一、紅外濾光片是什么

紅外濾光片是一(yi)種可以屏蔽紫外(wai)光(guang)、可見光(guang)，僅透紅外(wai)光(guang)的光(guang)學(xue)(xue)濾光(guang)片(pian)(pian)。在光(guang)學(xue)(xue)領域中紅外(wai)濾光(guang)片(pian)(pian)一(yi)般是由光(guang)學(xue)(xue)玻(bo)(bo)璃鍍膜、光(guang)學(xue)(xue)塑料(liao)（如PC及PMAA）或光(guang)學(xue)(xue)璃片(pian)(pian)再加入特(te)種染料(liao)做成的有(you)色玻(bo)(bo)璃濾光(guang)片(pian)(pian)，上述(shu)工(gong)藝的濾光(guang)片(pian)(pian)只能(neng)讓紅光(guang)通過，宏觀上講都(dou)是紅外(wai)濾光(guang)片(pian)(pian)。

紅(hong)(hong)(hong)(hong)(hong)外(wai)濾光(guang)片主要應用于安防監控領域，紅(hong)(hong)(hong)(hong)(hong)外(wai)氣(qi)體分析儀，夜視產(chan)品，紅(hong)(hong)(hong)(hong)(hong)外(wai)探測(ce)器(qi)，紅(hong)(hong)(hong)(hong)(hong)外(wai)接收機(ji)，紅(hong)(hong)(hong)(hong)(hong)外(wai)感(gan)應，紅(hong)(hong)(hong)(hong)(hong)外(wai)通訊產(chan)品。具體到(dao)產(chan)品比如(ru)：監控攝相(xiang)機(ji)，遙控器(qi)，紅(hong)(hong)(hong)(hong)(hong)外(wai)幕墻(qiang)產(chan)品，紅(hong)(hong)(hong)(hong)(hong)外(wai)感(gan)應馬桶(tong)、水龍頭、洗手液裝置，紅(hong)(hong)(hong)(hong)(hong)外(wai)測(ce)溫器(qi)，紅(hong)(hong)(hong)(hong)(hong)外(wai)打印機(ji)，交互式電(dian)子(zi)白板(ban)，紅(hong)(hong)(hong)(hong)(hong)外(wai)觸摸屏，指紋識別機(ji)，人臉識別系統(tong)等。

該圖片由注冊用戶"天空之城"提供，版權聲明反饋

二、紅外濾光片的分類

從材料上劃分，有(you)光學玻(bo)(bo)璃(li)(li)鍍(du)膜的，也(ye)有(you)有(you)色(se)玻(bo)(bo)璃(li)(li)制成(cheng)的，也(ye)有(you)塑料紅外(wai)(wai)濾(lv)光片。這里所指的是近紅外(wai)(wai)濾(lv)光片。如(ru)果涉及到中遠(yuan)紅外(wai)(wai)，材料還有(you)Si，ZnSe，Sapphire，CaF2，石英玻(bo)(bo)璃(li)(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(tong)型，包(bao)括以下幾種：

1、有(you)色玻璃制作(zuo)而成，通常為(wei)黑色，比如IPG-800。它將可見(jian)光吸收，允許透(tou)過紅(hong)(hong)外(wai)光。如果透(tou)過此紅(hong)(hong)外(wai)濾光片去看太陽(yang)，依然(ran)可以(yi)看見(jian)一個紅(hong)(hong)紅(hong)(hong)的太陽(yang)。適合用于紅(hong)(hong)外(wai)呈像(xiang)。

2、在(zai)光(guang)(guang)(guang)(guang)學(xue)白玻璃(li)(li)上通過真空鍍(du)膜制成紅(hong)外濾光(guang)(guang)(guang)(guang)片(pian)，比如(ru)IPGC-720，這(zhe)種(zhong)類(lei)型的又(you)叫光(guang)(guang)(guang)(guang)學(xue)冷鏡，它將(jiang)可見光(guang)(guang)(guang)(guang)反射，讓紅(hong)外光(guang)(guang)(guang)(guang)透過。外觀(guan)看起(qi)來是銀色的，像是一(yi)面(mian)鏡子。如(ru)果是中遠紅(hong)外的濾光(guang)(guang)(guang)(guang)片(pian)，要(yao)在(zai)Si，Sapphire，石(shi)英玻璃(li)(li)上鍍(du)膜。

3、由特種塑料制(zhi)成的(de)紅(hong)外塑料濾光片(pian)，外觀黑色(se)，如果(guo)透過此紅(hong)外濾光片(pian)去看(kan)太(tai)陽，也可以看(kan)見一個紅(hong)紅(hong)的(de)太(tai)陽。這種塑料的(de)材料可以是(shi)PC也可以是(shi)PMMA。

再說帶通型，帶通濾光片都(dou)是(shi)由真空鍍膜而成。對于近紅(hong)(hong)外(wai)(wai)的帶通(tong)(tong)來說，是(shi)在白玻(bo)璃上(shang)鍍膜。如果是(shi)中(zhong)遠紅(hong)(hong)外(wai)(wai)，則會在Sapphire上(shang)鍍膜。其(qi)中(zhong)近紅(hong)(hong)外(wai)(wai)的帶通(tong)(tong)濾光(guang)(guang)(guang)片相應的光(guang)(guang)(guang)源主要(yao)(yao)是(shi)紅(hong)(hong)外(wai)(wai)IR LED和紅(hong)(hong)外(wai)(wai)激(ji)光(guang)(guang)(guang)，所以主要(yao)(yao)波長(chang)有(you)808nm，850nm，905nm，940nm，1064nm，也有(you)不(bu)常用(yong)的780nm。所以常用(yong)的近紅(hong)(hong)外(wai)(wai)濾光(guang)(guang)(guang)片的波長(chang)主要(yao)(yao)就是(shi)這(zhe)些。相應的型號有(you)BPF-850，NBF-808，BPF-940。