Xa kuthengwa ikhamera ye-infrared, abasebenzisi bahlala bebuza umbuzo: ingaba ikhamera ye-infrared thermal endiyithengileyo inokubona kude kangakanani? Okanye kufuneka ndichonge umfanekiso oshushu oneeparamitha umntu ekufuneka azikhethe kwiimitha ezingama-500?

Enyanisweni, lo ngumba obaluleke kakhulu kodwa onzima ukuwucacisa. Umzekelo, ikhamera nganye yokujonga i-thermal inokubona ilanga kumgama oziikhilomitha ezili-150, kodwa akunakutshiwo ukuba umgama wokubonwa kwekhamera yokujonga i-thermal unokufikelela kwi-150 lezigidi zeekhilomitha. Nangona kunjalo, umgama wokubona kufuneka ucaciswe kubasebenzisi, kuba abasebenzisi bathenga imifanekiso eshushu ukuze babone kwaye babeke iliso kwiithagethi. Ngoko ke, sidinga injongo kunye nomgangatho onokulinganiswa ukubala umgama ekujoliswe kuwo.

UJohnson wasixelela umthetho kwisemina yokuqinisa umfanekiso wobusuku bokuqala eyayibanjwe ngo-Okthobha 1958. Makhe sijonge indlela yokumisela umgama ekujoliswe kuwo.

Ikhrayitheriya kaJohnson: umgama wokufumanisa yisiphumo sesenzo esidibeneyo sezinto ezizimeleyo kunye nenjongo. Imiba eyintloko inxulumene nesayikholoji yokubona yombukeli, amava kunye nezinye izinto. Ukuphendula "ukude kangakanani ukubona ikhamera ye-thermal", kufuneka siqale sifumane "into ecacileyo". Umzekelo, xa ubhaqa ithagethi, uMntu A ucinga ukuba icacile, kodwa uMntu B usenokucinga ukuba ayicacanga. Ngoko ke, kufuneka kubekho umgangatho wovandlakanyo olunenjongo nolumanyeneyo. UJohnson wanxulumanisa ingxaki yokufunyaniswa kwethagethi kunye nokufunyanwa komphetho olinganayo ngokovavanyo. Uphononongo oluninzi lubonise ukuba kunokwenzeka ukusebenzisa isisombululo somphetho olinganayo ekujoliswe kuwo ukumisela isakhono sokuqatshelwa kwethagethi ye-infrared thermal imaging system ngaphandle kokuqwalasela ubume bethagethi kunye neziphene zemifanekiso, eyi "Johnson Criterion".

Ukufunyaniswa okujoliswe kuko kunokwahlulwa kube ngamanqanaba amathathu: ukufumanisa, ukuqaphela kunye nokuqatshelwa.

Ukufunyanwa

Ukufumanisa kuchazwa njengokufumana into ekujoliswe kuyo kwindawo yokujonga. Ngeli xesha, umfanekiso wethagethi kufuneka uphendule ngaphezu kweepikseli ezi-1.5 kwinqanaba elibalulekileyo.

Ukuqatshelwa

Ukuqwalaselwa kuchazwa njengoku: ekujoliswe kuko kungahlelwa, kwaye ekujoliswe kuko kunokuchongwa njengetanki, ilori okanye umntu. Oku kukuba umfanekiso wethagethi kufuneka uhlale ngaphezu kwe-pixels ezi-6 kwicala elibalulekileyo lobungakanani.

Ukuchongwa

Inkcazo yokuchonga kukuba iyakwazi ukwahlula imodeli kunye nezinye iimpawu zethagethi, njengotshaba kunye nathi. Oku kukuba umfanekiso wethagethi kufuneka uphendule ngaphezu kweepikseli ezili-12 kwicala elibalulekileyo lobungakanani.

Ifomula yokubala

Emva kokwazi iikhonsepthi kunye nezikhokelo, ungaqala elona zibalo:

Ngokubanzi, ikhamera yokulinganisa iqondo lobushushu inokulinganisa ngokuchanekileyo iqondo lobushushu, elifuna ngokubanzi iipikseli ezili-9, ngelixa ukuqondwa kufuna iipikseli ezi-6 kuphela, ngoko ke umgama oqikelelweyo unokubalwa ngale fomula ilandelayo:

Elona cala lide lethagethi ÷ [(ubungakanani bepixel yesichopheli ÷ ubude bojoliso lwelensi) × Iipikseli zokwalatha komlinganiselo obalulekileyo]= χ km

Imizekelo: isithuba sepikseli somjongi we-thermal 12 μm. Khetha 20mm ubude belensi yojoliso:

Umgama wokuqatshelwa kwabantu malunga ne-1.7m yi-1.7 ÷ [(12 ÷ 20) × 6)]=0.472km; Umgama onokuthi ulinganise ngokufanelekileyo ubushushu yi-1.7 ÷[ (12 ÷ 20) × 9]=0.315km

Umgama wokuchongwa kwesithuthi yi-2.3m yi-2.3 ÷ [(12 ÷ 20) × 6)]=0.639km; Umgama onokulinganisa ngokufanelekileyo ubushushu yi-2.3 ÷ [(12 ÷ 20) × 9]=0.430km

Umgama wokuchonga we-6-meter umkhumbi weziko yi-6.0 ÷ [(12 ÷ 20) × 6)]=1.667km; Umgama onokuthi ulinganise ngokufanelekileyo ubushushu yi-6.0 ÷ [(12 ÷ 20) × 9]=1.111km

Emva kokuqonda, ngaba unokubala? Ukuba awukaqondi, ungaqhagamshelana sales@viewsheen.com kwaye uvumele iingcali zibalele. Kwakhona lukhetho oluhle!