超低频电压量值溯源关键技术研究  

Research on Key Technologies of Ultra-Low Frequency Voltage Traceability

作　　者：石照民 张江涛[1] 潘仙林[1] 宋莹[1] SHI Zhaomin;ZHANG Jiangtao;PAN Xianlin;SONG Ying(National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2021年第5期30-35,共6页Metrology Science and Technology

基　　金：国家重点研发计划资助项目(2016YFF0201204)。

摘　　要：针对热电变换器无法实现超低频电压交直流转换的问题,基于热电变换器输出热电势的平方特性和等幅值正交正弦信号平方和恒等特性,结合双加热丝热电变换器,提出一种超低频电压交直流转换方法,将超低频电压溯源至直流电压基准,实现10 Hz及以下超低频电压的量值溯源。搭建超低频电压交直流转换系统,在10 Hz频率下交直流转换的标准不确定度不超过14μV/V。设计验证实验,与平面多元热电变换器交直流转换结果进行对比,两种方法得到的结果具有较好的一致性,其不一致性在不确定度范围内。To address the problem that the thermal voltage converter(TVC)is unable to achieve the AC-DC conversion of ultra-low frequency voltages,an AC-DC transfer method is proposed with using dual-heater TVC based on the square characteristics of the output thermoelectric potential of the TVC and the square sum identity characteristics of two quadrature sinusoidal signals with identical amplitude.The ultra-low frequency voltage below 10 Hz is traced to the DC voltage standard.The ultra-low frequency voltage AC-DC transfer system is developed.The standard uncertainty of AC-DC transfer results at 10 Hz does not exceed 14μV/V.A verification experiment is developed by comparing the AC-DC transfer results that from dual-heater TVC and planar multijunction thermal converter(PMJTC).The AC-DC transfer results obtained by the two different methods are consistent and the inconsistency is within the uncertainty range.

关 键 词：超低频电压 交直流转换 量值溯源 双加热丝热电变换器 旁证实验 

分 类 号：TM46[电气工程—电器]