Moody M V
Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Rev Sci Instrum. 2011 Sep;82(9):094501. doi: 10.1063/1.3632114.
A gravity gradiometer designed for operation on an aircraft or ship has been tested in the laboratory. A noise level of 0.53 E (E ≡ 10(-9) s(-2)) rms over a 0.001 to 1 Hz bandwidth has been measured, and the primary error mechanisms have been analyzed and quantified. The design is a continuation in the development of superconducting accelerometer technology at the University of Maryland over more than three decades. A cryogenic instrument presents not only the benefit of reduced thermal noise, but also, the extraordinary stability of superconducting circuits and material properties at very low temperatures. This stability allows precise matching of scale factors and accurate rejection of dynamic errors. The design of the instrument incorporates a number of additional features that further enhance performance in a dynamically noisy environment.
一种设计用于在飞机或船舶上运行的重力梯度仪已在实验室中进行了测试。在0.001至1Hz带宽上测量到均方根噪声水平为0.53E（E≡10^(-9)s^(-2)），并且已对主要误差机制进行了分析和量化。该设计是马里兰大学三十多年来超导加速度计技术发展的延续。低温仪器不仅具有降低热噪声的优点，而且在极低温度下超导电路和材料特性具有非凡的稳定性。这种稳定性允许精确匹配比例因子并准确消除动态误差。该仪器的设计包含许多其他功能，可在动态噪声环境中进一步提高性能。
