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本文比较了TGS、LiTaO_3、硼酸盐和其他热释电探测器的琼逊噪声与背景噪声的大小,可以看到,在角频率为探测灵敏元的热时间常数的倒数时,琼逊噪声出现最小值,对有些材料,该最小值可能比背景噪声小得多。本文还讨论了利用这一特性来制作实际探测器的有关问题。需要一种与优良的低噪声放大器配合,具有最小热容的元件,但是由于采用制作电子材料的现代技术有可能制备出比现在一般使用的要好得多的电子器件,因而元件在低频下的性能接近于背景限。
This article compares the Johnson and background noise of TGS, LiTaO_3, borates, and other pyroelectric detectors. It can be seen that Johnson’s noise appears when the angular frequency is the reciprocal of the thermal time constant for the sensing element The minimum value, for some materials, may be much smaller than the background noise. This article also discusses the use of this feature to make the actual detector related issues. There is a need for an element with an excellent low noise amplifier that has a minimal heat capacity, but because of the modern technology of making electronic materials it is possible to make much better electronic devices than are commonly used today, the performance of the element at low frequencies Close to the background limit.