Abstract
The thermal modulation transfer function for a pyroelectric imaging system, such as the pyroelectric vidicon, is calculated for the case where the incident radiation is subjected to rectangular time modulation, as produced for example by the usual mechanical chopper. This modulation transfer function is compared with that previously calculated for the case of sinusoidal time modulation. In the latter case it is shown that there is a phase shift in time, between the sinusoidal radiation input and the pyroelectric charge developed, which is different for each Fourier component of the image. With the rectangular time modulation this phase shift problem does not arise. Furthermore, for a given radiation level, rectangular modulation gives a larger available signal charge.
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