Ngesinye isikhathi esidlule, abantu abambalwa babengakwazi ukuthenga ividiyo ebusuku. Ngaphezu kwalokho, kwakungeyona into engathandeki, ngoba imithombo evamile yokukhanya ingaphazamisa ukuphumula kwabanye ebusuku, kuyilapho idla inani elikhulu kagesi. Ngesikhathi esifanayo, ngaphandle kokukhanyisa, amakhamera akhiqiza isithombe ngaphandle kokucaca okudingekile, ephazamise kakhulu. Namuhla, umkhiqizi uhlongoza ukuxazulula le nkinga ngenye indlela, usebenzisa ama-infrared projectors for video surveillance.
Yiziphi izikhanyisi ze-IR zekhamera ze-CCTV?
I-IR (noma i-infrared) izikhukhula ziyidivayisi yokukhanyisa esebenza eziningi zama-LED. Bayizikhulu ngobukhulu. Kodwa into esemqoka akulona lokhu. Isikhanyiso se-IR sisebenzisa ama-LED angajwayelekile, kodwa imisebe ye-infrared. Njengoba kunezintambo ezingamaphesenti angu-940-950 nm, ama-LED anjalo awekho kuleyo ngxenye yembonakude ebonakala emehlweni. Lokhu kusho ukuthi esimweni esishintshayo umshini we-IR umgwaqo awuphazamisi neze izakhamuzi eziseduzane nekhamera futhi akukali ukunakekelwa kwabangenayo. Kulokhu, amakhamera e-CCTV alokho okwenzekayo ngezinga eliphezulu lokucaca.
Ngaphezu kwalokho, ama-LED abhekene nokusetshenziswa kwamandla aphansi, naphezu kokuthi abasebenza kulo lonke ubusuku. Lokhu kuzogcina ngokukhululekile kuma-akhawunti wezinsiza zamandla kubanikazi bezokuhweba ezinkulu, igaraji noma indawo yehhovisi.
Ungakhetha kanjani ukukhanya kwe-IR kokuqapha ividiyo?
Kuze kube yimanje, imakethe ekhethekile kakhulu iboniswa yi-assortment enkulu, ukukhetha okulungile ngokuvamile kuba nzima kakhulu.
Enye yezinqubo ezibaluleke kakhulu zokuthenga yilezi zindebe. Uma ufuna ukuthi i -jectject ingabonakali ngokuphelele, udinga ukuthola imikhiqizo ene-indicator engaba ngu-900 nm nangaphezulu. Uma ufaka i-IR-injector ngobubanzi obukhulu be-700 kuya ku-850 nm, khona-ke ubumnyama obuphelele kuyokwazi ukucabangela ukukhanya okubuthakathaka kwe-backlight.
Olunye uhla lwamapharamitha - lubonisa ibanga lapho idivaysi ehlukanisa ngokucacile isibalo somuntu. Noma kunjalo, le nkhomba ixhomeke ekuzweleni kwekhamera ngokwayo, kanye nesinqumo sayo. Amaphrosesa ase-long-age angama-40 angafaka cishe amamitha angu-40, amancane - amamitha angu-10 kuphela.
Kusukela ekukhanyeni kwe-IR-injector futhi kuncike ekutheni indawo ikhanya kanjani, ngakho-ke i-angle yekhamera. Ngokujwayelekile isibonakaliso sihluka kusuka kuma-20 kuya ku-60 degrees.
Iprojector ye-infrared inikezwa kusuka emanzini nge-voltage ye-volts ayi-12.