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Wearable devices are worn directly on man and one of the most important attribute for wearable devices is “user experience” friendly[1]. Wearable device is small in size, it is difficult to carry large capacity battery. the short duration of the battery and charging difficulties and other issues has become a universal response of all users, which seriously affect the user experience. Wireless energy...
The precise measurement of Planck Constant h to establish a kind of quantum mass standard is an important but very difficult work. The Joule Balance method, for the same purpose but different from Watt Balance method, is going on in NIM for three years. The principle and progress are described.
Traditionally, the most precise way to get the mutual inductance value is by a calculable mutual inductor. Here a new approach of measuring the mutual inductance at low frequency with compensation method is described. The mutual inductance is traced to the value of the frequency and resistance directly. The measurement uncertainty is 0.1 ppm and could be improved further.
This paper gives a high precision capacitive displacement sensor design which is applied in the Joule Balance proposed by NIM, China. The plate of sensor is made by non-magnetic material, and is for the Joule Balance special use. The distance of the capacitive displacement sensor reaches to 1mm. And the resolution is less than 0.019μm full scale, in part range of the full scale, this data will be...
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