Development and model-based test of a SQUID-based high-resolution superconducting gravimeter (HR-1D-SG)

合作的共同研究目标是基于SQUID的超导重力仪，与最先进的仪器相比具有更高的分辨率。任务分配如下：PTB开发传感器单元样机，特别是高精度测试质量。IPHT耶拿公司集成了SQUID读出电路，开发了SQUID传感器，并为重力仪改造了SQUID电子设备。地球物理观测所将开发地球物理模型，并在艾草地球动力观测站（图林根）的重力仪设施测试原型传感器。该项目的主要任务是使用高灵敏度低温超导SQUID和优化的读出电路，将分辨率提高到商用加速度传感器的100倍（分辨率：地球重力的10-14分之一）。这种类型的传感器的潜力是解决非常低的地球动力学重力信号，以调查的性质的摇摆和Slichter-Triplet（如果存在）。为了评估与安装的重力仪相比的分辨率，必须开发靠近艾草观测站的质量传输的高精度模型。如果原型开发成功，则有必要开展后续项目，开发能够在三个正交方向测量重力的仪器原型，这对于目前的商业仪器来说是不可能的。这为地球物理学界开辟了一个新的数据世界。

Common research goal of the cooperation is a SQUID based superconducting gravimeter with a higher resolution compared to state of the art instruments. The role allocation is as follows: PTB develops the sensor unit prototype especially the high precision test mass. IPHT Jena incorporates the SQUID readout circuitry, develops the SQUID sensors and adapts the SQUID electronics for the gravimeter. IGW will develop the geophysical models and tests the prototype sensor at the gravimeter facility in the Geodynamic Observatory Moxa (Thuringia). The main task of the project is the enhancement of the resolution compared to commercial acceleration sensors by a factor of 100 (resolution: 10-14 part of the Earth’s gravity), using highly sensitive low temperature superconductivity SQUID and an optimized readout circuitry. Potential of this type of sensor is to resolve very low geodynamic gravity signals to investigate the properties of the Chandler-Wobble and the Slichter-Triplet (if existent). To evaluate the resolution in comparison to the installed gravimeter high accuracy models of mass transports close to the observatory in Moxa have to be developed. If case of success of the prototype development a follow up project is necessary to develop a prototype of an instrument capable to measure gravity in three orthogonal directions, which is not possible for the current commercial instruments. This opens up a new world of data for the geophysical community.