"abstract":"The correction of the phase versus frequency characteristic of SAW (surface acoustic wave) RAC (reflecting array compressor) and ILRAC (in-line RAC) pulse compressors using Langmuir-Blodgett films (LBFs) is reported. Without recourse to photolithography, an accurate, stepped thickness profile is easily deposited, correcting a position-dependent velocity error. The equations giving the required LBF profile are presented, and the limitation of LBF thickness to a positive, integer number of molecular layers is allowed for. Experimental results are presented of a device in which simulated compressed pulse sidelobes are reduced by 19 dB.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1988 Ultrasonics Symposium Proceedings.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1988.49362","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The correction of the phase versus frequency characteristic of SAW (surface acoustic wave) RAC (reflecting array compressor) and ILRAC (in-line RAC) pulse compressors using Langmuir-Blodgett films (LBFs) is reported. Without recourse to photolithography, an accurate, stepped thickness profile is easily deposited, correcting a position-dependent velocity error. The equations giving the required LBF profile are presented, and the limitation of LBF thickness to a positive, integer number of molecular layers is allowed for. Experimental results are presented of a device in which simulated compressed pulse sidelobes are reduced by 19 dB.<>
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