Contact sports such as ice hockey expose athletes to a considerable risk of concussions, emphasizing the importance of reliable tools for head impact monitoring. To address this challenge, a smart helmet was developed, embedding inertial measurement units (IMUs) at three distinct locations on the outer shell. Experimental tests were carried out in a controlled laboratory environment, where a pendulum impactor was used to deliver standardized impacts to a dummy's head according to a predefined protocol. An additional IMU, placed inside the headform, served as the reference system. Each sensor recorded both linear accelerations and angular velocities along the three spatial axes, and the measurements collected from the helmet-mounted IMUs were systematically compared against the reference IMU.