Frequency response analysis of piezoelectric resonance of poly-lactic acid film for bending angle detection

Abstract

Abstract The relationship between the output voltage from a poly-lactic acid piezoelectric film sensor and the bending angle of it can be derived by analyzing the resonance frequency of the sensor changes with the bending angle using the finite element method. The proposed sensor was excited and its oscillation was observed using the piezoelectricity of poly-lactic acid. The output voltage was amplified by resonating a brass plate with a slit. The frequency changes significantly with bending because the change in frequency of resonance of the metal substrate with high mechanical Q was measured. The resonance frequency increased linearly when the bending angle ranged from 0° to 5°. It was also confirmed that the correspondence between the frequency and the bending angle is uniquely determined because there was only one peak of the output voltage amplitude for inputs of multiple frequencies.