電磁流量計(jì)低頻正弦波勵磁方法的研究.pdf

1、浙江大學(xué)碩士學(xué)位論文電磁流量計(jì)低頻正弦波勵磁方法的研究姓名：王儉申請學(xué)位級別：碩士專業(yè)：檢測技術(shù)與自動化裝置指導(dǎo)教師：張宏建周洪亮20060301浙江大學(xué)碩1學(xué)化論史AbstractElectromagneticflowmeterwhichisbasedonFaraday’sinductionlawisavelocityrtypeflowmeterCurrentlyelectromagneticflowmetersgenerallyad

2、optlowfrequencysquare—waveformexcitingmodebutsinewaveformexcitingmodeisalsoinconsiderationsometimesHowevehintensivedifferentialinterfereneewhichisverydifliculttobeeliminatediSproducedwhentheauthorado’ptssine—waveformexci

3、tingmodeHOWtoeliminatetheintensivedifferentialinterferenceinthismodeiSabigproblemCurrentantijamtechniqueinsinewaveformexcitingmodeiScomplexandoffallibilitywhichiSthereasonforunpopularityofthisexcitingmode，F(xiàn)ortheadvanceme

4、ntofantijamtechniqueinlowfrequencysine—waveforlnexcitingmode，anewsignalprocessmethodisusedinwhichtheexcitingcurrentsignalintheloopiSmultipliedbythesignalfromthetwoelectrodesThentheproductwhoseDCcoml90nentiSinproportionto

5、thevelocityofflowCanbeobtainedInthiswaytlleintensivedifierentialinterferencewillnotinfluencetheresultSozero—pointstabilityandmeasurementaccuracyCanbeimprovedBasedontheconceptionsmentionedabove，electromagneticflowmeterpro

6、totypebasedonlowfrequencysinewaveformexcitingmodewasdevelopedInthethesisfollowedWOrksarementioned：(1)Thebasictheorydevelopmentandstatusofelectromagneticflowmeterwereintroducedindetailandanewsignalprocessmethodisproposed(

7、2)Theelectromagneticflowmeterprototype，basedonMSP430MCU，wasdevelopedanditadoptslow—frequencysinewaveformexcitingmode(3)Basedontheflowmeterprototype，manyexperimentsweredoneindifferentexcitingfrequencyandsamplingmodeExperi