Chirp response of an active-controlled thickness-drive tunable transducer
The chirp response of a thickness-drive tunable transducer for wide range time-bandwidth and sweep rates chirp signals is demonstrated experimentally and computationally. The computational evaluation uses recursive digital-filter model based on the z-transform method. The model is limited to simple lossless structure with no front and backing layers. The model and experimental results show that there is no limit on the maximum sweep rate of the chirp signal but practically the limit is determined by the limitation of the circuit that generates the control voltage that simulates a variable electric load.
Alwi
HA
Department of Physics, Universiti Kebangsaan Malaysia, Bangi, Malaysia.
Carey
JR
Smith
BV