噪声传递中失配误差的再讨论及解决方案

针对我国实验室噪声传递不确定度较大的问题,以中频衰减法为例,给出噪声传递中失配误差的数学模型。基于无相位信息的复变量不确定度估计的研究成果,给出了失配引入不确定度的最佳估算方法。基于失配不确定度的准确估计,论证了隔离衰减器在噪声测量中的效用及使用策略。最后给出噪声测量中失配误差的最佳解决方案。

Re-discussion and SoIution for Mismatch in Noise Quantity Transfer

Illustrated by the case of Medium Frequency Attenuation noise measurement,a mismatch model is proposed to solve the problem of larger uncertainty of noise transfer of domestic laboratories. Based on the research of measurement uncertainty for complex quantities with unknown phase,an optimal estimation of mismatch uncertainty is described. With the more accuracy estimation of mismatch uncertainty,the effectiveness and the use strategy of the isolation attenuator are discussed. The best solution of mismatch in noise measurement is proposed at last.