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湿敏元件不只是单独用来检测湿度,而且也是湿度精密控制系统的重要组成部分。对研制湿敏元件的主要要求是:(1)检测范围宽,要求能检测相对湿度范围为0～100％;(2)耐高温,在150℃下也能使用;(3)高精度,要求在相对湿度0～20％的低温区有较高的检测精度。最近的发展趋势,多从提高稳定性和延长使用寿命的角度考虑而较多采用陶瓷类材料,其中,电阻式湿敏元件占绝大多数。本文介绍的新型湿敏元件也是属于电阻式一类的。它是以磷酸盐玻璃为基本原料,由磷酸盐玻璃粉和具有特种晶体组织的钛酸钾纤维构成的一种湿敏复合烧结元件。
Humidity sensors are not only used to detect humidity alone, but they are also an important part of a precision control system for humidity. The main requirements of the development of moisture-sensitive components are: (1) wide detection range, required to test the relative humidity range of 0 to 100%; (2) high temperature, can also be used at 150 ℃; (3) In the relative humidity 0 ~ 20% of the low temperature zone has a higher detection accuracy. Recent trends, more from the perspective of improving the stability and extend the life of more use of ceramic materials, of which, resistive humidity-sensitive components accounted for the vast majority. This article describes the new type of humidity sensor is also a kind of resistance. It is based on phosphate glass as the basic raw material, composed of phosphate glass powder and potassium titanate fiber with a special crystal structure of a moisture-sensitive composite sintering components.