{"title":"A Novel Digital Lock-in Amplifier with Dual Channels","authors":"Dongyue Wu, Chao Wang, Hongjun Sun, Huaxiang Wang","doi":"10.1109/CAR.2009.24","DOIUrl":null,"url":null,"abstract":"In order to sample two channels mixing frequency signals in high speed and process them synchronously in the system, a dual-channel, high-speed digital lock-in amplifier (LIA) that uses orthogonal digital demodulation is proposed. The instrument, based on a digital signal processor (DSP) and its associated hardware, is implemented. The system adopts a method of high speed bi-directional parallel communication between DSP and parallel interface of PC by EPP (Enhanced Parallel Port) protocol. The EPP achieves an easy installation for industrial applications. The experimental tests showed that the system is feasible.","PeriodicalId":320307,"journal":{"name":"2009 International Asia Conference on Informatics in Control, Automation and Robotics","volume":"204 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 International Asia Conference on Informatics in Control, Automation and Robotics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CAR.2009.24","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
In order to sample two channels mixing frequency signals in high speed and process them synchronously in the system, a dual-channel, high-speed digital lock-in amplifier (LIA) that uses orthogonal digital demodulation is proposed. The instrument, based on a digital signal processor (DSP) and its associated hardware, is implemented. The system adopts a method of high speed bi-directional parallel communication between DSP and parallel interface of PC by EPP (Enhanced Parallel Port) protocol. The EPP achieves an easy installation for industrial applications. The experimental tests showed that the system is feasible.
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