精密超声波密度计研究.pdf

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1、机床与液压Dec．2014HydromechatronicsEngineeringVoJ_42No．24DOI：10．3969／j．issn．1001-3881．2014．24．008StudyontheprecisionultrasonicdensimeterXing—hongZHANG。，LeiQIU"，XinCHEN，TaoHE，Shu—xiangLIUlChongqingKeyLaboratoryTime—gratingSensingandAdvancedTestingTechnology．Ch

2、ongqingUniversityofTechnology，Chongqing400054，China。VehicleEngineeringDepartment，SichuanEngineeringTechnicalCollege，Deyang618000，ChinaAbstract：Tose~lesomeproblemsonthetraditionaldensitymeasurementinstrumentagainstac-tualapplication．ahighprecisionultrason

3、icdensimeterisdesignedonthebasisoftheultrasonicwavepropagationcharacteristics．Thehighresolutionandfastsignalcollectioncircuitandthedig—jtaJsubdivisionalgorithmswhichareusedtomakethemeasurementoftheultrasonicwavepropa—gationtimereachnanosecondandensurethe

4、measurementresolutionoftheultrasonicdensime．terbetterthan0．00001x10。kg／m．Thedistributedmeasuringprobesareinstalledoppositelyattheektexineofthevesse1whichiscontainedthemeasuredmedium．Thedistributedstructurede-signishelpfultoimprovetheaccuracyofthemeasurem

5、entresult．Keywords：Ultrasonicwave，Densitymeasurements，Echosignal，Digitalsubdivisioncyanddifficultmaintenance；theraydensimetercan1．Introductionrealizenon—contactmeasurement，butalsohasthedisadvantageaboutradiationhazards[2]．Densityisoneofphysicalquantities

6、ofmaterialInrecentyears，withtherapiddevelopmentofproperties．Thedensitymeasurementembodiesthethehightechnology，anewthoughtofthedensitymeasurementlevelofourcountryandiswidelyusedmeasurementisproposedbasedontheultrasonicinthefieldoftechnology，agriculture，in

7、dustryandtechnology[3]．Theultrasonictechnologycanrealizeourdailylife[1]．thedensitymeasurementwiththenon—contactandSeveralkindsofdensimetersareusedinthein—continuity[4]．Theultrasonicdensitysensorshavedustry，suchasvibrationliquiddensimeter，capaci—promising

8、applicationprospects，whichcancompletetiveliquiddensimeterandraydensitysensor，butinthedynamicmeasurementofdensitywithhighpreci—thepracticalapplicationthesetraditionaldensimeterssion『5]．allhavesomedeficiencies．Forexamples，th