一、紅外濾光片是什么
紅外濾光片是(shi)一種可以屏蔽紫外(wai)光(guang)(guang)(guang)、可見光(guang)(guang)(guang),僅透紅(hong)外(wai)光(guang)(guang)(guang)的(de)光(guang)(guang)(guang)學(xue)濾(lv)光(guang)(guang)(guang)片(pian)。在光(guang)(guang)(guang)學(xue)領(ling)域中紅(hong)外(wai)濾(lv)光(guang)(guang)(guang)片(pian)一般是(shi)由光(guang)(guang)(guang)學(xue)玻璃鍍膜、光(guang)(guang)(guang)學(xue)塑料(如(ru)PC及(ji)PMAA)或光(guang)(guang)(guang)學(xue)璃片(pian)再加入特種染料做成的(de)有色(se)玻璃濾(lv)光(guang)(guang)(guang)片(pian),上述工藝的(de)濾(lv)光(guang)(guang)(guang)片(pian)只能讓紅(hong)光(guang)(guang)(guang)通過,宏觀上講(jiang)都是(shi)紅(hong)外(wai)濾(lv)光(guang)(guang)(guang)片(pian)。
紅(hong)(hong)外(wai)(wai)(wai)(wai)濾光片(pian)主(zhu)要應用于安防監(jian)(jian)控領域,紅(hong)(hong)外(wai)(wai)(wai)(wai)氣體分(fen)析儀(yi),夜視產品,紅(hong)(hong)外(wai)(wai)(wai)(wai)探測器,紅(hong)(hong)外(wai)(wai)(wai)(wai)接收機,紅(hong)(hong)外(wai)(wai)(wai)(wai)感應,紅(hong)(hong)外(wai)(wai)(wai)(wai)通訊產品。具體到(dao)產品比如:監(jian)(jian)控攝相機,遙控器,紅(hong)(hong)外(wai)(wai)(wai)(wai)幕墻產品,紅(hong)(hong)外(wai)(wai)(wai)(wai)感應馬桶、水龍頭、洗(xi)手(shou)液裝置,紅(hong)(hong)外(wai)(wai)(wai)(wai)測溫器,紅(hong)(hong)外(wai)(wai)(wai)(wai)打印機,交(jiao)互(hu)式電子(zi)白板(ban),紅(hong)(hong)外(wai)(wai)(wai)(wai)觸(chu)摸屏,指紋識別(bie)機,人臉識別(bie)系統等。
二、紅外濾光片的分類
從(cong)材(cai)料(liao)上劃分,有(you)光(guang)學玻璃鍍膜(mo)的(de)(de),也有(you)有(you)色玻璃制成的(de)(de),也有(you)塑料(liao)紅外(wai)濾(lv)光(guang)片(pian)。這里所指的(de)(de)是近紅外(wai)濾(lv)光(guang)片(pian)。如果(guo)涉(she)及(ji)到中(zhong)遠紅外(wai),材(cai)料(liao)還有(you)Si,ZnSe,Sapphire,CaF2,石英玻璃等(deng)。
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(qi)中(zhong)長波通型,包括以下幾種(zhong):
1、有(you)色玻璃制作而成,通常為黑色,比如IPG-800。它將可見光(guang)吸收(shou),允許透過(guo)紅(hong)(hong)外光(guang)。如果透過(guo)此紅(hong)(hong)外濾(lv)光(guang)片(pian)去看(kan)太陽(yang),依然可以看(kan)見一個紅(hong)(hong)紅(hong)(hong)的(de)太陽(yang)。適合(he)用(yong)于紅(hong)(hong)外呈像。
2、在光(guang)學白(bai)玻璃(li)上通過(guo)真(zhen)空鍍(du)膜制(zhi)成紅(hong)(hong)外濾光(guang)片,比如IPGC-720,這種類(lei)型(xing)的(de)又(you)叫光(guang)學冷鏡,它將可(ke)見光(guang)反(fan)射(she),讓(rang)紅(hong)(hong)外光(guang)透過(guo)。外觀看起(qi)來是銀色的(de),像是一面(mian)鏡子(zi)。如果是中遠(yuan)紅(hong)(hong)外的(de)濾光(guang)片,要在Si,Sapphire,石英玻璃(li)上鍍(du)膜。
3、由特種塑(su)料制成的(de)紅外塑(su)料濾(lv)光片,外觀黑(hei)色,如果(guo)透過此紅外濾(lv)光片去看太陽,也(ye)(ye)可以(yi)看見一個紅紅的(de)太陽。這種塑(su)料的(de)材料可以(yi)是(shi)PC也(ye)(ye)可以(yi)是(shi)PMMA。
再說帶通型,帶通濾光片都是(shi)由(you)真空鍍膜(mo)(mo)而成。對于(yu)近(jin)(jin)紅(hong)外(wai)的(de)(de)(de)帶(dai)通來說,是(shi)在白玻(bo)璃上鍍膜(mo)(mo)。如果是(shi)中遠紅(hong)外(wai),則會在Sapphire上鍍膜(mo)(mo)。其中近(jin)(jin)紅(hong)外(wai)的(de)(de)(de)帶(dai)通濾光(guang)片相應的(de)(de)(de)光(guang)源主(zhu)要是(shi)紅(hong)外(wai)IR LED和紅(hong)外(wai)激光(guang),所以(yi)主(zhu)要波長(chang)有808nm,850nm,905nm,940nm,1064nm,也有不常(chang)用的(de)(de)(de)780nm。所以(yi)常(chang)用的(de)(de)(de)近(jin)(jin)紅(hong)外(wai)濾光(guang)片的(de)(de)(de)波長(chang)主(zhu)要就是(shi)這些(xie)。相應的(de)(de)(de)型號有BPF-850,NBF-808,BPF-940。