传感技术学报2018，Vol.31Issue(2)：170-174,5.DOI:10.3969/j.issn.1004-1699.2018.02.002
基于FPGA的光泵磁梯度仪频率测量方法
The Frequency Measurement Method for Cesium Optically Pumped Magnetic Gradiometer Based on FPGA
摘要
Abstract
Magnetic-gradient measurement can suppress the influence of the geomagnetic diurnal variation in the measurements to a great extent and thus has higher resolution than traditional total-field measurement. As a result,it has enormous potential in mineral prospecting,geophysics study,and military affairs. This paper introduces a FPGA-based magnetic-gradient measurement system using two Cs-3 optical pumps as magnetometers. The measured magnetic intensity of an optical pump is proportional to its output frequency,so in order to achieve a higher resolution and a stable sampling rate,we propose a frequency measurement method combining the digital interpolation method and the phase shift method.Experiments show that this new method has improved the frequency-measurement perform-ance in terms of accuracy and consistency. And it has also been proved that magnetic-gradient measurement is more accurate than total-field measurement and can provide clearer details of the anomaly,such as its size and position.关键词
频率测量/FPGA/磁梯度/光泵Key words
frequency measurement/FPGA/magnetic gradient/optical pump分类
信息技术与安全科学引用本文复制引用
窦子优,程德福,周志坚..基于FPGA的光泵磁梯度仪频率测量方法[J].传感技术学报,2018,31(2):170-174,5.基金项目
国家重大科研装备研制项目(ZDYZ2012-1-02) （ZDYZ2012-1-02）
