EFFECTS OF THE MEASURING CIRCUIT ON BROAD-BAND PIEZO AND PYROELECTRICMEASUREMENTS

Broadband dielectric measurements often are made under conditions appr oximating open or short circuit conditions by choosing the source and amplifier impedances such that the input time constant is either very short or very long compared to the time scales (frequency bandwidth) o f the events measured. The time-domain equations expressing the relati onship between the ideally desired open circuit voltage (or short circ uit current) and the actually measured voltage (or current) are examin ed for a simple model circuit and are generalized for circuits with an arbitrary number of loops. A general data treatment procedure for cal culating the desired responses (open circuit voltage or short circuit currents) is suggested and is illustrated in a simple case. Time-domai n calibration methods are discussed also.