LaF3（掺杂CaF2）固体电解质湿度传感器

The research of humidity sensor used solide electrolyte of LaF3

用LaF3（掺杂CaF2）小管作为固体电解质，分别以H2C2O4·2H2O、H2C2O4混合物和Na2SO4·10H2O、Na2SO4混合物作为参比电极，用已知水蒸气分压的纯水和KOH溶液作为工作电极，构成了两类固体电解质水蒸气浓差电池。分别在8～33℃和6～24℃温度范围内研究了电池电动势与温度的关系，得出了有规律性的结果。即电池的电动势随温度的升高而变小，在温度恒定的情况下，随工作电极水蒸气分压的增大而变大，在EMF和lg（PH2O（Ⅰ）PH2O（Ⅱ））之间有较好的线性关系，可望成为一种固体电解质型的新式湿度传感器。

The humidity sensors based on steam concentration cell were constituted by using small seramic tube of LaF3 doped with CaF2 as solide electrolyte, mixed H2C2O4-H2C2O4-2H2O or Na2SO4-Na2SO4-10H2O as refence electrode,and pure water or KOH solution as working electrode. Sensitive experiment of two kind humidity sensor was investigated in the temperature ranges of 8～33 and 6～24℃. The regular change was revealed between EMF and lg（PH2O（Ⅰ）PH2O（Ⅱ））-- EMF will become small along with temperature rise and EMF will become large along with work electrode PH2O（Ⅰ） rise at constant temperature, there is a good liner relationship between EMF and lg PH2O（Ⅰ）/PH2O（Ⅱ） and it is a possible to become a new humidity sensor.