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| DDS-based intelligent modulation of the radio frequency field of helium optically pumped magnetometers |
DENG Xiao-Dan1,2( ), LI Xue-Yan1,2(), ZHOU Xi-Hua1,2, DUAN Le-Ying1,2, HE Hui1,2 |
1. Key Laboratory of Airborne Geophysics and Remote Sensing Geology, MNR, Beijing 100083, China
2. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China |
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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.
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Received: 26 May 2022
Published: 27 April 2023
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Structure diagram of helium optical pump magnetometer probe
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Overall design block diagram
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Schematic diagram of connection between STM32 and AD9854
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Schematic diagram of circuit connection of AD9854
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Schematic diagram of demodulation circuit connection
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System flow chart
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Diagram of frequency sweep signal output waveform and spectrum analysis
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Demodulate waveform of modulating signal (left: center frequency 1 MHz; right: center frequency 2.8 MHz)
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Magnetic resonance signal of single modulation (a) and continuous modulation (b)
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