Calibration Methods ntawm Polarizers rau Polarizing Microscopes
Hauv kev ua haujlwm zoo, cov lus qhia kev vibration ntawm sab sauv thiab sab polarizing tsom iav ntawm polarizing microscope yuav tsum yog orthogonal rau ib leeg, los yog nyob rau sab hnub tuaj -west thiab sab qaum teb- sab qab teb kev taw qhia, feem, raws li cov transverse thiab longitudinal cov lus qhia ntawm crosshair ntawm lub eyepiece. Qee lub sij hawm tsuas yog ib qho qis polarizer yog siv rau kev soj ntsuam, thiab kev co kev taw qhia ntawm lub polarizer qis yuav tsum tau txiav txim siab, yog li cov polarizer yuav tsum tau ntsuas thaum ua haujlwm.
(1) Kev tshawb pom ntawm crosshair hauv eyepiece
Feem ntau, nws yog ib qho tsim nyog los xyuas seb qhov crosshair ntawm lub eyepiece yog orthogonal thiab ua raws li kev vibration kev taw qhia ntawm sab sauv thiab sab polarizing tsom iav. Nyob rau tib lub sij hawm, xaiv ib daim ntawm biotite nrog ua tiav cleavage, txav mus rau qhov chaw ntawm crosshair ntawm lub eyepiece, ua rau lub cleavage seam thaum uas tig mus rau ib tug ntawm cov crosshair xov hlau, sau cov scale tus naj npawb ntawm theem, thiab ces tig lub theem kom lub cleavage seam nyob rau tib lub sij hawm mus rau lwm yam crosshair. Sau tus lej ntsuas ntawm theem. Qhov sib txawv ntawm ob qhov kev nyeem ntawv yog 90 degree, qhia tias tus ntoo khaub lig yog orthogonal.
(2) Kev txiav txim siab thiab kho qhov kev co kev taw qhia ntawm daim iav polarizing
Feem ntau, biotite yog siv los xyuas cov kev taw qhia kev co ntawm cov polarizers, vim biotite yog cov pob tshab pob tshab uas muaj cov yam ntxwv zoo heev hauv ib qho polarization. Ua ntej, nrhiav ib qho ntshiab thiab cleaved piece ntawm biotite, txav nws mus rau hauv nruab nrab ntawm lub crosshair ntawm lub eyepiece, thawb tawm lub sab sauv polarizer, tig lub theem ib zaug, thiab saib cov xim hloov ntawm biotite. Vim hais tias biotite absorbs lub teeb vibration nyob rau hauv cov kev taw qhia cleavage muaj zog, thaum cov xim ntawm biotite nce mus txog qhov tob, cov kev taw qhia ntawm lub cleavage seam yog kev co kev taw qhia ntawm sab polarizer.
(3) Kho ntawm orthogonal polarization ntawm sab sauv thiab qis polarizing iav
Tom qab ua raws cov kev taw qhia ntawm lub polarizer qis, tshem tawm cov yeeb yaj kiab nyias, thawb lub polarizer sab saud, thiab saib seb qhov chaw saib puas yog dub, uas yog, txawm tias nws yog nyob rau hauv lub xeev extinction. Yog tias nws yog tag nrho cov xim dub, nws qhia tau hais tias kev vibration ntawm sab sauv thiab sab polarizations yog orthogonal rau ib leeg. Txwv tsis pub, lub sab sauv polarizer yuav tsum tau calibrated los ntawm rotating nws kom txog rau thaum lub teb ntawm kev pom yuav tsaus. Thaum rotating, nres ntsia hlau ntawm lub polarizer sab sauv yuav tsum tau loosened ua ntej, calibrated kom raug, thiab ces nruj.
