The investigation of a μGal-level cold atom gravimeter for field applications
The investigation of a μGal-level cold atom gravimeter for field applications
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μGal级冷原子重力仪现场应用研究
DOI：
10.1088/0026-1394/51/5/452
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发表时间：
2014-10-01
期刊：
影响因子：
2.4
通讯作者：
Lin, Qiang
中科院分区：
文献类型：
--
作者：
Wu, Bin;Wang, Zhaoying;Lin, Qiang
典型的原子重力仪都有很强的磁屏蔽来避免二次塞曼效应，同时也有复杂的主动隔振系统来抑制振动噪声。这两种情况都给研制移动的小型重力仪带来了困难。在本文中，我们提出了一个原子重力仪的实现针对现场应用。我们的重力仪使用改进的磁线圈代替昂贵的磁屏蔽高导磁合金。二次塞曼位移的评估具有很高的精度。此外，一个相对较小的便携式平台的振动隔离。总询问时间优化为120 ms，重复率为2.2 Hz。在1000 s积分时间内，灵敏度达到1.0 × 10 - 7 g Hz-1/2，分辨率达到5.7 × 10 - 9 g。进行超过128小时的连续g测量。此外，我们的原子重力仪记录了2013年9月28日在巴基斯坦发生的约1小时的整个地震波。其结果与传统地震检波器记录的结果吻合得很好。
Typical atomic gravimeters have a heavy magnetic shielding to avoid the quadratic Zeeman effect, and also a complicated active vibration isolation system to suppress the vibration noise. Both of them make it difficult to build a mobile and compact gravimeter. In this paper, we present the implementation of an atomic gravimeter aiming at field applications. Our gravimeter uses improved magnetic coils instead of the expensive mu-metal for magnetic shielding. The quadratic Zeeman shift is evaluated with high accuracy. Moreover, a portable platform of relatively small size is applied for vibration isolation. The total interrogation time is optimized to 120 ms and the repetition rate is 2.2 Hz. A sensitivity of 1.0 × 10−7 g Hz−1/2 and a resolution of 5.7 × 10−9 g within 1000 s integration time are reached. A continuous g measurement over 128 h is carried out. Moreover, a whole seismic wave of about 1 h that occurred in Pakistan on 28 September 2013 is recorded by our atomic gravimeter. The results coincide with that recorded by a traditional seismic detector very well.