半(ban)導(dao)體露點傳感(gan)器:每個水分子(zi)都(dou)有(you)其固有(you)的振(zhen)蕩(dang)頻率(lv)。當它(ta)進入(ru)半(ban)導(dao)體晶格空間時,它(ta)與電荷激(ji)發的晶格共(gong)振(zhen),它(ta)的共(gong)振(zhen)頻率(lv)與水的摩爾數成正比。水分子(zi)的共(gong)振(zhen)可(ke)以(yi)從半(ban)導(dao)體結(jie)釋放自由電子(zi),使晶格的電導(dao)率(lv)增大,阻抗減小。利用該特性方案(an),可(ke)以(yi)用半(ban)導(dao)體露點儀(yi)測定-100c露點的含水率(lv)。
晶體(ti)振蕩(dang)露(lu)點(dian)(dian)傳感(gan)器:通過改變振蕩(dang)頻率后的晶體(ti)振蕩(dang)露(lu)點(dian)(dian)測量特性,設(she)計出晶體(ti)振蕩(dang)露(lu)點(dian)(dian)測量儀。這(zhe)是(shi)一種相對較新的技能,仍處于不(bu)成熟的時期。國外也(ye)有相關商品,但精度較低,成本(ben)較高。
電解露點儀:利用(yong)五氧化二(er)磷(lin)等材料分解成性(xing)分子,將電荷堆(dui)積在(zai)電極上,設(she)計了以一定(ding)含水(shui)量為(wei)單位的電解微水(shui)表。目前精度(du)(du)(du)達(da)到+1度(du)(du)(du)(露點溫度(du)(du)(du)),精度(du)(du)(du)可達(da)到+3攝氏度(du)(du)(du)。
電(dian)(dian)(dian)傳感器露點(dian)(dian)計:用親水(shui)性材料或(huo)疏水(shui)性材料作為(wei)介質(zhi)形成電(dian)(dian)(dian)容器或(huo)電(dian)(dian)(dian)阻。水(shui)流動后,介電(dian)(dian)(dian)常(chang)數(shu)或(huo)電(dian)(dian)(dian)導率隨之變化,可以測(ce)量時間的電(dian)(dian)(dian)容值或(huo)電(dian)(dian)(dian)阻值,此時的氣體(ti)含水(shui)量是已知的。建立在(zai)露點(dian)(dian)單元(yuan)系統上的傳感器構成了電(dian)(dian)(dian)傳感器露點(dian)(dian)分(fen)析儀。精(jing)度現(xian)在(zai)為(wei)+1c(露點(dian)(dian)溫度),精(jing)度通(tong)常(chang)在(zai)+3c范圍內。