This work presents simulations, modelling, and experimental verification of a novel steady-state surface nuclear magnetic resonance (NMR) transmitter used for the non-invasive exploration of groundwater. The paper focuses on three main aspects of high-current transmitter instrumentation: thermal management, current-drooping, and pulse stability. This work will interest readers involved in geoscientific instrument prototyping for groundwater exploration using portable geoscientific instruments.

In the field of marine controlled-source electromagnetic (MCSEM) systems, the evident issue of heating caused by the demand for high power was observed during previous marine experiments, where devices and cables were damaged due to overheating. Therefore, the idea was conceived to design a non-contact temperature measurement system tailored specifically to MCSEM systems, with the capacity to seamlessly adapt to the existing hardware conditions at sea.

The Modular Aquatic Robotic Platform–Freiberg (MARP-FG) is an autonomous catamaran designed to improve water monitoring by reducing human-related biases. It supports customizable sensors for water profiling, 3D basin mapping, and greenhouse gas flux measurements. Tested in Amazonian and European waters, MARP-FG showed precise navigation and reliable data collection under challenging weather, enhancing long-term, automated aquatic ecosystem monitoring.