Write a PREreview

Mapping low‑intensity magnetic fields is critical across diverse domains, including material and device characterization, neuroscience and biomedical sensing, wearable technologies, geophysics, space exploration, robotics and more recently diagnostics and safety monitoring in energy storage systems. In this work, we present a 4×4 array of commercially available, high‑sensitivity magnetic field sensors. Following calibration of the sensor outputs, the array was employed to characterize the magnetic field produced by two planar copper conductors. Experimental measurements showed strong agreement with finite element simulations, thereby validating the performance of the array. As a preliminary application, the system was used to map the magnetic field distribution of pouch‑type lithium‑polymer batteries, demonstrating its potential for noninvasive diagnostics in battery systems.