Nthaŵi ina yapitayi, anthu ochepa amatha kutenga kanema usiku. Kuwonjezera pamenepo, zinali zosokoneza, chifukwa magetsi omwe amatha kukhalapo angayambitse kupuma usiku kwa ena, pamene akudya magetsi ambiri. Pa nthawi yomweyi, popanda kuyang'anitsitsa, makamera amaberekana chithunzi popanda kufunikira koyenera, zovuta kwambiri. Masiku ano, wopanga akukonza kuthetsa vutoli mwanjira ina, pogwiritsa ntchito majekesi opangira mavidiyo.
Kodi zizindikiro za IR za makamera a CCTV ndi ziti?
Majekesero a IR (kapena infrared) ndi chipangizo chowala chimene chimagwira pa mababu ambiri a LED. Ndizochepa kwambiri. Koma chinthu chachikulu si ichi. IR yowunikira imagwiritsa ntchito ma LED omwe sadziwa, koma miyendo yamoto. Pokhala ndi mawonekedwe okwana 940 -950 nm, ma LED oterewa sagwera mu gawolo la maonekedwe omwe amawonekera ku diso la munthu. Izi zikutanthawuza kuti muzasintha pazomwe msewu IR projector sungasokoneze anthu okhala m'nyumba zomwe zili pafupi ndi kamera ndipo sichikopa chidwi cha othawa. Pankhaniyi, makamera a CCTV amalemba zomwe zikuchitika ndi msinkhu wachinsinsi.
Kuonjezera apo, ma LED ali ndi mphamvu yochepa yogwiritsira ntchito mphamvu, ngakhale kuti amagwira ntchito usiku wonse. Izi zidzasunga kwambiri pa nkhani za mphamvu zamagetsi kwa eni eni malonda aakulu, malo osungirako katundu kapena malo ogwira ntchito.
Kodi mungasankhe bwanji IR pakuwonetsera kanema?
Mpaka pano, msika wapadera kwambiri umaimiridwa ndi zikuluzikulu zambiri, kusankha bwino kumakhala kovuta kwambiri.
Chinthu chimodzi chofunika kwambiri pa kugula ndi mawonekedwe a wavelength. Ngati mukufuna kuti injectionyo ikhale yosadziwika, muyenera kupeza mankhwala okhala ndi chizindikiro cha 900 nm ndi apamwamba. Ngati mutayika IR -jectjector ndi mawonekedwe a 700 mpaka 850 nm, ndiye kuti mumdima wadzaoneni mungathe kuganizira kuwala kofooka kwawunikira.
Njira ina yowunika - imayeza mtunda umene chipangizocho chimasiyanitsira momveka bwino chifaniziro cha munthu. Komabe, chizindikiro ichi chimadalira kukhudzidwa kwa kamera palokha, komanso chisankho chake. Majekesi aakulu a IR akhoza kuphimba pafupifupi mamita 40, ang'onoang'ono - mamita 10 okha.
Kuchokera kumbali ya kuunikira kwa IR-injector kumadaliranso momwe dera likuwunikira, motero mbali ya kamera. Kawirikawiri chizindikirochi chimasiyanasiyana ndi madigiri 20 mpaka 60.
Pulojekiti yamakono imachokera ku maunyolo ndi voltage ya 12 volts.