环形激光弱磁传感器误差分析

本文从理论上分析了环形激光弱磁传感器主要误差因素并提出了若干克服这些因素的方法。这些误差因素是:大尺寸的法拉第室引入的噪声,磁光材料的费尔德常数的温度系数,塞曼效应的混入、朗谬尔效应等。

Error analysis for a ring-laser weak magnetic field sensor

The main errors of a ring-laser weak magnetic field sensor are analysed and the methods to eliminate these errors are discussed. The error introduced by temperature coeffient of verdet constant of magneto-optical materials is derived theoretically. This is the main source of error due to temperature coefficient of a ring-laser weak magnetic field sensor after low expansion cavity materials and frequency stabitization technique have been used. The error introduced by Zeeman effect is given. The Zeeman effect error results from the magnetic field sensitivity of the gain medium, and it is mixed with the magnetic field sensitivity of the Faraday magnetic-optical material. By locating a gain tube in each longer arm of the rectangular cavity, the Zeeman effect can be avoided. The two gain tubes have the same parameters (such as core length, diameter, total and partial presure, discharge current, and diamension of cathod). The influence of Langmuir gas flow effect can be etimination by beating positive and negative rotations and then adding the beats of right and ligt rotations.