抄録
Piezoelectric polymer film generates large output voltage only in the dynamic deformation load, because it has the piezoelectricity. Since electric charge in which a film arises in static loading is little, electric charge is released on polymer piezoelectric film through the measuring instrument. Therefore, we cannot measure accurately electric charge using conventional electrometer. Recently, it was developed contact type surface potential meter with the ultra-high input impedance. This paper describes the method to strain measurements and strain analysis with this surface potential meter. We carried out bending test of the beam and tensile test of flat plate with circular hole. As a result of the experiment, the results of strain value were also near both on strain value using the piezo film gage and the resistance wire strain gages.
