A piezoelectric array for sensing radiation modes

With an example of simply supported beam, this paper presents new experimental wok that is to sense radiation modes by a piezoelectric array. An array of rectangular segments of PVDF film attached on the surface of the beam are taken as sensor. The output signals of the PVDF films are multiplied by appropriate weights so that the weighted combinations of the outputs directly lead to the radiation mode amplitudes of the beam. The weight of every PVDF film sensor is independent of the type, magnitude and position of the external excitation. Experimental results are also presented to show the feasibility of this new type radiation mode sensor.