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Experimental limits of an inertial sensor based on cold atoms interferometry

机译:基于冷原子干涉测量的惯性传感器的实验限制

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We investigate the limits of our cold atoms interferometer to rotation and acceleration measurements. In contrast with previous atomic setups, emphasis was placed on the long term stability and compactness of the device through the use of laser cooled atoms, as previously shown with the field of atomic clock. It has been designed to give access to all six axes of inertia (three accelerations and three rotations). The expected improvement in stability will enable to consider applications in inertial navigation, geophysics and tests of general relativity as the equivalence principle or Lense-Thirring effect. Cesium atoms are loaded as a vapor into two independent magneto-optical traps for 140 ms at 2 Hz repetition rate. The two cesium clouds are launched into two opposite parabolic trajectories using moving molasses at 2.4 m.s{sup}(-1), with an angle of 8° with respect to the vertical direction. At the top of their trajectory, the atoms interact with three Raman lasers pulses, equivalent to beam splitters (for π/2 pulses) and mirrors (for π pulses), thus generating an interferometer of 80 ms total interaction time. The use of two atomic sources allows to discriminate between the acceleration and rotation.
机译:我们研究了冷原子干涉仪的旋转和加速度测量的限制。与先前的原子设置相比,通过使用激光冷却原子,将重点放在装置的长期稳定性和紧凑性上,如原子钟的领域所示。它旨在提供对所有六个惯性轴(三个加速度和三个旋转)。稳定性的预期改善将能够考虑惯性导航,地球物理和一般相对性测试的应用,作为等价原则或致敏颤效应。将铯原子作为蒸汽作为蒸汽加载到两个独立的磁光阱中,以2 Hz重复率为140ms。使用在2.4米{sup}(-1)的移动糖蜜,两个铯云推动到两个相反的抛物面轨迹中,相对于垂直方向,角度为8°。在其轨迹的顶部,原子与三个拉曼激光脉冲相互作用,相当于束分离器(用于π/ 2脉冲)和镜子(用于π脉冲),从而产生80ms总交互时间的干涉仪。使用两个原子源允许区分加速度和旋转。

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