## Abstract

The pyroelectric voltage response to rectangular signals of infrared radiation is derived using our recent analysis of the response to a step signal. The response is symmetrical with respect to the electronic and thermal time constants, τ_{e} and τ_{T} of the samples, and with respect to the times T_{1} and T_{2} of irradiation and darkening. When τ_{e} differs appreciably from τ_{T}, the rise of the response at the onset of irradiation and its fall at the beginning of darkening are exponentials with the same time constant, which is the smaller one from among τ_{e} and τ_{T}. A rectangular response is obtained when τ_{e} ≪ (T_{1}, T_{2}) ≪ τ_{T}. In this case the peak-to-peak value V_{ptp} of the response is proportional to τ_{e} and independent of the pulse frequency, as well as of the ratio T_{1}/T _{2}. When T_{1} and T_{2} are each less than the smaller one from among τ_{e} and τ_{T}, triangular responses are obtained, for which V_{ptp} is independent of τ_{e} and inversely proportional to the pulse frequency. Pyroelectric responses obtained in triglycine sulphate and strontium-barium niobate samples of different τ_{T} were found to follow the derived expression, and plots of the measured parameters of the response vs τ_{e}, T_{1}/T_{2}, and pulse frequency show good agreement with the analysis.

Original language | English |
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Pages (from-to) | 1440-1444 |

Number of pages | 5 |

Journal | Journal of Applied Physics |

Volume | 43 |

Issue number | 4 |

DOIs | |

State | Published - 1972 |

Externally published | Yes |