基于DDS的氦光泵磁力仪射频场智能调频研究

doi:10.11720/wtyht.2023.1261

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摘要

地磁场测量在基础地质研究、矿产资源勘查和军事探测等领域得到广泛应用,作为磁场测量核心之一的氦光泵磁力仪探头,其射频场调频精度是决定其磁测精度的重要影响因素。为实现易调节、高精度、高可靠性的调频信号,本文利用直接数字频率合成器(DDS)与微控制器(MCU)相结合方式,研究了磁力仪探头射频场智能精密调频技术,可灵活、实时、自动、精密地对磁力仪探头射频场进行调频。调频信号加载到氦光泵磁力仪系统的联调试验表明,磁力仪获得了稳定精密的磁共振信号,从而保证了磁力仪实现高精度的磁场测量。

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	邓肖丹
	李学砚
	周锡华
	段乐颖
	何辉

关键词 ：直接数字频率合成, 氦光泵磁力仪, 调频

Abstract：

Geomagnetic field surveys have been widely applied in the fields such as basic geological study, mineral resource exploration, and military detection. A key tool for geomagnetic field surveys is helium optically pumped magnetometer probes. The frequency modulation precision of the radio frequency field used in the probes is an important factor affecting geomagnetic survey precision. To achieve frequency modulation signals featuring easy modulation, high precision, and high reliability, this study proposed an intelligent frequency modulation technology for the radio frequency field of the magnetometer probes by combining the direct digital frequency synthesizer (DDS) and the microcontroller unit (MCU). This technology can achieve flexible, real-time, automatic, and precise frequency modulation of the radio frequency field of the magnetometer probes. As revealed by the integration tests in which frequency modulation signals were loaded into the helium optically pumped magnetometer system, the magnetometer can obtain stable and precise magnetic resonance signals, thus ensuring high-precision geomagnetic field surveys.

Key words： direct digital frequency synthesis helium optically pumped magnetometer frequency modulation

收稿日期: 2022-05-26 修回日期: 2022-09-06 出版日期: 2023-04-20

ZTFLH:

P631

基金资助:中国自然资源航空物探遥感中心青年创新基金(2020YFL01);国家重点研发计划专项课题“航空重磁综合观测系统集成与飞行验证”(2021YFB3900205)

通讯作者: 李学砚(1984-),男,高级工程师,研究生,主要研究领域为光电传感器与航磁仪器研发工作。Email:leexy2604911@163.com

引用本文:

邓肖丹, 李学砚, 周锡华, 段乐颖, 何辉. 基于DDS的氦光泵磁力仪射频场智能调频研究[J]. 物探与化探, 2023, 47(2): 464-469.
DENG Xiao-Dan, LI Xue-Yan, ZHOU Xi-Hua, DUAN Le-Ying, HE Hui. DDS-based intelligent modulation of the radio frequency field of helium optically pumped magnetometers. Geophysical and Geochemical Exploration, 2023, 47(2): 464-469.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1261 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I2/464

Fig.1 氦光泵磁力仪探头结构示意

Fig.2 总体设计框

Fig.3 STM32与AD9854连接示意

Fig.4 AD9854电路连接示意

Fig.5 解调电路连接示意

Fig.6 系统程序流程

Fig.7 扫频信号输出波形与频谱分析

Fig.8 调制信号解调波形(左:中心频率1 MHz;右:中心频率2.8 MHz)

Fig.9 单调频(a)、连续调频(b)磁共振信号

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