{"title":"Influence Analysis of Sensor's Nonlinearity on Output of Lock-in Amplifier","authors":"Zhihua Feng, Rilong Liu, Dengfeng Yang, F. Kong","doi":"10.1109/IMTC.2005.1604469","DOIUrl":null,"url":null,"abstract":"Generally the lock-in amplifier (LIA) can be used to detect very weak signal. This is based on the fact that any signal with a different frequency from that of the LIA's reference signal will result in zero output. However, if the signal is measured by a sensor with some nonlinearity, the LIA indeed yields some mixed output that comes from the correlation between the measured signal and reference signal. This paper presents a theoretical analysis on the output of LIA. Furthermore, based on analysis results, a curve fitting method of measuring the sensor's dynamic and tiny nonlinearity is provided. Experimental results verify that it is a useful measurement method when the accuracy is focused on","PeriodicalId":244878,"journal":{"name":"2005 IEEE Instrumentationand Measurement Technology Conference Proceedings","volume":"61 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2005 IEEE Instrumentationand Measurement Technology Conference Proceedings","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IMTC.2005.1604469","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Generally the lock-in amplifier (LIA) can be used to detect very weak signal. This is based on the fact that any signal with a different frequency from that of the LIA's reference signal will result in zero output. However, if the signal is measured by a sensor with some nonlinearity, the LIA indeed yields some mixed output that comes from the correlation between the measured signal and reference signal. This paper presents a theoretical analysis on the output of LIA. Furthermore, based on analysis results, a curve fitting method of measuring the sensor's dynamic and tiny nonlinearity is provided. Experimental results verify that it is a useful measurement method when the accuracy is focused on
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