Digital demodulator for electrical impedance imaging

Possible applications of a real-time electrical impedance tomography system are discussed, and ways are considered in which the required signal-to-noise (SNR) ratio can be attained. It is shown that a digital demodulator based on matched filter theory provides an SNR improvement equal to that of its analog counterpart. In addition, the digital filter is more versatile than its analog equivalent. For example, the measurement time can be varied in software, to allow for different frame rates. Experimental results show that the filter operates as expected