一、紅外濾光片是什么
紅外濾光片是一(yi)種可以屏(ping)蔽紫(zi)外(wai)光(guang)(guang)(guang)(guang)、可見光(guang)(guang)(guang)(guang),僅透(tou)紅外(wai)光(guang)(guang)(guang)(guang)的光(guang)(guang)(guang)(guang)學(xue)(xue)濾(lv)(lv)光(guang)(guang)(guang)(guang)片(pian)(pian)。在(zai)光(guang)(guang)(guang)(guang)學(xue)(xue)領域中紅外(wai)濾(lv)(lv)光(guang)(guang)(guang)(guang)片(pian)(pian)一(yi)般是由光(guang)(guang)(guang)(guang)學(xue)(xue)玻璃(li)(li)鍍膜、光(guang)(guang)(guang)(guang)學(xue)(xue)塑料(liao)(如PC及PMAA)或光(guang)(guang)(guang)(guang)學(xue)(xue)璃(li)(li)片(pian)(pian)再加入特種染料(liao)做(zuo)成的有色玻璃(li)(li)濾(lv)(lv)光(guang)(guang)(guang)(guang)片(pian)(pian),上(shang)述工藝的濾(lv)(lv)光(guang)(guang)(guang)(guang)片(pian)(pian)只能讓紅光(guang)(guang)(guang)(guang)通(tong)過,宏觀上(shang)講(jiang)都是紅外(wai)濾(lv)(lv)光(guang)(guang)(guang)(guang)片(pian)(pian)。
紅外(wai)濾(lv)光片主(zhu)要(yao)應(ying)用于安防監控領域(yu),紅外(wai)氣(qi)體(ti)(ti)分析儀(yi),夜視產品(pin)(pin)(pin),紅外(wai)探測器,紅外(wai)接收機(ji),紅外(wai)感(gan)應(ying),紅外(wai)通訊產品(pin)(pin)(pin)。具體(ti)(ti)到產品(pin)(pin)(pin)比如(ru):監控攝相機(ji),遙控器,紅外(wai)幕墻產品(pin)(pin)(pin),紅外(wai)感(gan)應(ying)馬桶、水龍頭、洗(xi)手液裝置,紅外(wai)測溫(wen)器,紅外(wai)打印機(ji),交互(hu)式電(dian)子(zi)白板,紅外(wai)觸摸屏,指紋識別(bie)機(ji),人臉識別(bie)系(xi)統等。
二、紅外濾光片的分類
從材料上(shang)劃分(fen),有光(guang)學玻璃鍍膜(mo)的,也有有色玻璃制成的,也有塑料紅外濾(lv)光(guang)片。這里(li)所指的是近紅外濾(lv)光(guang)片。如果涉(she)及到中遠(yuan)紅外,材料還(huan)有Si,ZnSe,Sapphire,CaF2,石(shi)英玻璃等。
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(tong)型,包括以(yi)下幾種(zhong):
1、有色玻璃(li)制作(zuo)而成,通常為黑(hei)色,比如(ru)IPG-800。它將(jiang)可見(jian)(jian)光(guang)吸(xi)收,允許透過紅(hong)(hong)外(wai)(wai)光(guang)。如(ru)果透過此紅(hong)(hong)外(wai)(wai)濾光(guang)片去看太陽,依(yi)然可以(yi)看見(jian)(jian)一個紅(hong)(hong)紅(hong)(hong)的太陽。適合用于紅(hong)(hong)外(wai)(wai)呈(cheng)像(xiang)。
2、在(zai)光(guang)(guang)學(xue)白(bai)玻璃上通過(guo)真空鍍膜制成(cheng)紅(hong)(hong)外濾光(guang)(guang)片,比如IPGC-720,這種類型的又叫光(guang)(guang)學(xue)冷鏡(jing),它將(jiang)可(ke)見光(guang)(guang)反射(she),讓紅(hong)(hong)外光(guang)(guang)透(tou)過(guo)。外觀看起來(lai)是(shi)(shi)銀色的,像是(shi)(shi)一面鏡(jing)子。如果是(shi)(shi)中遠紅(hong)(hong)外的濾光(guang)(guang)片,要(yao)在(zai)Si,Sapphire,石英玻璃上鍍膜。
3、由(you)特(te)種塑料(liao)制成的(de)紅外(wai)(wai)塑料(liao)濾(lv)光片,外(wai)(wai)觀黑色,如(ru)果透過此紅外(wai)(wai)濾(lv)光片去(qu)看太陽,也可(ke)以看見(jian)一個(ge)紅紅的(de)太陽。這種塑料(liao)的(de)材(cai)料(liao)可(ke)以是PC也可(ke)以是PMMA。
再說帶通型,帶通濾光片都是(shi)(shi)由真空鍍(du)(du)膜而成。對于近(jin)紅(hong)(hong)外(wai)的(de)(de)帶通來說,是(shi)(shi)在(zai)白玻璃上鍍(du)(du)膜。如果(guo)是(shi)(shi)中(zhong)遠紅(hong)(hong)外(wai),則會在(zai)Sapphire上鍍(du)(du)膜。其中(zhong)近(jin)紅(hong)(hong)外(wai)的(de)(de)帶通濾光片相應(ying)的(de)(de)光源(yuan)主要是(shi)(shi)紅(hong)(hong)外(wai)IR LED和紅(hong)(hong)外(wai)激光,所以(yi)主要波(bo)長有808nm,850nm,905nm,940nm,1064nm,也有不(bu)常用的(de)(de)780nm。所以(yi)常用的(de)(de)近(jin)紅(hong)(hong)外(wai)濾光片的(de)(de)波(bo)長主要就是(shi)(shi)這些。相應(ying)的(de)(de)型號有BPF-850,NBF-808,BPF-940。