一、紅外濾光片是什么
紅外濾光片是一種(zhong)可以(yi)屏蔽紫外(wai)光(guang)(guang)(guang)、可見光(guang)(guang)(guang),僅透紅外(wai)光(guang)(guang)(guang)的光(guang)(guang)(guang)學(xue)濾光(guang)(guang)(guang)片(pian)。在光(guang)(guang)(guang)學(xue)領(ling)域(yu)中(zhong)紅外(wai)濾光(guang)(guang)(guang)片(pian)一般(ban)是由光(guang)(guang)(guang)學(xue)玻璃鍍膜(mo)、光(guang)(guang)(guang)學(xue)塑料(liao)(如(ru)PC及(ji)PMAA)或光(guang)(guang)(guang)學(xue)璃片(pian)再加入特(te)種(zhong)染料(liao)做(zuo)成的有色玻璃濾光(guang)(guang)(guang)片(pian),上述工藝的濾光(guang)(guang)(guang)片(pian)只能(neng)讓紅光(guang)(guang)(guang)通過,宏觀上講(jiang)都是紅外(wai)濾光(guang)(guang)(guang)片(pian)。
紅(hong)外(wai)濾光(guang)片主要應(ying)(ying)用于(yu)安(an)防監控(kong)領域(yu),紅(hong)外(wai)氣體(ti)分(fen)析儀,夜視產品(pin)(pin),紅(hong)外(wai)探(tan)測器(qi),紅(hong)外(wai)接收(shou)機(ji),紅(hong)外(wai)感應(ying)(ying),紅(hong)外(wai)通訊產品(pin)(pin)。具體(ti)到(dao)產品(pin)(pin)比如:監控(kong)攝相機(ji),遙控(kong)器(qi),紅(hong)外(wai)幕墻(qiang)產品(pin)(pin),紅(hong)外(wai)感應(ying)(ying)馬桶、水(shui)龍頭、洗手液裝置(zhi),紅(hong)外(wai)測溫(wen)器(qi),紅(hong)外(wai)打印機(ji),交互式電(dian)子白板,紅(hong)外(wai)觸(chu)摸屏,指紋識(shi)別(bie)機(ji),人臉識(shi)別(bie)系統等。
二、紅外濾光片的分類
從材料上劃分,有(you)光學玻璃鍍膜(mo)的(de),也有(you)有(you)色(se)玻璃制成的(de),也有(you)塑料紅外濾光片。這里所(suo)指的(de)是近紅外濾光片。如果涉(she)及到(dao)中遠紅外,材料還有(you)Si,ZnSe,Sapphire,CaF2,石英(ying)玻璃等。
從光學特性上來劃分,有長波通型IR long pass filter和帶通型IR bandpass filter。其中長波通型,包括以下幾種:
1、有(you)色玻璃(li)制作而成,通常為黑色,比如IPG-800。它將(jiang)可見(jian)光吸(xi)收,允許(xu)透過(guo)紅(hong)外光。如果透過(guo)此紅(hong)外濾光片去看(kan)太陽(yang)(yang),依然(ran)可以看(kan)見(jian)一(yi)個紅(hong)紅(hong)的太陽(yang)(yang)。適(shi)合用于紅(hong)外呈像。
2、在(zai)光(guang)(guang)學(xue)白玻璃(li)上通過(guo)真空鍍膜制成(cheng)紅(hong)外(wai)濾(lv)光(guang)(guang)片,比如IPGC-720,這種類(lei)型的又叫光(guang)(guang)學(xue)冷鏡,它將可見光(guang)(guang)反射(she),讓紅(hong)外(wai)光(guang)(guang)透過(guo)。外(wai)觀看起(qi)來是銀色的,像是一面鏡子。如果(guo)是中遠紅(hong)外(wai)的濾(lv)光(guang)(guang)片,要在(zai)Si,Sapphire,石(shi)英玻璃(li)上鍍膜。
3、由特種塑料(liao)(liao)制成的(de)紅外塑料(liao)(liao)濾光片(pian)(pian),外觀黑色,如果(guo)透過(guo)此紅外濾光片(pian)(pian)去看太陽,也(ye)可以(yi)(yi)看見一個紅紅的(de)太陽。這種塑料(liao)(liao)的(de)材料(liao)(liao)可以(yi)(yi)是PC也(ye)可以(yi)(yi)是PMMA。
再說帶通型,帶通濾光片都是由真空(kong)鍍膜而成。對(dui)于近(jin)紅(hong)外(wai)(wai)的帶(dai)通來說,是在(zai)白玻璃上(shang)鍍膜。如果是中(zhong)遠紅(hong)外(wai)(wai),則會(hui)在(zai)Sapphire上(shang)鍍膜。其中(zhong)近(jin)紅(hong)外(wai)(wai)的帶(dai)通濾(lv)光(guang)片相(xiang)(xiang)應的光(guang)源主(zhu)要(yao)(yao)是紅(hong)外(wai)(wai)IR LED和紅(hong)外(wai)(wai)激(ji)光(guang),所以主(zhu)要(yao)(yao)波長有808nm,850nm,905nm,940nm,1064nm,也有不常(chang)用(yong)的780nm。所以常(chang)用(yong)的近(jin)紅(hong)外(wai)(wai)濾(lv)光(guang)片的波長主(zhu)要(yao)(yao)就(jiu)是這些。相(xiang)(xiang)應的型號(hao)有BPF-850,NBF-808,BPF-940。