Scientists have developed a miniature high-precision integrated diamond quantum current sensor

The rapid development of emerging industrial applications such as electric vehicles, smart grids, and high-speed trains has put forward higher requirements for high-precision current sensors. Compared with traditional current sensors, sensing devices based on quantum effects can use quantum state manipulation technology to improve the accuracy of measurement. These advantages make current sensors based on quantum effects have a wide range of application prospects in various applications.

Recently, the State Key Laboratory of Sensing Technology, Shanghai Institute of Microsystems and Information Technology, Chinese Academy of Sciences, prepared a miniature photoelectric integrated integrated diamond quantum current sensor based on nitrogen-vacancy (NV) quantum color center. The research results are titled Millimeter-Scale Temperature Self-Calibrated Diamond-Based Quantum Sensor for High-Precision Current Sensing, published in Advanced Quantum Technologies.

The research developed an integrated diamond sensor. The core elements of this sensor are millimeter-sized and are achieved by standard micromachining processes. Microfabrication-compatible optical introduction and fluorescence collection structures with 66% photon detection efficiency, a minimum detection limit of 2 mA over a 0–400 A measurement range, and effective use of dual spin resonance modulation to reduce temperature drift to 1.92 ppm°C-1 improve sensor stability and reliability, solving the constraints of insufficient integration from research to application. This achievement provides a robust and scalable platform for current quantum sensing technology, which has good application prospects in many key fields such as electric vehicles and smart grids.

Shanghai Microsystems Institute has developed a miniature high-precision integrated diamond quantum current sensor

The research work is supported by the National Key R&D Program and the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences. (Source: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

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