Generating broadband test signals with resonant piezoelectrictransducers

Abstract

A new method is proposed for generating broadband (BB) test signalsfor use in impulse response (IR) system identification applications. Thismethod uses resonant reciprocal transducers with low losses along withsuitable excitation in order to increase the effective bandwidth of thetransducer. The approach is general and can be extended to any resonant lowpass or band pass linear structure with an autoregressive transient response.The new approach is justified in a brief review of the shortcomings of impulseresponse measurements and deconvolution in real/imperfect physical systems.The resulting mean square error (MSE) of a system's impulse response obtainedis related to the performance of the optimized Wiener filter and noiseconditions. The idealized description is followed by an experimentalevaluation of small size resonant piezoelectric actuators in air, using thebandwidth broadening excitation.