A novel structure of surface acoustic wave humidity sensor is prensented.A new structure is presented based on revised SAW resonator.ITO is used as electrode material
Si3N4 is used as protective layer sputtered on IDT and reflectors
and pilymide is used as sensitive material spin coated between IDT and reflector.Relationship between relative humidity and frequency shift of oscillator is given.The experiments show that the novel structure is effective for measuring humidity.
Measurements results of SAW humidity sensor with nafion layer [J] . A. Kawalec,K. Jasek,M. Pasternak. The European Physical Journal Special Topics . 2008 (1)