A portable frequency-domain electromagnetic detection system

Frequency-domain detection stands as a critical method in remote geophysical exploration; however, its practical application is constrained by the considerable size of the requisite instrumentation. In this paper, we present a compact frequency domain electromagnetic detection system. The integration of intelligent power devices and a novel hardware architecture substantially diminishes the system's dimensions, thereby enhancing its portability. Furthermore, the system design incorporates sinusoidal pulse width modulation and digital phase-locked amplification to ensure the efficacy of the proposed system. Both the transmitter and receiver system are constrained to dimensions smaller than 1.5 m. Subsequent experimental validation attests to the exemplary hardware performance of the proposed system, with the transmitting voltage of the transmitter circuit attaining 500 V, and the receiver circuit exhibiting a sensitivity as low as 10-8 V. Significantly, this design paradigm not only facilitates the integration of transmitter and receiver systems for frequency-domain electromagnetic detection but also introduces novel prospects for the application of frequency-domain electromagnetic detection methods across diverse fields. Frequency-domain electromagnetic method is an important geophysical exploration method, but its application scenario is currently limited by the size of the instrument. In this paper, we propose a portable frequency-domain electromagnetic system, which allows the method to have more opportunities to be applied in a variety of scenarios.image