一、紅外濾光片是什么

紅外濾光片是一(yi)種可以屏蔽紫外光(guang)(guang)、可見(jian)光(guang)(guang)，僅透紅(hong)(hong)外光(guang)(guang)的(de)光(guang)(guang)學濾(lv)(lv)光(guang)(guang)片(pian)。在(zai)光(guang)(guang)學領域中(zhong)紅(hong)(hong)外濾(lv)(lv)光(guang)(guang)片(pian)一(yi)般是由光(guang)(guang)學玻璃(li)鍍膜、光(guang)(guang)學塑料(liao)(liao)（如PC及(ji)PMAA）或光(guang)(guang)學璃(li)片(pian)再加入(ru)特種染(ran)料(liao)(liao)做成的(de)有(you)色玻璃(li)濾(lv)(lv)光(guang)(guang)片(pian)，上述工(gong)藝的(de)濾(lv)(lv)光(guang)(guang)片(pian)只(zhi)能讓紅(hong)(hong)光(guang)(guang)通過，宏(hong)觀上講都是紅(hong)(hong)外濾(lv)(lv)光(guang)(guang)片(pian)。

紅(hong)(hong)(hong)外(wai)(wai)濾(lv)光(guang)片(pian)主要應用于安防監控領域，紅(hong)(hong)(hong)外(wai)(wai)氣體(ti)分(fen)析儀，夜視(shi)產(chan)品(pin)，紅(hong)(hong)(hong)外(wai)(wai)探測器(qi)，紅(hong)(hong)(hong)外(wai)(wai)接收機，紅(hong)(hong)(hong)外(wai)(wai)感應，紅(hong)(hong)(hong)外(wai)(wai)通訊產(chan)品(pin)。具體(ti)到產(chan)品(pin)比如：監控攝相機，遙控器(qi)，紅(hong)(hong)(hong)外(wai)(wai)幕墻產(chan)品(pin)，紅(hong)(hong)(hong)外(wai)(wai)感應馬桶、水龍頭(tou)、洗(xi)手(shou)液(ye)裝置，紅(hong)(hong)(hong)外(wai)(wai)測溫器(qi)，紅(hong)(hong)(hong)外(wai)(wai)打(da)印(yin)機，交(jiao)互(hu)式電(dian)子白板，紅(hong)(hong)(hong)外(wai)(wai)觸摸屏，指紋識別(bie)機，人臉識別(bie)系統(tong)等。

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二、紅外濾光片的分類

從材(cai)料上劃分，有(you)光(guang)學玻(bo)璃(li)鍍(du)膜的(de)，也有(you)有(you)色玻(bo)璃(li)制成的(de)，也有(you)塑料紅外濾光(guang)片。這里所指的(de)是近(jin)紅外濾光(guang)片。如果涉及(ji)到中遠紅外，材(cai)料還有(you)Si，ZnSe，Sapphire，CaF2，石英(ying)玻(bo)璃(li)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(bo)通型，包(bao)括以下幾種：

1、有色玻璃制(zhi)作而(er)成，通常(chang)為黑色，比如IPG-800。它將(jiang)可(ke)見(jian)光吸收，允許透(tou)過紅(hong)外(wai)光。如果透(tou)過此紅(hong)外(wai)濾光片(pian)去看(kan)太(tai)陽，依然可(ke)以看(kan)見(jian)一個紅(hong)紅(hong)的太(tai)陽。適(shi)合用(yong)于紅(hong)外(wai)呈像。

2、在光(guang)(guang)學白玻璃上通過(guo)(guo)真空鍍(du)膜制成紅外(wai)(wai)(wai)濾(lv)光(guang)(guang)片，比(bi)如IPGC-720，這種類(lei)型(xing)的(de)又叫光(guang)(guang)學冷鏡(jing)，它將可見光(guang)(guang)反(fan)射，讓(rang)紅外(wai)(wai)(wai)光(guang)(guang)透過(guo)(guo)。外(wai)(wai)(wai)觀看(kan)起(qi)來是(shi)銀色的(de)，像是(shi)一面鏡(jing)子(zi)。如果是(shi)中(zhong)遠(yuan)紅外(wai)(wai)(wai)的(de)濾(lv)光(guang)(guang)片，要(yao)在Si，Sapphire，石英玻璃上鍍(du)膜。

3、由特種(zhong)塑料(liao)制成的(de)(de)紅(hong)外塑料(liao)濾光(guang)片，外觀黑(hei)色(se)，如果透過此紅(hong)外濾光(guang)片去看(kan)太(tai)陽(yang)(yang)，也可以(yi)看(kan)見一個紅(hong)紅(hong)的(de)(de)太(tai)陽(yang)(yang)。這(zhe)種(zhong)塑料(liao)的(de)(de)材料(liao)可以(yi)是(shi)(shi)PC也可以(yi)是(shi)(shi)PMMA。

再說帶通型，帶通濾光片都是(shi)(shi)由真空(kong)鍍膜而成(cheng)。對于近(jin)紅(hong)外(wai)(wai)的(de)帶通來說，是(shi)(shi)在(zai)白玻璃上鍍膜。如果是(shi)(shi)中遠紅(hong)外(wai)(wai)，則(ze)會在(zai)Sapphire上鍍膜。其中近(jin)紅(hong)外(wai)(wai)的(de)帶通濾(lv)光(guang)(guang)片(pian)相(xiang)(xiang)應的(de)光(guang)(guang)源(yuan)主(zhu)要是(shi)(shi)紅(hong)外(wai)(wai)IR LED和紅(hong)外(wai)(wai)激光(guang)(guang)，所以主(zhu)要波長有808nm，850nm，905nm，940nm，1064nm，也有不(bu)常用(yong)的(de)780nm。所以常用(yong)的(de)近(jin)紅(hong)外(wai)(wai)濾(lv)光(guang)(guang)片(pian)的(de)波長主(zhu)要就是(shi)(shi)這些。相(xiang)(xiang)應的(de)型號有BPF-850，NBF-808，BPF-940。