A sensor system includes a body, which includes an outer wall defining an inner opening centered about an axis, and radiating structures disposed in the opening and extending radially from the axis to the outer wall. The radiating structures are spaced circumferentially around the axis by a substantially equal angle. The system includes sensors that generate signals in response to deformations of the radiating structures. The signals provide vectors corresponding to the deformations. The deformations are caused by: (i) a torque about the axis, and (ii) a secondary torque or force. The system includes a controller electrically coupled to the sensors and configured to determine, by combining the vectors provided by the signals, a measurement of the torque about the axis. The sensors are arranged on the radiating structures such that combining the vectors substantially eliminates any effect of the secondary torque or force from the measurement.