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本文讨论了热电探测器的五个主要性能参数:响应率、噪声、噪声等效功率、探测率和时间常数。分析了前四个参数与工作条件(工作频率、探测器面积和前置放大器输入阻抗)的函数关系。阐明了时间常数概念用于热电探测器时新的特点。本文着重指出:在目前场效应晶体管(以下简写称为FET)水平还不高的情况下,热电探测器的性能受限于前置放大器(以下简写称为前放)所用的FET。它的几种主要性能参数都在很大程度上依赖于FET的水平,文中列举数据对此作了说明。因此通常说,比较热电探测器的性能,实际上乃是比较热电探测器/前放组合件的性能;若只比较热电探测器本身的性能,则需要以其前放的水平相同为条件。
This article discusses the five main performance parameters of a pyroelectric detector: response rate, noise, noise equivalent power, detection rate, and time constant. The first four parameters are analyzed as a function of operating conditions (operating frequency, detector area and preamplifier input impedance). Clarified the new characteristics of the time-constant concept for pyroelectric detectors. This article highlights: In the current field-effect transistor (hereinafter referred to as FET) level is not high, the performance of the pyroelectric detector is limited by the preamplifier (hereinafter referred to as the preamplifier) FET. Several of its key performance parameters are heavily dependent on the level of the FET, as enumerated in the article. Therefore, in general, comparing the performance of a pyroelectric detector is actually comparing the performance of the pyroelectric detector / preamplifier assembly; if only the performance of the pyroelectric detector itself is compared, then it is necessary to make the same level of its predecessor.