高精度自校正超聲波液位測(cè)量系統(tǒng)研究與實(shí)現(xiàn).pdf

1、華中科技大學(xué)碩士學(xué)位論文高精度自校正超聲波液位測(cè)量系統(tǒng)研究與實(shí)現(xiàn)姓名：黃臻申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：檢測(cè)技術(shù)與自動(dòng)化裝置指導(dǎo)教師：孔力20060508IIAbstractUltrasonicliquidlevelmeasurementisakindoftraditionalbuthavingpotentialsmethods.Itisapurposeofthethesistosolveseverallimitationssuchaslow

2、resolutionprecisiongreatnearlimitfbeingrestrictedtotherevisingvelocityofsoundfrequencythethesismeetwiththerequestsofhighprecisionlittlenearlimittotheliquidlevelmeasureinthedynamiccomplicatedenvironment.Basedontheresearch

3、ofacousticaltheiesultrasonicphysicaltheiesfirstthisthesisanalyzetheultrasonicfieldtodiscussthedisadvantagestrongpointofthemeasureofgaseousmediumliquidmediumsolidmediumchoosetheliquidmediummeasureastheadoptivemethodinthis

4、thesis.ThenitdiscusstheproblemofSignaltoNoisenearlimitinthemeasureofliquidleveladopthighfrequencyshtpulsesultrasonictransducertoimplementthehighpreciselessnearlimitmeasure.Whilethethesisgaintheupperlowerlimitofthediamete

5、rthelocationofreflectingbatftheacousticwaveguideviacomputingapproximatelysothatithaseffectivelyenhancedtheechointensityresolvedtheinfluencethatthetemperaturegradsofmediumhasonthemeasuringprecision.Thehardwarepartsconsist

6、ofpulsedrivercircuitrymagnifyfiltercircuitryhighspeeddataacquisitioncircuitryPC104.ThisthesisemphaticallyintroducedthedesignofappliedsoftwareincludinghumancomputerinteractioninterruptsproceduresofacquisitionarithmeticofK

7、almanfiltertominifytheeffectsthatnoisehasonthemeasuringprecisionbydiscussinginvestigatingthemeasuringerraidentifyingmethodffirstechointensity—thefronthalfbackfulllengthsearchingmethod—towipeoffnoiseintensity.Finallythist