Good Impedances

The gages used were Al foil strips because Al provides a good impedance match to detonation... 

Equipment dedicated to simultaneous FT analysis at a constant potential or during ac sweep is still less common. More details on how to choose the ac amplitude and to assure that good impedances will be obtained will be discussed in Sect. 13.2. 

Ferroelectric composites can be used as underwater transducers [22] to detect (passive mode) and/or generate (active mode) sound. Transducers made from ceramics have the disadvantage that their density makes it difficult to obtain good impedance matching with water. One of the problems with PVDF (aside from the problems associated with poling) is its low permittivity. This will produce a low element capacitance, which will load the output. The equivalent circuit for a flank array transducer linked to an amplifier via a cable is shown in Fig. 6.15. The open-circuit voltage sensitivity Moc/ is loaded by stray capacitance Cg, and/or cable capacitance Q. The end-of-cable sensitivity Mgc is given by... 

Figures 18.9 and 18.10 present simulated and measured reflection coefficients of the microfluidic soft PICA in various states. The relaxed antenna achieves good impedance match (Sjj < -10 dB), within 3-11 GHz, both in simulations and experiments.

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