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首页> 外文期刊>Instrumentation and Measurement, IEEE Transactions on >A Compensation Method With a Standard Square Wave for Precise DC Measurement of Mutual Inductance for Joule Balance
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A Compensation Method With a Standard Square Wave for Precise DC Measurement of Mutual Inductance for Joule Balance

机译:一种标准方波的补偿方法,用于精确测量焦耳平衡的互感直流

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摘要

The precise dc-based measurement of the mutual inductance is one of the key issues in the Joule Balance method used to determine Planck's constant $h$. Here, a new compensation method with a standard square wave is provided. The dc value of the mutual inductance is obtained by measuring the integral area of the induced voltage. To increase the accuracy of this integral method, we just accurately measure the residual area observed between the induced voltage of the mutual inductor and a synchronously generated standard square wave. Experimental results indicate that this approach is consistent with the previous frequency extrapolation method within 1 ppm. The measurement uncertainty is estimated to be about 0.22 $muhbox{H/H}$ for the 340-mH mutual inductor at room temperature. A better result of 0.1 ppm could be obtained when the superconducting coil is used.
机译:基于直流的精确互感测量是用于确定普朗克常数$ h $的焦耳平衡法中的关键问题之一。这里,提供了一种具有标准方波的新补偿方法。互感的dc值是通过测量感应电压的积分面积获得的。为了提高这种积分方法的精度,我们只需要精确测量互感器感应电压与同步生成的标准方波之间观察到的剩余面积即可。实验结果表明,该方法与以前的频率外推法在1 ppm之内一致。对于340 mH互感器,在室温下,测量不确定度估计约为0.22μh·h {H / H} $。当使用超导线圈时,可以获得0.1 ppm的更好结果。

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