Journal
MICROSYSTEMS & NANOENGINEERING
Volume 8, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s41378-022-00375-1
Keywords
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Funding
- National Key Research and Development Program of China [2018YFB2002600]
- Fundamental Research Funds for the Central Universities [3102019JC002]
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This paper outlines the design of a novel mode-localized electric current sensor based on a mechanically sensitive element of weakly coupled resonator systems. The sensor converts the test current to voltage through a silicon shunt resistor, causing a stiffness perturbation to one resonator. The mode-localization phenomenon alters the energy distribution, and the sensor has a sensitivity of 567/A, a noise floor of 69.3 nA/root Hz, a resolution of 183.6 nA, and a bias instability of 81.6 nA.
This paper outlines the design of a novel mode-localized electric current sensor based on a mechanically sensitive element of weakly coupled resonator systems. With the advantage of a high voltage sensitivity of weakly coupled resonator systems, the current under test is converted to voltage via a silicon shunt resistor, which causes stiffness perturbation to one resonator. The mode-localization phenomenon alters the energy distribution in the weakly coupled resonator system. A theoretical model of current sensing is established, and the performance of the current sensor is determined: the sensitivity of the electric current sensor is 567/A, the noise floor is 69.3 nA/root Hz, the resolution is 183.6 nA, and the bias instability is 81.6 nA. The mode-localized electric current sensor provides a new approach for measuring sub-microampere currents for applications in nuclear physics, including for photocurrent signals and transistor leakage currents. It could also become a key component of a portable mode-localized multimeter when combined with a mode-localized voltmeter. In addition, it has the potential for use in studying sensor arrays to achieve higher resolution.
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