本文分析了热释电探测器中的噪声源及其对探测器性能的限制作用。推导了一个修正的约翰森-尼奎斯关系式,使之适合于计算介质损耗噪声。本文得出如下结论:1)小电容响应元热释电探测器中,FET产生的介质损耗噪声是主要的噪声源;2)悬于真空中的自由支撑热释电探测器中有一个使NEP达极小值的最佳工作频率。 This paper analyzes the noise sources in pyroelectric detectors and their limitations on detector performance. A modified Johnson-Nyquist relation is derived that makes it suitable for calculating dielectric loss noise. The conclusions of this paper are as follows: 1) The small dielectric response pyroelectric detector has dielectric loss noise generated by the FET as the main noise source. 2) One of the free-standing pyroelectric detectors suspended in vacuum has NEP The minimum operating frequency of the best.