Process instrumentation for impedance spectroscopy - a modular concept

Although the advantages of using the electrical impedance for characterization of biological material such as cell suspensions or tissue, only few commercial devices for process measurements are available today. Here we present a modular concept for broad bandwidth measurements especially designed for integration in industrial plants. It utilizes multi-sinus-technique from 10 Hz - 10 MHz and a maximum length correlation for the high frequency range up to 5 GHz. The low and high frequency modules as well as the analogue front ends can be combined for optimal performance. The performance of these instruments is comparable to that of commercial network analyzers. Connected to a PC they are also a versatile and affordable laboratory instrument.