知识与财富的链接
原子干涉陀螺仪是一种实现高精度角速率测量的新型惯性器件,被认为是下一代导航技术中的核心器件。报道了在连续冷原子束干涉陀螺仪研究上的最新进展。提出了基于连续冷原子束的干涉陀螺仪方案,该方案在保证系统灵敏度和紧凑型的前提下有助于解决冷原子干涉陀螺仪低带宽和数据率的问题。利用激光冷却的~(87) Rb冷原子束作为原子光源,利用多普勒敏感的双光子受激拉曼跃迁进行原子波包的相干操控,演示了π/2-π-π/2拉曼脉冲序列的空间型原子干涉。数据估算原子干涉陀螺的短期灵敏度为7.8×10~(-5)(rad/s)/Hz~(1/2)(1s积分时间),其中干涉条纹的信噪比为15.1,系统带宽为190Hz,系统理论带宽可以达到790Hz。
As one of novel technologies for high precision rotation sensing, atom interferometer gyroscopes have been considered as one of candidates for core devices in the application of the next generation inertial navigation. Recent progress in our atom interferometer gyroscope based on a continuous cold atomic beam is reported. Using a low-velocity continuous atomic source in an atom interferometer gyroscope enables high sampling rates and bandwidths without sacrificing sensitivity and compactness, which are important for applications in real dynamic environments. We demonstrate an π/2- π- π/2 Raman pulse sequence atom interferometer that uses a laser-cooled continuous beam of 87Rb atoms as atom source and coherently manipulates the atomic wave packets through stimulated Raman transition of Doppler sensitive two-photon. The apparatus operates at a bandwidth of 190Hz with a deduced sensitivity of 7.8×10-5(rad/s)/Hz for rotations and a system theoretical bandwidth of 970Hz. And the SNR of its interference fringes is 15.1
