描述
之后隨著光電煙霧探測(cè)技術(shù)的發(fā)展創(chuàng)新,光電煙霧探測(cè)技術(shù)有著逐步取代離子煙霧探測(cè)技術(shù)的趨勢(shì)。其大多采用的散射光原理工作,摒棄了放射源,受風(fēng)流和環(huán)境濕度變化影響小、成本也低,適用于大顆粒的監(jiān)測(cè)。光電型煙霧探測(cè)器里面有一個(gè)光學(xué)迷宮并且安裝了紅外對(duì)射管,當(dāng)無煙時(shí)紅外接收管接收不到紅外發(fā)射管發(fā)出的紅外光,但是如果當(dāng)有煙塵進(jìn)入光學(xué)迷宮時(shí),煙塵通過折射、反射,接收管接收到紅外光,智能報(bào)警電路判斷是否超過閾值,如果超過閾值就會(huì)發(fā)出警報(bào)。對(duì)比之下,似乎光電煙霧傳感器更勝一籌,不過要想最大限度發(fā)揮火災(zāi)預(yù)警作用,這還遠(yuǎn)遠(yuǎn)不夠。如今市場(chǎng)上典型的光學(xué)檢測(cè)器,都是用向前散射幾何,其長(zhǎng)度為5-10CM,LED與光電二極管之間有著近150°的角,導(dǎo)致數(shù)據(jù)收集的路徑過長(zhǎng),再加上用于消除環(huán)境光干擾的模塊,這讓煙霧探測(cè)尺寸過大,并且反應(yīng)時(shí)間長(zhǎng)。
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