论文部分内容阅读
本文讲的是一种速率积分单输入轴的核磁共振陀螺。它没有运动部分,因而具有很多优点,如极大的加速度容限,无反作用力矩。另外,此种陀螺能与大的输入速率和大的角度范围相适应。某些原子核具有本征角动量,因而也具有核磁偶极矩。核陀螺的传感元件就是包含这种原子核的低密度汞蒸汽。这个汞核集团就像许多微小而优良的陀螺,而这些小陀螺就相当于沿其自旋轴排列的条形小磁棒,它们与周围物质没有机械作用。当核集团相对于惯性空间转动时,由外部的仪器测出它的动态特性变化,即可提供出反映这一转动的传感数据。更具体地说,是当陀螺转动时,测量出在磁场中核磁矩进动的变化。使用~(199)Hg 和~(201)Hg 这两种不同的核,就可避免精确控制或了解外加磁场的问题。通过使原子核定向的光泵技术和对进动的光监控,只用1.2高斯的弱磁场便可获得信噪比大的核磁共振信号。本文还将叙述最近测试的一个试验模型的设备。由核磁共振控制振荡器输出信号之间的相位比较,可提供转动输出数据。最后,讨论了影响随机漂移率的设计因素和使用范围。
This article is about a rate-integral single-input NMR gyroscope. It has no moving parts and therefore has many advantages, such as great acceleration tolerance and no reaction torque. In addition, such a gyroscope can adapt to a large input speed and a large angle range. Some nuclei have intrinsic angular momentum and thus also have nuclear magnetic dipole moments. The sensing element of the nuclear gyroscope is a low-density mercury vapor containing this nucleus. The mercury group is like many fine, fine gyros, and these small gyroscopes are the equivalent of small bar-shaped bars arranged along their spin axes that have no mechanical effect on the surroundings. When the nuclear group rotates with respect to inertial space, the change of its dynamic characteristics is measured by an external instrument to provide sensor data reflecting this rotation. More specifically, as the gyroscope turns, changes in the nuclear magnetic moment precession in the magnetic field are measured. The use of two different nuclei of ~ (199) Hg and ~ (201) Hg avoids the problem of precisely controlling or understanding the applied magnetic field. By making the nuclear-oriented optical pumping technology and the prestaged light monitoring, a nuclear magnetic resonance signal with a large signal-to-noise ratio can be obtained using only 1.2 Gauss weak magnetic field. This article will also describe the equipment of a test model that was recently tested. The phase comparison between the output signals of the oscillator controlled by the NMR can provide rotational output data. Finally, the design factors that affect the random drift ratio and the application range are discussed.