2003-(II)-Ultrasonic techniques - The Resonator

Written by Iwanowski. Posted in Projects

Electronic equipment:

Fig.(3.8) shows a block circuit for broad-band resonator measurements.  With the aid of a commercial network analyzer it is possible to measure the transfer function with high accuracy.  In addition, a RF pre-amplifier, matching the high-impedance transducer output to the NWA input has been used.  Furthermore, applying a computer for control of the network analyzer (NWA) and the amplifier and for the data evaluation, enabled automatic measurement routines. As presented in Fig.(3.9), the resonator transfer function can not be described by one Lorentz function. Therefore a fitting procedure of the transfer function is performed with the aid of a function, which allows to fit, beside the principal mode, the satellite mode as well as the electrical cross talk: 

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