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class="newstit">二氧化碳傳感器的原理</h1> <div id="3xqk0v4" class="newstime"> <span id="s8wgzle" class="skim"><em>瀏覽次數(shù)：</em>2801</span><span id="ok5vlwp" class="skimtim"><em>發(fā)布日期：</em>2012-05-04 </span> </div> 　　二氧化碳傳感器的原理<br />　　<br />　　測(cè)量氣體濃度的理論和技術(shù)不斷出現(xiàn)，其中包括化學(xué)傳感器、陶瓷傳感器及各種類型的電化學(xué)傳感器．以及測(cè)量濕度的濕度傳感器，二氧化碳變送器等等。每種傳感器適用于一定的應(yīng)用領(lǐng)域，但需要經(jīng)常校準(zhǔn)，并只能在清潔的環(huán)境中工作．傳統(tǒng)的CO2傳感器對(duì)于像CO2這樣的不可燃?xì)怏w的測(cè)量尤其困難，化學(xué)傳感器很難勝任這項(xiàng)工作，使用壽命也很短。其他的各種間接測(cè)量方法，由于它們通常不僅僅對(duì)一種氣體組成度敏感．所以其精度很低且漂移量較大．與化學(xué)二氧化碳傳感器相比，光學(xué)測(cè)量?jī)x器有許多優(yōu)點(diǎn)，但其昂貴的價(jià)格也確時(shí)降低了它的市場(chǎng)競(jìng)爭(zhēng)力。不過(guò)，隨著產(chǎn)品集成化程度的提高，其生產(chǎn)成本也正在降低這種CO2傳感器的工作原理是：采用了單束雙波長(zhǎng)非發(fā)散性紅外線洲量方法，其*之處在于它的濾光鏡——1種袖珍電子調(diào)諧干擾儀。這種濾光銑保證了它所透過(guò)的光波波長(zhǎng)的性和穩(wěn)定性，避免了由于濾光鏡廈探剎器不匹配而發(fā)生的問(wèn)題及傳統(tǒng)的旋轉(zhuǎn)式濾光鏡所產(chǎn)生的磨損．本文所要討論的是光學(xué)測(cè)量方法中的一種即非發(fā)散性紅外線測(cè)量．<br />　　<br />　　1非發(fā)散性紅外線氣體探測(cè)辦法討論各種氣體都會(huì)吸收光。不同的氣體吸收不同波長(zhǎng)的光，比如CO2就對(duì)紅外線（波長(zhǎng)為4.26m）敏感。光學(xué)氣體檢測(cè)通常是把被測(cè)氣體吸入一個(gè)測(cè)量室，測(cè)量室的一端安裝有光源而另一端裝有濾光鏡和探測(cè)器．濾光鏡的作用是只容許某一特定波長(zhǎng)的光線通過(guò)．探測(cè)器則測(cè)量通過(guò)測(cè)量室的光通量．探測(cè)器所接收到的光通量取決于環(huán)境中被測(cè)氣體的濃度．基于非發(fā)散性紅外線氣體檢測(cè)原理的測(cè)量方法主要有3種：?jiǎn)喂馐鴨尾ㄩL(zhǎng)測(cè)量、雙光束雙波長(zhǎng)測(cè)量和單光束雙波長(zhǎng)測(cè)量．<br />　　<br />　　單光束單波長(zhǎng)測(cè)，顧名思義，這種CO2傳感器測(cè)量?jī)x器只能提供單一波長(zhǎng)的光線．在上述3種測(cè)量方法中它的性能差，其穩(wěn)定性極易受到諸如燈泡老化、灰塵污染及光線發(fā)射特性變化等因素的影響．目前在市場(chǎng)上銷售的許多種單束單波，長(zhǎng)測(cè)量?jī)x器的穩(wěn)定性都不很理想此外，溫度的變化也會(huì)影響其穩(wěn)定性．但這種儀器的優(yōu)點(diǎn)是構(gòu)造簡(jiǎn)單機(jī)械性能可靠且價(jià)格低廉．<br />　　<br />　　雙光束雙波長(zhǎng)測(cè)，這種測(cè)量其儀器備有2個(gè)光渡通道，1個(gè)探測(cè)器及2個(gè)濾光鏡，與前一種儀器比較，其精度和穩(wěn)定性都有所提高，但相應(yīng)的它的價(jià)格也較高．此外為r提高其工作溫度范圍，2個(gè)探測(cè)器必須*匹配．在實(shí)際應(yīng)用中，2個(gè)光波通道受到的灰塵污染程度同樣也會(huì)給這類測(cè)量?jī)x器帶來(lái)因非對(duì)稱污染而精度失準(zhǔn)的問(wèn)題． <div class="8wya9sn" id="news_sx"><li id="jfazjvo" 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