The property of air sensitive of SnO2/Pt film that gas adsorption effect will cause the velocity corresponding change of surface acoustic wave on the film surface.Combined with laser ultrasound detection technology

a new kind of gas sensor detection methods is put forward.By using the laser cladding selective adsorption film on the surface of polishing aluminum

to inspire acoustic surface wave and by using single fiber coupling beams of reflective deflection method

the stimulated surface acoustic wave information is acquired.By using reasonable algorithm.the gas volume fraction in the environment can be accurately detected.It provides a new way for gas monitoring method.