简介：Basedontotalreflectionprinciple,acompactliquid-refractiveindexmeasuringequipmentwasdesignedandfabricated,inwhichadiodelaserwasusedaslightsourceandacharge-coupleddevice(CCD)asphotodetector.Theinfluenceonmeasurementaccuracyofthewavelengthshiftandintensityfluctuationofthediodelaserweresurmountedbyaneffectivefeedbackmethod.Itiscrucialwhetherthediodelasercouldbeusedinsuchasystem.

简介：Wereportamethodforsimultaneouslyanddirectlymeasuringallsix-degrees-of-freedom(six-DOF)motionerrorsofarotaryaxis.Suchamethodcombinestheprinciplesoflaserinterferometryandlasercollimationmeasurement.Onereferencerotaryaxisandtworetro-reflectorsareusedtoachievesimultaneoussensitivitytoallsixerrorsinafull-circlemeasuringrange.Asnoseparationmodelsarerequired,ourmethodiscapableofdynamicallymeasuringtheseerrorsinrealtimeandconvenientlydeterminingtheoriginoftheerrors.Anautomaticmeasuringdeviceisbuilt.Theeffectivenessofourmethodisexperimentallydemonstrated.

简介：Thenormalspectralemissivityofniobiumstripspecimenismeasuredusinganewpulse-heatingreflectometrictechnique.Thehemisphericalspectralreflectivityofthesurfaceofastriptangenttoanintegratingsphereisdeterminedbyahigh-speedlock-intechnique.Atthesametime,theradiancetem-peratureofthestripismeasuredbythemulti-wavelengthhigh-speedpyrometerfromapproximately1000Ktothemeltingpoint.Detailsofthemeasurementmethodandoftherelatedcalibrationtechniquesarereported.Resultsofthenormalspectralemissivityofniobiumat633,753,827,and905nmfromroomtemperaturetoitsmeltingpointarepresented.Theaccuracyofspectralemissivitiesisestimatedbetterthan5%.