140CPU65160
140CPU65160
這兩束紅外線中的一路通過測量室4進(jìn)入檢測室6,另一路通過參比室5進(jìn)入檢測室6,參比室中密封的是不吸收紅外線的氣體,它的作用是保證兩束紅外線的光學(xué)長度相等,即幾何長度加上通過的窗口數(shù)要相等,因此通過參比室的紅外線,光強(qiáng)和波長范圍基本上不變,而另一束紅外線通過測量室時(shí),因測量室中的待測氣體按照其波長吸收特征吸收相應(yīng)的紅外光線,其光強(qiáng)減弱,所以進(jìn)入檢測室的紅外線就被選擇性的吸收,待測組分氣體吸收紅外線能量后,氣體分子的熱運(yùn)動(dòng)加強(qiáng),產(chǎn)生熱膨脹形成壓力的變化,由于進(jìn)入檢測室兩側(cè)紅外線能量不同,兩側(cè)氣室中的待測組分吸收紅外線能量也不同,因此左右兩側(cè)氣室內(nèi)氣體的溫度變化也不同,壓力變化也就不同,必然是左側(cè)氣室內(nèi)的氣體的壓力大于右側(cè)氣室內(nèi)氣體的壓力,此壓力差推動(dòng)薄膜7產(chǎn)生位移(圖8‐7中薄膜是鼓向右側(cè)),從而改變了薄膜7與另一定片8之間的距離,因薄膜與定片組成一個(gè)電容器,它們之間距離的變化改變了電容器的電容量,因此電容的大小與樣品中待測組分的含量有關(guān)。
◆ 企業(yè)名稱:廈門泰尼電氣有限公司
◆ 主營業(yè)務(wù):DCS,PLC
◆ 經(jīng)營模式: 貿(mào)易
◆ 貿(mào)易地區(qū): 全國
◆ : 小黃《女士》
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