Absolute response and noise equivalent power of cyclotron resonanceassisted InSb detectors at submillimeter wavelengths An equivalent circuit appropriate for pyroelectric materials is derived without assuming a unidirectional pobi.rization vector. This circuit is used to obtain a theoretical expression for the noise equivalent power (NEP) for detectors using pyroelectric sensing elements. It is found that a good figure of merit for pyroelectric materials is given by F p= p/[Cpp(,/ tan6)lJ. It is shown that the resulting expression for NEP is consistent with experimental results as measured in this laboratory.T HE use of the pyroelectric effect in detecting electromagnetic radiation l -S and in the measurement of heat transfer9-12 is of increasing popUlarity. For this reason, ids timely to publish a careful theoretical treatment of pyroelectric sensors which leads to an equivalent circuit and to equations giving the noise equivalent power (NEP) and specific detectivity (D*) which have proved quite fruitful in this laboratory.

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