湿度—气体传感器和温度—湿度传感器是根据烹调、空气调节器等自动控制系统的迫切需要而研制的。湿度—气体传感器既能测湿度又能检测酒精、烟气等特殊的还原剂,而且具有很高的灵敏度和选择性。这种新型传感器是由多孔结构和p-型半导体性能的MgCr_2O_4—TiO_2陶瓷材料制成的。温度低于150℃时,利用陶瓷粒度表面水蒸气的物理吸附原理;温度在400～500℃时,利用气体的化学吸附原理。 温度—湿度传感器是由多孔介质陶瓷材料Ba_(0.5)Sr_(0.5)TiO_3制成的,其特点是介电常数随高温而变化,这种传感器能够同时和快速检测温度和湿度。这两种传感器加上热处理,具有长期的工作稳定性。 Humidity - gas sensors and temperature - humidity sensor is based on the cooking, air conditioners and other automatic control system, the urgent need to develop. Humidity - gas sensor can measure humidity and alcohol, flue gas and other special reducing agent, but also has high sensitivity and selectivity. The new sensor is made of a porous structure and p-type semiconductor properties of MgCr_2O_4-TiO_2 ceramic material. When the temperature is lower than 150 ℃, the principle of physical adsorption of the water vapor on the surface of the ceramic particle is utilized; at the temperature of 400-500 ℃, the principle of chemical adsorption of the gas is utilized. The temperature-humidity sensor is made of porous ceramic material Ba 0.5 Sr 0.5 TiO 3, which is characterized by the change of dielectric constant with high temperature. The sensor can detect temperature and humidity simultaneously and rapidly. Both sensors plus heat treatment, with long-term work stability.