中文摘要：

在 nanoscale 分辨率并且在房间温度的弱磁场的测量总是是一个重要话题在生物，物理，并且材料科学。如此的察觉能被用来决定样品的描述，例如房间，材料等等。在钻石的氮空缺(NV ) 中心被证明了能在房间温度与 nano 泰斯拉敏感和纳米分辨率检测一个磁场。这里，我们试验性地证明一个优化 NV 中心在一颗商业钻石并且在造家的光学地检测的磁性的回声(ODMR ) 下面基于单个电子磁强计显微镜。与当前的技术，我们改变光学地检测的时间窗户得到一个更好的信号到噪音比率，并且使用动态去耦增加磁场振幅对荧光信号的斜坡。由采用 8 脉搏 XY-4 动态去耦顺序我们完成 18.9 nT/$\sqrt 的敏感 { Hz }$ ，它比纺纱好 1.7 倍回响。我们也建议一个 NV 中心基于象 nanoscale 一样为电子和原子旋转察觉扫描钻石显微镜磁性的回声成像。如果它被认识到， NV 中心基于 magnetometry 以后将有宽申请。

英文摘要：

The measurement of the weak magnetic field in nanoscale resolution and at room temperature is always a significant topic in bio- logical, physical, and material science. Such detection can be used to decide the characterization of the samples, such as cells, materials, and so on. Nitrogen-vacancy （NV） center in diamond has been proved to be able to detect a magnetic field with nano Tesla sensitivity and nanometer resolution at room temperature. Here we experimentally demonstrate an optimized NV center based single electron magnetometer in a commercial diamond and under a home-built optically detected magnetic resonance （ODMR） microscope. With current technology, we change the optically detected time window to get a better signal to noise ratio, and use dynamical decoupling to increase the slope of magnetic field amplitude versus fluorescence signal. By employing the 8-pulse XY-4 dynamical decoupling sequence we achieve a sensitivity of 18.9 nT√/z, which is 1.7 times better than spin echo We also propose a NV center based scanning diamond microscope for electron and nuclear spins detection as well as nanoscale magnetic resonance imaging. If it is realized, the NV center based magnetometry will have wide application in the future.