Proportion-integral-derivative (PID) closed-loop frequency-locking (CLFL) technology has been demonstrated to improve the magnetic field sensitivity of spin-based sensors based on the nitrogen-vacancy (NV) color centers in diamond. First, we analyse the undulation effect of the fluorescence quantum yield of NV centers with a magnetic field. The valley value of the magnetic resonance spectrum have been differential into a zero to insensitive to intensity fluctuations of fluorescence quantum yield of NV centers based on the PID-CLFL technology. Then, the sensitivity of the magnetic field improved from 40 nT Hz −1/2 to 10 nT Hz −1/2 . It proves an effective method to improve the sensitivity of the spin-based sensors.

中文翻译：

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一种提高磁强计精度和灵敏度的比例积分微分闭环锁频方法

比例积分微分（PID）闭环锁频（CLFL）技术已被证明可以改善基于金刚石中氮空位（NV）颜色中心的自旋传感器的磁场灵敏度。首先，我们分析了具有磁场的NV中心的荧光量子产率的起伏效应。基于PID-CLFL技术，磁共振波谱的谷值已微分为零，从而对NV中心的荧光量子产率的强度波动不敏感。然后，磁场的灵敏度从40 nT Hz -1/2提高到10 nT Hz -1/2。它证明了一种提高自旋传感器灵敏度的有效方法。