What is it about?
The staircase waveform has been used to realize higher precise AC voltage based on programmable Josephson voltage standard. In this case the values of step of the staircase waveform are traced to DC Josephson voltage. Finally the AC voltage obtains a quantum level accuracy higher than traditional methods such as thermo-electrical conversion. In this process, we have a lot of knowledge about the Josephson voltage standard and sinusoidal waveform. However the staircase waveform should be more researched.
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Why is it important?
In the fact this staircase waveform could also be used in dynamic measurement received extensive attention in recent years. As we known, the dynamic state’s reference (or its traceability) is still a difficult problem. However the staircase waveform gives a chance. When each step value is given into capacitance (or resistance) which is output of a sensor, in static condition, the entire staircase waveform will provide a model of dynamic state. Some benefit such as higher accuracy would be expected.
Perspectives
Yes, there are many investigations to do in this subject. In any case, the staircase waveform is worth our attention. The Author (luzl@nim.ac.cn) and his colleagues work in the subject to develop measurement technique, their series of papers have been published and will be written focused on the staircase waveform included its property, measurement and application. The paper titled as “Discussion on new properties of staircase waveform through connection to an infinite series” is one of them. The property is a basis of the measurement and application. As measurement technique, the investigations can also be used in other places such as island, desert, deep space, deep sea, and so on, due to the chips of ADC and DAC are proposed in the technique, they are with light weight, small volume, and less power consumption.
Dr Zuliang Lu
National Institute of Mdetrology
Read the Original
This page is a summary of: Discussion on new properties of staircase waveform through connection to an infinite series, IET Science Measurement & Technology, January 2015, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-smt.2013.0104.
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