Lub hauv paus ntsiab lus ntawm Photochromic Lenses
Lub hauv paus ntsiab lus ntawmphotochromic lo ntsiab muagFeem ntau tso siab rau cov tshuaj tiv thaiv tshwj xeeb ntawm cov kab hluav taws xob ultraviolet.
Cov tsom iav tsom iav photochromic muaj ntau lab tus molecules ntawm qee yam tshuaj, xws li nyiaj chloride lossis silver halide. Pom pom lub teeb, ib feem ntawm cov khoom siv teeb pom kev zoo, nkag mus rau cov molecules thaum tsis muaj UV teeb. Tab sis thaum raug lub hnub ci ultraviolet rays, cov molecules tau txais cov txheej txheem tshuaj uas hloov lawv cov duab. Cov qauv tshiab molecular absorbs qee qhov pom lub teeb, ua rau lub lens tsaus. Tus naj npawb ntawm cov molecules uas nws cov duab hloov pauv nrog kev siv ntawm UV teeb.
Thaum koj tuaj sab hauv tsev thiab tawm ntawm UV rays, cov tshuaj hloov pauv hloov pauv yuav tshwm sim. Thaum dheev tshem tawm ntawm lub teeb ultraviolet, cov molecules yuav sai sai rov qab mus rau lawv cov qauv qub, yog li poob lawv lub teeb-absorbing zog. Txawm hais tias nws yog qhov kev hloov pauv zoo lossis kev hloov tsis zoo, tag nrho cov txheej txheem tshwm sim sai heev.
Hauv Corning's PhotoBrown thiab PhotoGrey kab los ntawm xyoo 1960, cov lo ntsiab muag tau ua los ntawm iav nrog cov molecules sib npaug faib thoob plaws lub lens. Cov teeb meem uas nws tshwm sim tau tshwm sim thaum siv cov qauv no hauv cov tshuaj tsom iav, vim tias qhov tuab ntawm qhov sib txawv ntawm cov tshuaj pleev ib ce tuaj yeem sib txawv, nrog cov cheeb tsam me me ntawm qhov tsaus nti. Tab sis nrog cov koob npe nrov ntawm cov lo ntsiab muag yas, ib txoj kev tshiab tau tsim. Los ntawm soaking cov yas lo ntsiab muag nyob rau hauv cov tshuaj da dej, cov xim-hloov molecules yuav absorbed rau hauv lub lens yas mus rau ib tug tob ntawm txog 150 microns. Txoj kev tshiab no zoo dua li cov txheej txheem txheej txheej yooj yim uas cov xim hloov pauv tsuas yog 5 microns tuab, uas tsis muab cov molecules txaus los ua kom lub ntsej muag tsaus. Kev hloov pauv, tus thawj coj hauv kev tsim cov lens photochromic, tau nrov rau cov txheej txheem yas lo ntsiab muag adsorption.
