Tsis ntev los no, pab pawg tshawb fawb coj los ntawm xibfwb Zhang Zhirong ntawm Anhui Institute of Optics thiab Precision Mechanics, Hefei Institutes of Physical Science, Suav Academy of Sciences, tau ua tiav tseem ceeb hauv kev kawm txog kev tsim kho cov thev naus laus zis rau dav -spectrum absorption gases. Cov kev tshawb pom, lub npe hu ua "Baseline Reconstruction for Broad-Spectrum Absorption Characteristics of Alkane Mixtures Based on Laser Absorption Spectroscopy," tau luam tawm nyob rau hauv thoob ntiaj teb kev kawm ntawv journal Analytical Chemistry.
Direct absorption spectroscopy yog txoj kev siv ntau tshaj plaws ntawm kev ntsuas roj ntau hauv laser absorption spectroscopy. Txawm li cas los xij, nws qhov kev ntsuas qhov tseeb hnyav heev nyob ntawm qhov tau txais qhov tseeb ntawm qhov teeb meem teeb pom kev siv lub hauv paus- lub teeb liab siv lub teeb thaum tsis muaj roj nqus. For gases with broad-band absorption characteristics, such as alkanes (eg, propane, butane), absorption lines are densely packed and continuous, often lacking distinct absorption-free regions. Cov yam ntxwv no ua rau cov txheej txheem kho cov txheej txheem ib txwm muaj-xws li kev nqus- ib puag ncig kev kwv yees pub dawb txoj hauv kev los yog kev sib txuam ntau yam - tsis muaj txiaj ntsig lossis tsis muaj kev ntseeg siab tiag tiag -lub ntiaj teb kev lag luam dynamic soj ntsuam scenarios, tsim kom muaj lub hwj chim tseem ceeb rau siab - kev siv thev naus laus zis no.
Hais txog kev xav tau kev nyab xeeb sai rau kev ua haujlwm siab rau siab -precision, tiag- lub sij hawm saib xyuas ntawm alkane marker gases-tshwj xeeb hauv cov ntawv thov xws li roj thiab roj tank xau kom pom- pab pawg tshawb fawb tau tawm tswv yim tshiab dual - wavelength baseline reconstruction lub tswv yim hauv lub cev. Lub tswv yim tseem ceeb leverages kev sib raug zoo ntawm lub cev nyob rau hauv txoj kev kho qhov muag es tsis yog cia siab rau txoj kev xav algorithmic los yog kev cob qhia cov ntaub ntawv dav. Pab pawg tau tshawb pom tias nyob rau hauv ntau yam -xov tooj ntawm lub cev nqus, qhov hloov pauv ntawm lub teeb siv los ntawm cov yam ntxwv xws li kub hloov pauv thiab cov khoom siv kho qhov muag jitters pom muaj kev sib raug zoo nyob rau ntau lub wavelengths.
Leveraging no lub cev mechanism, pab neeg no ntse tsim ib tug robust linear qauv txuas lub hom phiaj wavelength (1686 nm, feem ntau rau kev soj ntsuam propane thiab butane) nrog ib tug siv wavelength (1653 nm, feem ntau rau kev soj ntsuam methane). Los ntawm kev soj ntsuam tsis tu ncua kev ntsuas qhov ntsuas qhov sib txawv hauv qhov kev siv wavelength channel, tus qauv no synchronously thiab raug rov tsim dua qhov tsis paub lub hauv paus ntawm lub hom phiaj wavelength txoj kev nqus dav dav. Txoj hauv kev no daws qhov kev sib tw ntawm qhov tsis muaj "cov ntsiab lus thauj tog rau nkoj" rau lub hauv paus calibration nyob rau hauv dav - spectrum gases.
Kev sim validation qhia tau hais tias nyob rau hauv dynamic kub cycling tej yam kev mob xws li los ntawm -10℃mus rau 30 degree, tus txheeb ze cag- txhais tau tias -square yuam kev ntawm no baseline reconstruction txoj kev tseem qis dua 1.63%. Thaum ua ntawv thov rau absorbance xam rau propane, butane, thiab lawv cov mixs, lub hauv paus reconstructed qhia ib tug tshaj plaws txheeb ze yuam kev ntawm tsuas yog 1.7%. Txoj haujlwm no hloov pauv qhov kev sib tw tseem ceeb hauv kev nqus ncaj qha spectroscopy rau hauv kev daws teeb meem raws li ntsuas lub cev sib raug zoo, muab txoj hauv kev tshiab rau siab -precision, tiag-lub sij hawm hauv online saib xyuas ntawm dav-spectrum absorbing gases nyob rau hauv complex industrial cheeb tsam xws li petrochemical kev ruaj ntseg ntau lawm.
