Chiyambi cha Mafotokozedwe a Magwiridwe a Ntchito a Sefa - Mutu 2

Popeza zosefera, monga chinthu china chilichonse chopangidwa ndi anthu, sizingapangidwe kuti zigwirizane ndi zomwe zili m'bukuli, pali zinthu zina zomwe ziyenera kufotokozedwa. Pa zosefera za narrowband, magawo akuluakulu omwe ayenera kuperekedwa ndi awa: kutalika kwa nthawi yayitali, kufalikira kwa nthawi yayitali, ndi bandwidth, chifukwa pafupifupi ntchito zonse zikamafika pamwamba zimakhala bwino, ndipo nthawi zambiri zimakhala zokwanira kunena malire ake otsika. Pa kulekerera kwa nthawi yayitali pali zinthu ziwiri zazikulu. Choyamba ndi kufanana kwa kutalika kwa nthawi yayitali pamwamba pa fyuluta. Nthawi zonse padzakhala kusiyana kwina, ngakhale kochepa kwambiri, kudutsa filimuyo, koma malire ayenera kuperekedwa. Chachiwiri, cholakwika poyesa kutalika kwa nthawi yayitali pamwamba pa dera lonse la fyuluta. Izi nthawi zambiri zimakhala zabwino, kotero kuti fyuluta ikhoza kupendekeka nthawi zonse kuti igwirizane ndi kutalika koyenera kwa nthawi. Pa bandwidth yoperekedwa, kuchuluka kwa kupendekeka komwe kumaloledwa mu ntchito iliyonse kudzatsimikiziridwa kwambiri ndi kukula ndi malo owonera dongosolo, chifukwa pamene ngodya yopendekeka ikukwera, ma angles onse omwe fyuluta ingavomereze amachepa.

Bandwidth ya fyuluta iyeneranso kufotokozedwa ndikupatsidwa chilolezo, koma chifukwa cha zovuta zowongolera bandwidth molondola kwambiri, nthawi zambiri sizingatheke kuchepetsa bandwidth mosamala kwambiri, ndipo chilolezocho chiyenera kukhala chachikulu momwe zingathere, nthawi zambiri osachepera 0.2 kuposa mtengo wolinganizidwa, pokhapokha ngati pali chofunikira chapadera pa icho.
Chinthu china chofunikira mu optical performance index ndi cutoff mu cutoff region, chomwe chingatanthauzidwe m'njira zosiyanasiyana, kaya ngati avareji ya transmittance pa range yonse, kapena ngati absolute transmittance pa range yonse pa wavelength iliyonse, zomwe zonse zingapereke malire apamwamba. Choyamba nthawi zambiri chimagwiritsidwa ntchito pamene gwero la kusokoneza ndi continuous spectrum, chachiwiri kupita ku line source, momwemonso wavelength yomwe yagwiritsidwa ntchito, ngati imadziwika, iyenera kufotokozedwa.
Njira ina yosiyana kwambiri yofotokozera momwe fyuluta imagwirira ntchito ndikujambula ma envulopu apamwamba komanso ochepera a kusiyana kwa transmittance ndi wavelength. Kuchita kwa fyuluta sikuyenera kugwera kunja kwa dera lomwe laphimbidwa ndi envulopu; ndikofunikira kuti ngodya yolandirira fyuluta itchulidwenso. Mtundu uwu wa metric ndi womveka bwino kuposa woyamba womwe watchulidwa pamwambapa, komabe, cholakwika chimodzi cha kufotokozera kwa metric iyi ndikuti njirayo imafotokoza ulalo uliwonse mwatsatanetsatane, zomwe zingakhale zovuta kwambiri pogwiritsa ntchito mtengo wapakati kungakhale koyenera. Kuphatikiza apo, sizingatheke kupanga mayeso kuti mudziwe ngati fyuluta ikukwaniritsa mtundu uwu wa metric wokwanira, ndipo bandwidth yochepa ya chida choyesera imatha kukhala ndi zotsatira. Chifukwa chake, ngati mafyuluta afotokozedwa motere, tikukulimbikitsani kuti mulembe kuti magwiridwe antchito a fyuluta omwe afotokozedwa pa wavelength iliyonse ndi avareji ya magwiridwe antchito nthawi zina. Kawirikawiri, mafotokozedwe a ma optical performance metrics apangidwa popanda kufunikira ma subs owonjezera. Mu ntchito iliyonse imodzi, zinthuzi zidzasonyeza kufunika kosiyanasiyana, ndipo nkhani iliyonse iyenera kuganiziridwa kwambiri malinga ndi zolinga zake. N'zoonekeratu kuti m'munda uno ndikofunikira kuti ntchito ya wopanga makina ikhale yogwirizana kwambiri ndi ya wopanga zosefera.

– Nkhaniyi yatulutsidwa ndiwopanga makina ophikira vacuumGuangdong Zhenhua