Kev sib txuas lus wireless hauv lub neej txhua hnub

Kev sib txuas lus wireless hauv lub neej txhua hnub  

Wave:● Lub ntsiab lus ntawm kev sib txuas lus yog kev sib kis ntawm cov ntaub ntawv, feem ntau yog nyob rau hauv daim ntawv ntawm nthwv dej.  ● Nthwv dej tau muab faib ua cov nthwv dej, cov nthwv dej electromagnetic, cov teeb meem tsis muaj zog thiab cov nthwv dej gravitational (quantum kev sib txuas lus).  ● Tsiaj txhu thiab nroj tsuag kawm siv suab nthwv dej, infrared thiab pom lub teeb los ntawm kev tshawb nrhiav evolutionary.

electromagnetic tsis:

Tam sim no, feem ntau siv electromagnetic nthwv dej yog qhov ua tau zoo ntawm electromagnetic yoj, uas tuaj yeem muab faib ua ob peb ntu:

● Xov tooj cua (R) (3Hz ~ 300MHz) (TV, xov tooj cua, thiab lwm yam)

● Microwave (IR) (300MHz ~ 300GHz) (radar, thiab lwm yam)

●Infrared (300GHz ~ 400THz)

● Pom pom lub teeb (400THz ~ 790THz)

● UV

● X-ray

● gamma rays

Daim Ntawv Thov Txhua Hnub:

  Bands raug faib thiab siv rau ntau lub hom phiaj, xws li AM, FM, TV tshaj tawm, kev sib txuas lus satellite, thiab lwm yam, koj tuaj yeem xa mus rau cov ntaub ntawv tseem ceeb ntawm cov teb chaws tshwj xeeb.GSM, 3G, thiab 4G yog txhua lub microwaves.

Cov satellites kuj yog kev sib txuas lus hauv microwave.Qhov zoo tshaj plaws zaus rau kev sib txuas lus satellite yog 1-10GHz zaus band, uas yog, microwave zaus band.  Txhawm rau kom ua tau raws li qhov xav tau ntau thiab ntau dua, cov zaus tshiab tau kawm thiab siv, xws li 12GHz, 14GHz, 20GHz thiab 30GHz.Huhutong yog satellite TV, pab los ntawm Zhongxing 9 satellite.Hauv lwm lo lus, lub ntim ntawm qhov kev tshaj tawm hauv xov xwm no muaj zog heev, tsuas yog mus rau lub vev xaib raug cai kom pom nws.Cov xov tooj satellite (rau kev caij nkoj thiab nkoj) yog qhov loj ntawm lub xov tooj smartphone.Bluetooth thiab wifi yog microwaves.Cov cua txias, kiv cua, thiab xim TV tej thaj chaw deb tswj yog infrared.NFC yog xov tooj cua (Nyob ze Field Communication yog luv luv, high-frequency xov tooj cua tshuab uas ua hauj lwm ntawm 13.56MHz ntawm ib tug deb ntawm 20cm).RFID tags (tsawg zaus cim (125 lossis 134.2 kHz), cov cim siab zaus (13.56 MHz), UHF tag (868 ~ 956 MHz) thiab microwave tags (2.45 GHz))