简介：Aspatialdistributionofdiffusereflectanceproducedbyobliquelyincidentlightisnotcenteredaboutthepointoflightentry.Thevalueofshiftinthecenterofdiffusereflectanceisdirectlyrelatedtotheabsorptioncoefficientμ_aandtheeffectiveattenuationcoefficientμ_(eff).μ_aandthereducedscatteringcoefficientμ'_sofhumanskintissuesinvivoaremeasuredbyoblique-incidencereflectometrybasedonthetwo-sourcediffusetheorymodel.FortenChinesevolunteersaged15-63years,μ_aandμ'_sarenoninvasivelydeterminedtobe0.029-0.075and0.52-0.97mm~(-1),respectively.

简介：SpecimensofPbTesinglefilmaredepositedonGesubstratesbyvacuumthermalevaporation.Duringthetemperaturerangeof80–300K,thetransmittanceofaPbTefilmwithin2–15μmismeasuredevery20KbythePerkinElmerFouriertransforminfraredspectroscopycryogenictestingsystem.Then,therelationshipbetweentherefractiveindexandwavelengthwithin7–12μmatdifferenttemperaturesisreceivedbythefullspectruminversionmethodfitting.ItcanbeseenthattherelationshipconformstotheCauchyformula,whichcanbefitted.Then,therelationshipbetweentherefractiveindexofthePbTefilmandthetemperature/wavelengthcanbeexpressedasn(λ,T)=5.82840-0.00304T+4.61458×10~(-6)T~2+8.00280∕λ~2+0.21544∕λ~4,whichisobtainedbythefittingmethodbasedontheCauchyformula.Finally,thedesignedvalueobtainedbytheformulaandthemeasuredspectrumarecomparedtoverifytheaccuracyoftheformula.

简介：Becausepulserepetitionrateaffecteddirectlythemomentumcouplingcoefficientoftransverselyexcitedatmospheric(TEA)CO2laserpropulsion,adoublepulsetrigger,controllinghighvoltageswitchoflaserexcitationcircuit,wasdesigned.Thepulseintervalrangedbetween5and100ms.Themomentumcouplingcoefficientforair-breathingmodelaserpropulsionwasstudiedexperimentally.Itwasfoundthatthemomentumcouplingcoefficientdecreasedwiththepulserepetitionrateincreasing.