Video: Dab tsi yog retardation hauv optical mineralogy?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev txhais ntawm kev poob qab . Hauv crystal optics , tus nqi los ntawm qhov uas qeeb yoj ntog tom qab lub nrawm nthwv dej thaum dhau los ntawm anisotropic siv lead ua phaj. Kev poob qab nyob ntawm phaj thickness thiab qhov sib txawv ntawm refractive indices ntawm nws ob lub ntsiab lus qhia.
Ua raws li qhov no hauv kev txiav txim siab, dab tsi yog optical path retardation?
Nws yuav siv sij hawm lub hnub ci qeeb ntev dua kom hla cov siv lead ua dua li nws siv txoj kab hluav taws xob nrawm. Txoj kab hluav taws xob nrawm yuav dhau los ntawm cov siv lead ua thiab tau mus deb li deb ∆ dhau ntawm cov siv lead ua ua ntej cov kab hluav taws xob qeeb mus txog ntawm cov khoom siv lead ua. Qhov kev ncua deb ∆ hu ua kev poob qab.
Qhov thib ob, dab tsi yog cov khoom siv birefringent? Birefringence yog cov cuab yeej kho qhov muag ntawm a khoom muaj ib tug refractive index nyob ntawm polarization thiab propagation kev taw qhia ntawm lub teeb. Cov no optically anisotropic cov ntaub ntawv hais tias yog birefringent (los yog birefractive).
Hauv qhov no, lub teeb retardation yog dab tsi?
Thaum twg teeb dhau los ntawm anisotropic cov zaub mov nws faib ua ob kab teeb uas vibrate perpendicular rau ib leeg. Qhov kev ncua deb uas qhov qeeb qeeb qeeb qeeb qeeb ntawm txoj kab hluav taws xob sai thaum lub sijhawm qeeb qeeb thaum kawg tawm ntawm cov pob zeb hauv av yog hu ua TAWS . Cov kev poob qab tuaj yeem ntsuas nyob rau hauv qhov kev ncua deb.
Vim li cas cov zaub mov birefringent tsim cov xim cuam tshuam hauv qab polarizers hla?
Vim ib yoj yog retarded nrog hwm rau lwm tus, cuam tshuam (xws li kev tsim lossis kev puas tsuaj) tshwm sim ntawm cov nthwv dej thaum lawv dhau los ntawm lub ntsuas ntsuas. Cov txiaj ntsig yog uas ib txhia birefringent cov qauv tau txais ib spectrum ntawm xim thaum pom hauv dawb lub teeb hla hla polarizers.
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