Âng-gōa-sòaⁿ

Ēng tiong âng-goā-soàⁿ hip ê kaú-á. (sek-tī ū choán-oāⁿ--koè)

Âng-gōa-sòaⁿ (infrared) tiāⁿ kán-siá IR, sī 1 chióng tiān-chû-pho, i ê pho-tn̂g khah tn̂g khoàⁿ-ū-kng, khah té bô-soàⁿ-tiān-pho (radio wave). Khoàⁿ-ū-kng pho-tn̂g siōng tn̂g ê sek sī âng-sek, âng-goā-soàⁿ pho-tn̂g phēng âng-sek koh khah tn̂g, m̄-chiah hō chit hō miâ. Âng-goā-soàⁿ ê pho-tn̂g iok-liōng ùi 750 nm kaù 1 mm.