压电振动传感器用差分电荷放大器的校准方法研究

压电振动传感器用差分电荷放大器的校准方法研究AbstractPiezoelectric vibration sensors are widely used in various fields to d

压电振动传感器用差分电荷放大器的校准方法研究 Abstract Piezoelectricvibrationsensorsarewidelyusedinvarious fieldstodetectandmeasuremechanicalvibrations.Asacritical componentinvibrationsensingsystems,adifferentialcharge amplifieriscommonlyemployedtoamplifythesensingsignal. However,thecalibrationofthedifferentialchargeamplifieris essentialforaccuratemeasurement.Inthispaper,wepresenta methodtocalibrateadifferentialchargeamplifierforpiezoelectric vibrationsensors.Thismethodisbasedonmeasuringthetransfer functionofthesensor/amplifiersystemandcorrectingthegain andphaseerrors.Experimentalresultsdemonstratethe effectivenessoftheproposedcalibrationmethodinimprovingthe accuracyofvibrationmeasurement. Introduction Piezoelectricvibrationsensorsareusedinvarious applications,suchasstructuralhealthmonitoring,vibration analysis,andconditionmonitoringofrotatingmachinery.The piezoelectricsensorconsistsofapiezoelectriccrystalthat generatesavoltageinresponsetomechanicalvibrations.To measurethevoltageoutputofthepiezoelectricsensoraccurately, adifferentialchargeamplifierisoftenusedtoamplifythesensor signal.Thedifferentialchargeamplifierconvertsthecharge generatedbythepiezoelectricsensorintoavoltageoutputthatis proportionaltotheinputsignal. Theaccuracyofthedifferentialchargeamplifierplaysa criticalroleinmeasuringthevibrationsignal.Therefore,itis essentialtocalibratethedifferentialchargeamplifiertoensurethe accuracyofthemeasurement.Inthispaper,wepresenta calibrationmethodfordifferentialchargeamplifiersthatuse piezoelectricsensors.Theproposedcalibrationmethodcan correctthegainandphaseerrorsandimprovetheaccuracyofthe sensor/amplifiersystem. CalibrationMethod Theproposedcalibrationmethodisbasedonmeasuringthe transferfunctionofthesensor/amplifiersystemandcorrectingthe gainandphaseerrors.Thecalibrationprocessinvolvesthe