Capability assessment and challenges for quantum technology gravity sensors for near surface terrestrial geophysical surveying
Capability assessment and challenges for quantum technology gravity sensors for near surface terrestrial geophysical surveying
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DOI：
10.1016/j.jappgeo.2017.09.018
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发表时间：
2017-11-01
影响因子：
2
通讯作者：
Tuckwell, George
中科院分区：
文献类型：
--
作者：
Boddice, Daniel;Metje, Nicole;Tuckwell, George
地球物理测量广泛用于地下特征的定位。目前的技术在分辨率（因此可以检测到的特征尺寸）和穿透深度方面受到限制，需要一种合适的技术来弥补浅层近地表调查与使用传统微重力（>类似于地表以下 5 m）可检测到的更大深度的大型特征之间的差距。这将最大限度地减少土木工程施工过程中埋藏的未知特征和地面状况带来的风险。量子技术 (QT) 重力传感器有可能为定位在尺寸和深度方面超出当前可检测范围的特征提供技术上的重大改变，但由于尚未开发出现场仪器，因此这种潜力目前尚不清楚。为了克服这个问题，针对大量不同的感兴趣目标开发了一种新颖的计算机模拟。模拟包括对仪器、环境和位置噪声源进行真实噪声建模，这些噪声源限制了当前微重力测量的准确性，以便评估新型 QT 仪器在现实情况下的潜在能力，并确定其实施中可能存在的一些限制。近地表特征的模拟结果表明，与当前仪器使用的传统单传感器重力计相比，新技术最适合在梯度计配置中使用，因为它能够抑制由于传感器之间的共模抑制而产生的振动环境噪声影响。探测能力显着提高了 1.5-2 倍，将矿井等目标置于可探测区域，这将是地下测量的主要优势。因此，这项研究首次清楚地证明了QT重力梯度仪传感器的优势，从而增强了业界对这项新技术的信心。 (C) 2017 年作者。由 Elsevier B.V. 出版
Geophysical surveying is widely used for the location of subsurface features. Current technology is limited in terms of its resolution (thus size of features it can detect) and penetration depth and a suitable technique is needed to bridge the gap between shallow near surface investigation using techniques such as EM conductivity mapping and GPR commonly used to map the upper 5 m below ground surface, and large features at greater depths detectable using conventional microgravity (>similar to 5 m below ground surface). This will minimise the risks from unknown features buried in and conditions of the ground during civil engineering work. Quantum technology (QT) gravity sensors potentially offer a step-change in technology for locating features which lie outside of the currently detectable range in terms of size and depth, but that potential is currently unknown as field instruments have not been developed. To overcome this, a novel computer simulation was developed for a large range of different targets of interest. The simulation included realistic noise modelling of instrumental, environmental and location sources of noise which limit the accuracy of current microgravity measurements, in order to assess the potential capability of the new QT instruments in realistic situations and determine some of the likely limitations on their implementation. The results of the simulations for near surface features showed that the new technology is best employed in a gradiometer configuration as opposed to the traditional single sensor gravimeter used by current instruments due to the ability to suppress vibrational environmental noise effects due to common mode rejection between the sensors. A significant improvement in detection capability of 1.5-2 times was observed, putting targets such as mineshafts into the detectability zone which would be a major advantage for subsurface surveying. Thus this research, for the first time, has demonstrated clearly the benefits of QT gravity gradiometer sensors thereby increasing industry's confidence in this new technology. (C) 2017 The Authors. Published by Elsevier B.V.