Organic Structure Analysis thiab Infrared Chromatograph
Thaum peb thawj zaug hnov lub npe ntawm infrared chromatograph, nws yuav tsum tau hais nyob rau hauv cov ntaub ntawv chemistry uas nws tuaj yeem siv los ntsuas cov kev ua haujlwm ntawm cov organic teeb meem. Lub hauv paus ntsiab lus yog vim tias cov qauv sib txawv nqus lub teeb infrared mus rau qhov sib txawv, uas yog cuam tshuam rau hauv spectrum. Nws tuaj yeem siv rau kev txheeb xyuas.
1.Prism thiab grating spectrometer
Nws belongs rau ib tug dispersive spectrometer. Nws monochromator yog prism lossis grating. Nws yog ib qho kev ntsuas ib-channel, uas yog, tsuas yog ib qho nqaim-band spectral ntsiab yog ntsuas ib zaug. Tom qab tig lub prism los yog grating thiab hloov nws taw tes taw tes los ntawm taw tes, lub spectral tis ntawm lub teeb qhov chaw yuav ntsuas.
2. Fourier hloov infrared spectrometer
Nws tsis yog-dispersive, qhov tseem ceeb yog ob-nqaj cuam tshuam, feem ntau siv yog Michelson interferometer. Thaum lub iav txav txav mus, txoj kev kho qhov muag qhov sib txawv ntawm ob lub teeb ci sib txuas dhau los ntawm kev hloov pauv ntawm interferometer, thiab lub teeb siv lub teeb ntsuas los ntawm tus ntes kuj hloov pauv, yog li tau txais cov qauv cuam tshuam. Tom qab kev ua lej ntawm Fourier hloov pauv, qhov spectrum B(v) ntawm qhov teeb meem tshwm sim tau txais.
Fourier hloov infrared spectrometer
Lub ntsiab zoo ntawm Fourier transform spectrometer yog:
1 multi-channel ntsuas kev txhim kho teeb liab-rau-suab nrov piv;
2 Tsis muaj kev txwv nkag thiab tawm, yog li lub luminous flux siab, uas txhim kho qhov rhiab heev ntawm qhov ntsuas;
3 Nrog lub laser wavelength ntawm helium thiab neon raws li tus qauv, qhov tseeb ntawm tus nqi nthwv dej tuaj yeem ncav cuag 0.01 cm;
4 nce qhov kev ncua deb ntawm daim iav txav los txhim kho qhov kev daws teeb meem;
5 ua haujlwm band tuaj yeem txuas ntxiv los ntawm thaj chaw pom mus rau thaj tsam millimeter, ua rau kev txiav txim siab ntawm qhov deb infrared spectroscopy
Ntau yam infrared spectrometers tau piav qhia saum toj no tuaj yeem ntsuas ob qho tib si emission spectrum thiab qhov nqus los yog kev cuam tshuam spectrum. Thaum ntsuas qhov emission spectrum, tus qauv nws tus kheej yog siv los ua lub teeb ci; Thaum ntsuas qhov nqus los yog qhov cuam tshuam, lub teeb tungsten halogen, Nernst teeb, silicon carbon pas nrig, thiab lub teeb kub siab mercury (rau thaj tsam deb infrared) yog siv los ua lub teeb ci. Cov cuab yeej siv feem ntau suav nrog cov khoom siv hluav taws xob thiab cov duab thaij duab. Cov qub suav nrog Gaolai pas dej, thermocouple, triglycine sulfate, triglyceride sulfate, thiab lwm yam.; tom kawg muaj mercury cadmium telluride, lead sulfide, thiab antimony telluride. Feem ntau siv cov ntaub ntawv qhov rais yog sodium chloride, potassium bromide, barium fluoride, lithium fluoride, calcium fluoride, uas yog haum rau thaj tsam ze thiab nruab nrab-infrared. Ib daim ntawv polyethylene lossis polyester zaj duab xis tuaj yeem siv rau hauv cheeb tsam deb infrared. Tsis tas li ntawd, hlau coated iav feem ntau yog siv los siv lo ntsiab muag.
